Deciphering the mystery behind your Jeep Compass’s check engine light can be daunting. When that light illuminates on your dashboard, it’s often accompanied by a sense of unease and questions. What’s wrong with my vehicle? Is it serious? How much will it cost to fix? Fortunately, modern vehicles like the Jeep Compass are equipped with an On-Board Diagnostics system, specifically OBD2, which helps pinpoint potential problems. This system generates codes that can be read with a scanner, providing valuable insights into your vehicle’s health.
This comprehensive guide is designed to help Jeep Compass owners understand OBD2 codes. We’ll break down a range of codes, offering explanations to empower you with knowledge about your vehicle’s diagnostic system. While this guide is not a substitute for professional diagnosis, understanding these codes is the first step in ensuring your Jeep Compass runs smoothly and efficiently.
Understanding OBD2 Systems in Your Jeep Compass
The OBD2 system is a standardized system used in most vehicles manufactured after 1996. It monitors various systems within your Jeep Compass, from the engine and transmission to emissions control. When the system detects an issue outside of normal parameters, it triggers the check engine light and stores a Diagnostic Trouble Code (DTC). These DTCs are what we commonly refer to as OBD2 codes.
Retrieving these codes requires an OBD2 scanner, which can be plugged into the diagnostic port typically located under the dashboard on the driver’s side of your Jeep Compass. Once connected, the scanner reads the stored codes, giving you a starting point for diagnosing the problem.
Let’s delve into some common OBD2 codes relevant to Jeep vehicles, including the Jeep Compass, based on engine types and model years, as originally outlined:
OBD2 Codes for Carbureted Engines (Note: Carbureted engines are not typical in modern Jeep Compass models but included for broader historical context)
While modern Jeep Compass vehicles utilize fuel injection, understanding codes from older carbureted systems can provide a foundational knowledge of diagnostic principles.
- CODE 12: No distributor reference pulses to the ECM.
- Meaning: The Engine Control Module (ECM) is not receiving a signal from the distributor, which is crucial for ignition timing.
- Potential Jeep Compass Context (Less likely): In a carbureted system (less relevant to modern Compass), this could indicate a problem with the distributor itself, wiring issues, or a faulty ECM. This code is normal when the ignition is on but the engine isn’t running.
- CODE 13: Oxygen sensor circuit.
- Meaning: Indicates a problem in the oxygen sensor circuit, which monitors the oxygen levels in the exhaust to ensure proper fuel mixture.
- Potential Jeep Compass Context: Even in older systems, oxygen sensors are vital for fuel efficiency and emissions. A fault here could mean a failing O2 sensor, wiring problems, or issues with the ECM’s ability to read the sensor. The engine needs to run for a period before this code sets.
- CODE 14: Shorted coolant sensor circuit.
- Meaning: The coolant temperature sensor circuit is shorted, indicating an incorrect temperature reading.
- Potential Jeep Compass Context: Crucial for engine management and preventing overheating. A short can lead to inaccurate readings, potentially causing the engine to run poorly or overheat.
- CODE 15: Open coolant sensor circuit.
- Meaning: The coolant temperature sensor circuit is open, also indicating an incorrect temperature reading.
- Potential Jeep Compass Context: Similar to Code 14, but an open circuit can also result in incorrect readings, affecting engine performance and potentially leading to overheating.
- CODE 21: Throttle position sensor circuit.
- Meaning: Problem with the throttle position sensor (TPS) circuit, which tells the ECM the throttle valve’s position.
- Potential Jeep Compass Context: The TPS is essential for proper acceleration and idle control. A fault can cause rough idling, hesitation, or poor acceleration.
- CODE 23: Mixture control solenoid circuit is shorted or open.
- Meaning: Issue with the mixture control solenoid, which regulates fuel mixture in carbureted systems.
- Potential Jeep Compass Context (Less Likely): In older carbureted systems, this solenoid is crucial for fuel management. A fault can lead to rich or lean fuel conditions.
- CODE 34: Vacuum sensor circuit.
- Meaning: Problem with the vacuum sensor circuit, used to measure manifold vacuum, an indicator of engine load.
- Potential Jeep Compass Context (Less Likely): Vacuum sensors were used in older systems to help determine engine load. A fault can affect fuel delivery and ignition timing.
- CODE 41: No distributor reference pulses to the ECM at the specified engine manifold vacuum.
- Meaning: Similar to Code 12, but specifically under vacuum conditions, suggesting a load-related distributor issue.
- Potential Jeep Compass Context (Less Likely): Indicates a potential issue with the distributor signal under engine load conditions in older systems.
- CODE 42: Electronic Spark Timing (EST) bypass circuit or EST circuit has short circuit to ground or an open circuit.
- Meaning: Problem in the Electronic Spark Timing system, which controls ignition timing electronically.
- Potential Jeep Compass Context (Less Likely): Relates to ignition timing control in older systems. Faults here can cause poor engine performance and reduced fuel efficiency.
- CODE 44: Lean exhaust indication.
- Meaning: The oxygen sensor is detecting a lean condition, meaning too much oxygen and not enough fuel in the exhaust.
- Potential Jeep Compass Context: A lean condition can be caused by vacuum leaks, fuel delivery problems (like a weak fuel pump or clogged injectors), or a faulty oxygen sensor.
- CODE 44 & 45: If these two codes appear at the same time, it indicates a problem in the oxygen sensor circuit.
- Meaning: Simultaneous lean and rich codes usually point directly to an oxygen sensor malfunction.
- Potential Jeep Compass Context: Highlights a likely fault with the oxygen sensor itself or its wiring.
- CODE 45: Rich exhaust indication.
- Meaning: The oxygen sensor is detecting a rich condition, meaning too much fuel and not enough oxygen in the exhaust.
- Potential Jeep Compass Context: A rich condition can be caused by fuel pressure regulator issues, leaking injectors, or a faulty oxygen sensor.
- CODE 51: Faulty calibration unit (PROM) or installation.
- Meaning: Problem with the Programmable Read-Only Memory (PROM) chip in the ECM, which stores calibration data.
- Potential Jeep Compass Context (Less Likely): Indicates a potential ECM issue, possibly requiring reprogramming or replacement in older systems.
- CODE 54: Mixture Control (MC) solenoid circuit is shorted or the ECM is faulty.
- Meaning: Similar to Code 23, but also suggests the ECM itself might be the problem.
- Potential Jeep Compass Context (Less Likely): Points to a mixture control solenoid issue or a more serious ECM failure in older systems.
- CODE 55: Voltage reference has short circuit to ground (terminal 21), faulty oxygen sensor or faulty ECM.
- Meaning: Problem with the voltage reference circuit, often impacting sensors, or indicates a faulty oxygen sensor or ECM.
- Potential Jeep Compass Context: A more general electrical issue that could affect sensor readings or point to a failing ECM.
OBD2 Codes for Fuel Injected Engines (Except 1991 and Later Models – Again, context for older systems, modern Compass is fuel injected)
Moving into fuel-injected systems, which are more relevant to the Jeep Compass, these codes become more directly applicable, especially for older models.
- Code 1000-Ignition line low.
- Meaning: Low voltage detected in the ignition line.
- Potential Jeep Compass Context: Could indicate wiring issues, a failing ignition switch, or problems with the power supply to the ignition system.
- Code 1001-Ignition line high.
- Meaning: High voltage detected in the ignition line.
- Potential Jeep Compass Context: Could suggest voltage regulator issues or shorts in the wiring causing excessive voltage.
- Code 1002-Oxygen heater line.
- Meaning: Problem with the oxygen sensor heater circuit.
- Potential Jeep Compass Context: Oxygen sensors often have heaters to bring them up to operating temperature quickly. A fault here can affect sensor accuracy and efficiency, impacting emissions and fuel economy.
- Code 1004-Battery voltage low.
- Meaning: Low battery voltage detected.
- Potential Jeep Compass Context: Could be due to a weak battery, charging system problems (alternator), or excessive electrical drain.
- Code 1005-Sensor ground line out of limits.
- Meaning: Problem with the sensor ground circuit, which is crucial for accurate sensor readings.
- Potential Jeep Compass Context: A faulty ground can cause a wide range of sensor issues, leading to incorrect readings and various performance problems.
- Code 1010-Diagnostic enable line low.
- Meaning: Low voltage on the diagnostic enable line.
- Potential Jeep Compass Context: May indicate issues with the diagnostic system itself or wiring problems affecting communication with the diagnostic tools.
- Code 1011-Diagnostic enable line high.
- Meaning: High voltage on the diagnostic enable line.
- Potential Jeep Compass Context: Similar to 1010, but high voltage could point to different wiring faults or ECM issues affecting diagnostics.
- Code 1012-MAP line low.
- Meaning: Low voltage from the Manifold Absolute Pressure (MAP) sensor circuit.
- Potential Jeep Compass Context: The MAP sensor measures manifold pressure, crucial for fuel and ignition timing. A low signal could be due to sensor failure, vacuum leaks, or wiring problems.
- Code 1013-MAP line high.
- Meaning: High voltage from the MAP sensor circuit.
- Potential Jeep Compass Context: Could be a faulty MAP sensor, wiring issues, or ECM problems causing an incorrect high reading.
- Code 1014-Fuel pump line low.
- Meaning: Low voltage in the fuel pump circuit.
- Potential Jeep Compass Context: Could indicate fuel pump relay issues, wiring problems, or a failing fuel pump not receiving enough power.
- Code 1015-Fuel pump line high.
- Meaning: High voltage in the fuel pump circuit.
- Potential Jeep Compass Context: Could be voltage regulator issues or wiring faults causing excessive voltage to the fuel pump.
- Code 1016-Charge air temperature sensor low.
- Meaning: Low reading from the charge air temperature sensor (for turbocharged models, if applicable).
- Potential Jeep Compass Context (Turbocharged models): Measures the temperature of air entering the engine after the turbocharger/intercooler. Incorrect readings can affect fuel and timing calculations.
- Code 1017-Charge air temperature sensor high.
- Meaning: High reading from the charge air temperature sensor.
- Potential Jeep Compass Context (Turbocharged models): Similar to 1016, but a high reading could indicate a sensor fault or wiring issues.
- Code 1018-No serial data from the ECU.
- Meaning: No communication from the Engine Control Unit (ECU).
- Potential Jeep Compass Context: A serious issue indicating a potential ECU failure, wiring problems, or communication bus issues.
- Code 1021-Engine failed to start due to mechanical, fuel, or ignition problem.
- Meaning: General code indicating a no-start condition.
- Potential Jeep Compass Context: Requires further diagnosis to pinpoint whether the issue is fuel-related (pump, injectors), ignition-related (spark plugs, coils), or mechanical (compression, timing).
- Code 1022-Start line low.
- Meaning: Low voltage in the starter circuit.
- Potential Jeep Compass Context: Could be starter relay issues, wiring problems, or a failing starter motor.
- Code 1024-ECU does not see start signal.
- Meaning: The ECU is not receiving a signal when the engine is being cranked.
- Potential Jeep Compass Context: Could be ignition switch problems, wiring issues, or a faulty crank position sensor.
- Code 1025-Wide open throttle circuit low.
- Meaning: Low voltage in the wide-open throttle (WOT) circuit.
- Potential Jeep Compass Context: Relates to the throttle position sensor and its signal at wide-open throttle.
- Code 1027-ECU sees wide open throttle.
- Meaning: The ECU is incorrectly registering a wide-open throttle condition.
- Potential Jeep Compass Context: Could be a faulty TPS sensor or wiring issues causing an incorrect signal.
- Code 1028-ECU does not see wide open throttle.
- Meaning: The ECU is not registering wide-open throttle when it should.
- Potential Jeep Compass Context: Could be a TPS sensor issue, wiring problems, or throttle linkage issues preventing full throttle.
- Code 1031-ECU sees closed throttle.
- Meaning: The ECU is incorrectly registering a closed throttle position.
- Potential Jeep Compass Context: Faulty TPS or wiring causing an incorrect closed throttle signal.
- Code 1032-ECU does not see closed throttle.
- Meaning: The ECU is not registering a closed throttle position when it should.
- Potential Jeep Compass Context: TPS sensor issue, wiring, or throttle linkage preventing proper closed throttle reading.
- Code 1033-Idle speed increase line low.
- Meaning: Low voltage in the idle speed increase circuit (for idle control systems).
- Potential Jeep Compass Context: Relates to idle control, could be issues with the idle air control valve or its wiring.
- Code 1034-Idle speed increase line high.
- Meaning: High voltage in the idle speed increase circuit.
- Potential Jeep Compass Context: Similar to 1033, but high voltage could indicate different wiring faults or idle control system issues.
- Code 1035-Idle speed decrease line low.
- Meaning: Low voltage in the idle speed decrease circuit.
- Potential Jeep Compass Context: Related to idle control, potentially issues with the idle air control valve or wiring.
- Code 1036-Idle speed decrease line high.
- Meaning: High voltage in the idle speed decrease circuit.
- Potential Jeep Compass Context: Similar to 1035, but high voltage could point to different wiring or idle control problems.
- Code 1037-Throttle position sensor reads low.
- Meaning: Low voltage reading from the throttle position sensor.
- Potential Jeep Compass Context: Faulty TPS sensor or wiring causing a low voltage signal.
- Code 1038-Park/Neutral line high.
- Meaning: High voltage in the Park/Neutral switch circuit.
- Potential Jeep Compass Context: Indicates issues with the Park/Neutral switch, which is important for starting and transmission operation.
- Code 1040-Latched B+ line low.
- Meaning: Low voltage in the “Latched B+” circuit, which provides constant battery voltage to the ECM.
- Potential Jeep Compass Context: Could be wiring issues or problems with the power supply to the ECM.
- Code 1041-Latched B+ line high.
- Meaning: High voltage in the “Latched B+” circuit.
- Potential Jeep Compass Context: Similar to 1040, but high voltage could indicate different wiring faults.
- Code 1042-No Latched B+ 1/2 volt drop.
- Meaning: Expected voltage drop in the Latched B+ circuit is not detected.
- Potential Jeep Compass Context: Suggests issues with the voltage supply or monitoring of the Latched B+ circuit.
- Code 1047-Wrong ECU.
- Meaning: Incorrect Engine Control Unit installed.
- Potential Jeep Compass Context: Could occur after an ECU replacement if the wrong part was installed.
- Code 1048-Manual vehicle equipped with automatic ECU.
- Meaning: An ECU designed for an automatic transmission is installed in a manual transmission vehicle.
- Potential Jeep Compass Context: Incorrect ECU installation, likely after a replacement.
- Code 1049-Automatic vehicle equipped with manual ECU.
- Meaning: An ECU designed for a manual transmission is installed in an automatic transmission vehicle.
- Potential Jeep Compass Context: Incorrect ECU installation, likely after a replacement.
- Code 1050-Idle RPM’s less than 500.
- Meaning: Engine idle speed is too low.
- Potential Jeep Compass Context: Could be idle air control valve issues, vacuum leaks, or engine mechanical problems causing low idle.
- Code 1051-Idle RPM’s greater than 2000.
- Meaning: Engine idle speed is too high.
- Potential Jeep Compass Context: Vacuum leaks, idle air control valve issues, or throttle linkage problems causing high idle.
- Code 1052-MAP sensor out of limits.
- Meaning: MAP sensor reading is outside of the acceptable range.
- Potential Jeep Compass Context: Faulty MAP sensor, vacuum leaks, or wiring problems affecting MAP sensor readings.
- Code 1053-Change in MAP reading out of limits.
- Meaning: The rate of change in MAP sensor reading is abnormal.
- Potential Jeep Compass Context: Could indicate a rapidly fluctuating vacuum condition, possibly due to vacuum leaks or engine problems.
- Code 1054-Coolant temperature sensor line low.
- Meaning: Low voltage from the coolant temperature sensor circuit.
- Potential Jeep Compass Context: Faulty coolant temperature sensor or wiring issues causing a low reading.
- Code 1055-Coolant temperature sensor line high.
- Meaning: High voltage from the coolant temperature sensor circuit.
- Potential Jeep Compass Context: Faulty coolant temperature sensor or wiring issues causing a high reading.
- Code 1056-Inactive coolant temperature sensor.
- Meaning: No change in coolant temperature sensor reading detected.
- Potential Jeep Compass Context: Faulty coolant temperature sensor or wiring preventing the sensor from registering temperature changes.
- Code 1057-Knock circuit shorted.
- Meaning: Short circuit in the knock sensor circuit.
- Potential Jeep Compass Context: Knock sensors detect engine knocking. A short circuit can disable the knock sensor system.
- Code 1058-Knock value out of limits.
- Meaning: Knock sensor reading is outside of the acceptable range.
- Potential Jeep Compass Context: Could indicate actual engine knocking, a faulty knock sensor, or wiring issues.
- Code 1059-A/C request line low.
- Meaning: Low voltage in the A/C request line.
- Potential Jeep Compass Context: Relates to the air conditioning system request signal.
- Code 1060-A/C request line high.
- Meaning: High voltage in the A/C request line.
- Potential Jeep Compass Context: Related to the air conditioning system request signal.
- Code 1061-A/C select line low.
- Meaning: Low voltage in the A/C select line.
- Potential Jeep Compass Context: Relates to the air conditioning system select signal.
- Code 1062-A/C select line high.
- Meaning: High voltage in the A/C select line.
- Potential Jeep Compass Context: Related to the air conditioning system select signal.
- Code 1063-A/C clutch line low.
- Meaning: Low voltage in the A/C clutch circuit.
- Potential Jeep Compass Context: Could be issues with the A/C clutch relay or wiring preventing the A/C clutch from engaging.
- Code 1064-A/C clutch line high.
- Meaning: High voltage in the A/C clutch circuit.
- Potential Jeep Compass Context: Could be wiring faults causing constant voltage to the A/C clutch.
- Code 1065-Oxygen reads rich.
- Meaning: Oxygen sensor is indicating a rich fuel condition.
- Potential Jeep Compass Context: Similar to Code 45, rich condition issues like fuel pressure regulator, injectors, or O2 sensor.
- Code 1066-Oxygen reads lean.
- Meaning: Oxygen sensor is indicating a lean fuel condition.
- Potential Jeep Compass Context: Similar to Code 44, lean condition issues like vacuum leaks, fuel delivery, or O2 sensor.
- Code 1067-Latch relay line low.
- Meaning: Low voltage in the latch relay circuit.
- Potential Jeep Compass Context: Relates to a relay circuit that maintains power to certain systems.
- Code 1068-Latch relay line high.
- Meaning: High voltage in the latch relay circuit.
- Potential Jeep Compass Context: Relates to a relay circuit that maintains power to certain systems.
- Code 1070-A/C cutout line low.
- Meaning: Low voltage in the A/C cutout line.
- Potential Jeep Compass Context: Related to the A/C cutout system, which disengages the A/C under certain conditions.
- Code 1071-A/C cutout line high.
- Meaning: High voltage in the A/C cutout line.
- Potential Jeep Compass Context: Related to the A/C cutout system.
- Code 1073-ECU does not see speed sensor signal.
- Meaning: The ECU is not receiving a signal from the vehicle speed sensor (VSS).
- Potential Jeep Compass Context: VSS is crucial for speedometer, odometer, and transmission control. A fault can affect these systems.
- Code 1200-ECU defective.
- Meaning: Indicates a fault within the Engine Control Unit itself.
- Potential Jeep Compass Context: Suggests a serious ECU failure, potentially requiring replacement.
- Code 1202-Injector shorted to ground.
- Meaning: Fuel injector circuit is shorted to ground.
- Potential Jeep Compass Context: Faulty injector or wiring causing a short circuit.
- Code 1209-Injector open.
- Meaning: Fuel injector circuit is open.
- Potential Jeep Compass Context: Faulty injector or wiring causing an open circuit, preventing fuel delivery from that injector.
- Code 1218-No voltage at ECU from power latch relay.
- Meaning: No power supply to the ECU from the power latch relay.
- Potential Jeep Compass Context: Power supply issue to the ECU, could be relay or wiring problems.
- Code 1220-No voltage at ECU from EGR solenoid.
- Meaning: No power supply to the ECU from the EGR solenoid circuit.
- Potential Jeep Compass Context: Relates to the EGR (Exhaust Gas Recirculation) system solenoid.
- Code 1221-No injector voltage.
- Meaning: No voltage supply to the fuel injectors.
- Potential Jeep Compass Context: Fuel injector relay or wiring issues preventing power to the injectors.
- Code 1222-MAP not grounded.
- Meaning: MAP sensor ground circuit is faulty.
- Potential Jeep Compass Context: Grounding issue for the MAP sensor, affecting its readings.
- Code 1223-No ECU tests run.
- Meaning: The ECU has not run its self-tests.
- Potential Jeep Compass Context: Could indicate ECU issues or problems preventing self-diagnostics from running.
OBD2 Codes for 1991-95 Models (Again, older context, but some principles apply)
These codes from the early OBD systems offer further insight into specific component failures.
- Code 88-Display used for start of test.
- Meaning: Diagnostic code indicating the start of a diagnostic test sequence.
- Potential Jeep Compass Context (Less likely): Primarily a diagnostic indicator rather than a fault code itself.
- Code 11-Camshaft signal or Ignition signal-no reference signal detected during engine cranking.
- Meaning: No signal from the camshaft or ignition system during engine cranking.
- Potential Jeep Compass Context: Crankshaft Position Sensor (CKP) or Camshaft Position Sensor (CMP) issues are common causes for no-start conditions in modern vehicles as well.
- Code 12-Memory to controller has been cleared within 50-100 engine starts.
- Meaning: Indicates the ECU memory has been recently cleared.
- Potential Jeep Compass Context: Could be normal after battery disconnection or could indicate a recent code clearing.
- Code 13-MAP sensor pneumatic signal-no variation in MAP sensor signal is detected or no difference is recognized between the engine MAP reading and the stored barometric pressure reading.
- Meaning: Problem with the MAP sensor signal, indicating either no change in reading or inconsistency with barometric pressure.
- Potential Jeep Compass Context: MAP sensor malfunction or vacuum leaks can cause these issues.
- Code 14-MAP voltage too high or too low.
- Meaning: MAP sensor voltage is outside of the acceptable range.
- Potential Jeep Compass Context: Faulty MAP sensor or wiring issues.
- Code 15-Vehicle speed sensor signal-no distance sensor signal detected during road load condition.
- Meaning: No signal from the Vehicle Speed Sensor (VSS) under road load conditions.
- Potential Jeep Compass Context: VSS issues affecting speedometer, odometer, and potentially transmission.
- Code 16-Knock sensor circuit-Open or short has been detected in the knock sensor circuit.
- Meaning: Open or short circuit in the knock sensor system.
- Potential Jeep Compass Context: Knock sensor or wiring problems.
- Code 16-Battery input sensor-battery voltage sensor input below 4 volts with engine running.
- Meaning: Low battery voltage detected by the battery voltage sensor while the engine is running.
- Potential Jeep Compass Context: Charging system issue or weak battery.
- Code 17-Low engine temperature-engine coolant temperature remains below normal operating temperature during vehicle travel; possible thermostat problem.
- Meaning: Engine not reaching operating temperature, likely a thermostat issue.
- Potential Jeep Compass Context: Thermostat stuck open, preventing the engine from warming up properly.
- Code 21-Oxygen sensor signal-neither rich or lean condition is detected from the oxygen sensor input.
- Meaning: Oxygen sensor is not detecting either rich or lean conditions, indicating a potential sensor malfunction.
- Potential Jeep Compass Context: Faulty oxygen sensor or wiring.
- Code 22-Coolant voltage low-coolant temperature sensor input below the minimum acceptable voltage/Coolant voltage high-coolant temperature sensor input above the maximum acceptable voltage.
- Meaning: Coolant temperature sensor voltage is out of range (too high or too low).
- Potential Jeep Compass Context: Faulty coolant temperature sensor or wiring.
- Code 23-Air Charge or Throttle Body temperature voltage HIGH/LOW-charge air temperature sensor input is above or below the acceptable voltage limits.
- Meaning: Intake air temperature sensor voltage out of range.
- Potential Jeep Compass Context (Turbocharged models): Faulty intake air temperature sensor or wiring.
- Code 24-Throttle Position sensor voltage high or low.
- Meaning: Throttle Position Sensor (TPS) voltage out of range.
- Potential Jeep Compass Context: Faulty TPS or wiring.
- Code 25-Automatic Idle Speed (AIS) motor driver circuit-short or open detected in 1 or more of the AIS control circuits.
- Meaning: Problem in the Automatic Idle Speed (AIS) motor circuit.
- Potential Jeep Compass Context: Idle air control valve or related wiring issues.
- Code 26-Injectors No. 1, 2, or 3 peak current not reached, high resistance in circuit.
- Meaning: Injectors 1, 2, or 3 not reaching peak current, indicating high resistance.
- Potential Jeep Compass Context: Injector or wiring problems for specific cylinders.
- Code 27-Injector control circuit-bank output driver stage does not respond properly to the control signal.
- Meaning: Injector control circuit issue, driver stage not responding correctly.
- Potential Jeep Compass Context: ECU driver issue or wiring affecting injector control.
- Code 27-Injectors No. 1, 2, or 3 control circuit and peak current not reached.
- Meaning: Injector control circuit issue and peak current not reached for injectors 1, 2, or 3.
- Potential Jeep Compass Context: Combination of injector control and current issues for specific cylinders.
- Code 31-Purge solenoid circuit-open or short detected in the purge solenoid circuit.
- Meaning: Problem in the evaporative emission (EVAP) purge solenoid circuit.
- Potential Jeep Compass Context: EVAP system purge solenoid or wiring issues.
- Code 32-Exhaust Gas Recirculation (ERG) solenoid circuit-open or short detected in the EGR solenoid circuit/EGR system failure-required changed in fuel/air ratio not detected during diagnostic test.
- Meaning: EGR solenoid circuit issue or general EGR system failure.
- Potential Jeep Compass Context: EGR valve, solenoid, or related wiring problems.
- Code 33-Air conditioner clutch relay circuit-open or short detected in the air conditioner clutch relay circuit. If vehicle doesn’t have air conditioning ignore this code.
- Meaning: A/C clutch relay circuit issue.
- Potential Jeep Compass Context: A/C clutch relay or wiring problems.
- Code 34-Speed control servo solenoids or MUX speed control circuit HIGH/LOW-open or short detected in the vacuum or vent solenoid circuits or speed control switch input above or below allowable voltage.
- Meaning: Speed control (cruise control) system issue.
- Potential Jeep Compass Context: Cruise control servo, solenoid, or switch wiring problems.
- Code 35-Radiator fan control relay circuit-open or short detected in teh radiator fan relay circuit.
- Meaning: Radiator fan relay circuit issue.
- Potential Jeep Compass Context: Radiator fan relay or wiring problems.
- Code 35-Idle switch shorted-switch input shorted to ground-some 1993 vehicles.
- Meaning: Idle switch shorted to ground (specific to some 1993 models).
- Potential Jeep Compass Context (Less likely): Idle switch issue, if applicable to the model year.
- Code 37-Part Throttle Unlock (PTU) circuit for torque converter clutch-open or short detected in the torque converter part throttle unlock solenoid circuit.
- Meaning: Torque converter clutch PTU circuit issue (automatic transmissions).
- Potential Jeep Compass Context (Automatic transmissions): Torque converter clutch solenoid or wiring problems.
- Code 37-Baro Reed Solenoid-solenoid does not turn off when it should.
- Meaning: Baro Reed Solenoid issue.
- Potential Jeep Compass Context (Less likely): Baro Reed Solenoid problem, if applicable to the model year.
- Code 37-Shift indicator circuit (manual transaxle).
- Meaning: Shift indicator circuit issue (manual transmissions).
- Potential Jeep Compass Context (Manual transmissions): Shift indicator system problem.
- Code 41-Charging system circuit-output driver stage for generator field does not respond properly to the voltage regulator control signal.
- Meaning: Charging system issue, voltage regulator control problem.
- Potential Jeep Compass Context: Alternator, voltage regulator, or wiring problems.
- Code 42-Fuel pump or no Autoshut-down (ASD) relay voltage sense at controller.
- Meaning: Fuel pump or ASD relay voltage issue.
- Potential Jeep Compass Context: Fuel pump relay, ASD relay, or wiring problems.
- Code 43-Ignition control circuit-peak primary circuit current not respond properly with maximum dwell time.
- Meaning: Ignition control circuit issue, peak current problem.
- Potential Jeep Compass Context: Ignition coil, wiring, or ECU control issue.
- Code 43-Ignition coil #1,2, or 3 primary circuits-peak primary was not achieved within the maximum allowable dwell time.
- Meaning: Ignition coil primary circuit issue for specific cylinders, peak current problem.
- Potential Jeep Compass Context: Ignition coil, wiring problems for specific cylinders.
- Code 44-Battery temperature voltage-problem exists in the PCM battery temperature circuit or there is an open or short in the engine coolant temperature circuit.
- Meaning: Battery temperature sensor circuit issue or coolant temperature circuit problem.
- Potential Jeep Compass Context: Battery temperature sensor, coolant temperature sensor, or wiring problems.
- Code 44-Fused J2 circuit in not present in the logic board; used on the signal engine module controller system.
- Meaning: Fused J2 circuit issue (specific controller system).
- Potential Jeep Compass Context (Less likely): Specific controller system issue, if applicable.
- Code 44-Overdrive solenoid circuit-open or short in overdrive solenoid circuit.
- Meaning: Overdrive solenoid circuit issue (automatic transmissions).
- Potential Jeep Compass Context (Automatic transmissions): Overdrive solenoid or wiring problems.
- Code 46-Battery voltage too high-battery voltage sense input above target charging voltage during engine operation.
- Meaning: Battery voltage too high, overcharging condition.
- Potential Jeep Compass Context: Voltage regulator or alternator overcharging issue.
- Code 47-Battery voltage too low-battery voltage sense input below target charging voltage.
- Meaning: Battery voltage too low, undercharging condition.
- Potential Jeep Compass Context: Alternator, voltage regulator, wiring, or weak battery issue.
- Code 51-Air/fuel at limit-oxygen sensor signal input indicates LEAN air/fuel ration condition during engine operation.
- Meaning: Lean air/fuel condition detected by the oxygen sensor.
- Potential Jeep Compass Context: Similar to Code 44, lean condition issues.
- Code 52-Air/fuel at limit-oxygen sensor signal input indicates RICH air/fuel ration condition during engine operation.
- Meaning: Rich air/fuel condition detected by the oxygen sensor.
- Potential Jeep Compass Context: Similar to Code 45, rich condition issues.
- Code 53-Internal controller failure-internal engine controller fault condition detected during self test.
- Meaning: Internal ECU failure.
- Potential Jeep Compass Context: Serious ECU malfunction, potentially requiring replacement.
- Code 54-Camshaft or (distributor sync.) reference circuit-No camshaft position sensor signal detected during engine rotation.
- Meaning: No camshaft position sensor signal detected during engine rotation.
- Potential Jeep Compass Context: Camshaft Position Sensor (CMP) or wiring issues.
- Code 55-End of message.
- Meaning: Diagnostic code indicating the end of a diagnostic message sequence.
- Potential Jeep Compass Context (Less likely): Diagnostic indicator, not a fault code itself.
- Code 61- Baro read solenoid-open or short detected in the baro read solenoid circuit.
- Meaning: Baro read solenoid circuit issue.
- Potential Jeep Compass Context (Less likely): Baro read solenoid or wiring problem, if applicable to the model year.
- Code 62-EMR mileage not stored-unsuccessful attempt to update EMR mileage in the controller EEPROM.
- Meaning: Mileage update issue in the ECU’s EEPROM (Electrically Erasable Programmable Read-Only Memory).
- Potential Jeep Compass Context (Less likely): ECU memory issue, potentially related to odometer or vehicle history.
- Code 63-EEPROM write denied-unsuccessful attempt to write to an EEPROM location by the controller.
- Meaning: EEPROM write failure in the ECU.
- Potential Jeep Compass Context (Less likely): ECU memory issue, potentially affecting programming or data storage.
- Code 64-Flex fuel sensor-Flex fuel sensor signal out of range-(new in 1993)-CNG Temperature voltage out of range-CN gas pressure out of range.
- Meaning: Flex fuel sensor signal out of range (if equipped), or CNG system sensor issue (CNG vehicles).
- Potential Jeep Compass Context (Flex fuel models): Flex fuel sensor or wiring problems.
- Code 66-No CCD messages or no BODY CCD messages or no EATX CCD messages-messages from the CCD bus or the body CCD or the EATX CCD were not received by the PCM.
- Meaning: Communication issue on the CCD (Chrysler Collision Detection) bus network.
- Potential Jeep Compass Context (Less likely): Communication network problem, potentially affecting multiple systems.
- Code 76-Ballast bypass relay-open or short in fuel pump relay circuit.
- Meaning: Ballast bypass relay or fuel pump relay circuit issue.
- Potential Jeep Compass Context (Less likely): Relay or wiring problem related to fuel pump circuit.
- Code 77-Speed control relay-an open or short has been detected in the speed control relay.
- Meaning: Speed control (cruise control) relay issue.
- Potential Jeep Compass Context: Cruise control relay or wiring problem.
- Code 88-Display used for start of test.
- Meaning: Diagnostic code indicating the start of a diagnostic test sequence.
- Potential Jeep Compass Context (Less likely): Diagnostic indicator, not a fault code itself.
- Code Error-Fault code error-Unrecognized fault ID received by DRBII.
- Meaning: Unrecognized fault code received by the DRBII diagnostic tool (older diagnostic tool).
- Potential Jeep Compass Context (Less likely): Diagnostic tool communication issue or an undefined code.
OBD2 Codes for 1996 and Later Models (Most Relevant to Modern Jeep Compass)
These P-codes are the standardized OBD2 codes most relevant to current Jeep Compass models.
- P0107-Manifold absolute pressure/barometric pressure circuit low input
- Meaning: Low voltage signal from the MAP/Barometric Pressure sensor circuit.
- Potential Jeep Compass Context: Faulty MAP sensor, wiring issues, vacuum leaks.
- P0108-Manifold absolute pressure/barometric pressure circuit high input
- Meaning: High voltage signal from the MAP/Barometric Pressure sensor circuit.
- Potential Jeep Compass Context: Faulty MAP sensor, wiring issues.
- P0112-Intake air temperature circuit low input
- Meaning: Low voltage signal from the Intake Air Temperature (IAT) sensor circuit.
- Potential Jeep Compass Context: Faulty IAT sensor, wiring issues.
- P0113-Intake air temperature circuit high input
- Meaning: High voltage signal from the Intake Air Temperature (IAT) sensor circuit.
- Potential Jeep Compass Context: Faulty IAT sensor, wiring issues.
- P0117-Engine coolant temperature circuit low input
- Meaning: Low voltage signal from the Engine Coolant Temperature (ECT) sensor circuit.
- Potential Jeep Compass Context: Faulty ECT sensor, wiring issues.
- P0118-Engine coolant temperature circuit high input
- Meaning: High voltage signal from the Engine Coolant Temperature (ECT) sensor circuit.
- Potential Jeep Compass Context: Faulty ECT sensor, wiring issues.
- P0121-Throttle/pedal position sensor/switch A circuit range/performance problem
- Meaning: Throttle Position Sensor (TPS) or Pedal Position Sensor (PPS) circuit range or performance issue.
- Potential Jeep Compass Context: Faulty TPS/PPS, wiring issues, throttle body problems.
- P0122-Throttle/pedal position sensor/switch A circuit low input
- Meaning: Low voltage signal from the Throttle Position Sensor (TPS) or Pedal Position Sensor (PPS) circuit.
- Potential Jeep Compass Context: Faulty TPS/PPS, wiring issues.
- P0123-Throttle/pedal position sensor/switch A circuit high input
- Meaning: High voltage signal from the Throttle Position Sensor (TPS) or Pedal Position Sensor (PPS) circuit.
- Potential Jeep Compass Context: Faulty TPS/PPS, wiring issues.
- P0125-Insufficient coolant temperature for closed loop fuel control
- Meaning: Engine coolant not reaching sufficient temperature for closed-loop fuel control.
- Potential Jeep Compass Context: Thermostat issue, ECT sensor malfunction, cooling system problems.
- P0129-Catalyst monitor slow O2 sensor (Bank no. 1 Sensor no. 2)
- Meaning: Downstream oxygen sensor (Sensor 2, Bank 1) is slow to respond during catalyst monitoring.
- Potential Jeep Compass Context: Aging downstream O2 sensor, catalytic converter efficiency issue.
- P0131-Left bank and upstream O2 sensor voltage shorted to ground
- Meaning: Upstream oxygen sensor (Sensor 1, Bank 1) voltage shorted to ground.
- Potential Jeep Compass Context: Faulty upstream O2 sensor, wiring short.
- P0132-Left upstream O2 sensor shorted to voltage
- Meaning: Upstream oxygen sensor (Sensor 1, Bank 1) voltage shorted to voltage.
- Potential Jeep Compass Context: Faulty upstream O2 sensor, wiring short.
- P0133-Upstream O2 sensor circuit slow response (Bank no. 1 Sensor no. 1)
- Meaning: Upstream oxygen sensor (Sensor 1, Bank 1) is slow to respond.
- Potential Jeep Compass Context: Aging upstream O2 sensor, exhaust leak.
- P0135-O2 sensor heater circuit malfunction (Bank no.1 Sensor no. 1)
- Meaning: Upstream oxygen sensor (Sensor 1, Bank 1) heater circuit malfunction.
- Potential Jeep Compass Context: Faulty upstream O2 sensor heater, wiring issues.
- P0137-Left bank downstream or downstream and pre-catalyst O2 sensor voltage shorted to ground
- Meaning: Downstream oxygen sensor (Sensor 2, Bank 1) voltage shorted to ground.
- Potential Jeep Compass Context: Faulty downstream O2 sensor, wiring short.
- P0138-Left bank downstream or downstream and pre-catalyst O2 sensor shorted to voltage
- Meaning: Downstream oxygen sensor (Sensor 2, Bank 1) voltage shorted to voltage.
- Potential Jeep Compass Context: Faulty downstream O2 sensor, wiring short.
- P0141-Downstream, left bank downstream or pre-catalyst O2 sensor heater failure
- Meaning: Downstream oxygen sensor (Sensor 2, Bank 1) heater failure.
- Potential Jeep Compass Context: Faulty downstream O2 sensor heater, wiring issues.
- P0152-Left upstream O2 sensor slow response
- Meaning: Upstream oxygen sensor (Sensor 1, Bank 1) slow response.
- Potential Jeep Compass Context: Aging upstream O2 sensor, exhaust leak.
- P0162-Charging system voltage too low
- Meaning: Charging system voltage is too low.
- Potential Jeep Compass Context: Alternator, voltage regulator, wiring, or weak battery issue.
- P0171-Right rear (or just) fuel system too lean
- Meaning: Fuel system is running lean (too much air, not enough fuel).
- Potential Jeep Compass Context: Vacuum leaks, fuel delivery problems (fuel pump, injectors), faulty MAF sensor.
- P0172-Left bank or fuel system too rich
- Meaning: Fuel system is running rich (too much fuel, not enough air).
- Potential Jeep Compass Context: Fuel pressure regulator issues, leaking injectors, faulty oxygen sensor.
- P0201-Injector no. 1 control circuit
- Meaning: Injector 1 control circuit malfunction.
- Potential Jeep Compass Context: Faulty injector 1, wiring issues.
- P0202-Injector no. 2 control circuit
- Meaning: Injector 2 control circuit malfunction.
- Potential Jeep Compass Context: Faulty injector 2, wiring issues.
- P0203-Injector no. 3 control circuit
- Meaning: Injector 3 control circuit malfunction.
- Potential Jeep Compass Context: Faulty injector 3, wiring issues.
- P0204-Injector no. 4 control circuit
- Meaning: Injector 4 control circuit malfunction.
- Potential Jeep Compass Context: Faulty injector 4, wiring issues.
- P0205-Injector no. 5 control circuit
- Meaning: Injector 5 control circuit malfunction.
- Potential Jeep Compass Context: Faulty injector 5, wiring issues (if applicable to engine type).
- P0206-Injector no. 6 control circuit
- Meaning: Injector 6 control circuit malfunction.
- Potential Jeep Compass Context: Faulty injector 6, wiring issues (if applicable to engine type).
- P0207-Injector no. 7 control circuit
- Meaning: Injector 7 control circuit malfunction.
- Potential Jeep Compass Context: Faulty injector 7, wiring issues (if applicable to engine type).
- P0208-Injector no. 8 control circuit
- Meaning: Injector 8 control circuit malfunction.
- Potential Jeep Compass Context: Faulty injector 8, wiring issues (if applicable to engine type).
- P0300-Random/multiple cylinder misfire detected
- Meaning: Misfire detected in multiple cylinders or randomly across cylinders.
- Potential Jeep Compass Context: Spark plugs, ignition coils, fuel injectors, vacuum leaks, low compression, etc.
- P0301-Cylinder no. 1-Misfire detected
- Meaning: Misfire detected in cylinder 1.
- Potential Jeep Compass Context: Spark plug, ignition coil, fuel injector for cylinder 1.
- P0302-Cylinder no. 2-Misfire detected
- Meaning: Misfire detected in cylinder 2.
- Potential Jeep Compass Context: Spark plug, ignition coil, fuel injector for cylinder 2.
- P0303-Cylinder no. 3-Misfire detected
- Meaning: Misfire detected in cylinder 3.
- Potential Jeep Compass Context: Spark plug, ignition coil, fuel injector for cylinder 3.
- P0304-Cylinder no. 4-Misfire detected
- Meaning: Misfire detected in cylinder 4.
- Potential Jeep Compass Context: Spark plug, ignition coil, fuel injector for cylinder 4.
- P0305-Cylinder no. 5-Misfire detected
- Meaning: Misfire detected in cylinder 5.
- Potential Jeep Compass Context: Spark plug, ignition coil, fuel injector for cylinder 5 (if applicable to engine type).
- P0306-Cylinder no. 6-Misfire detected
- Meaning: Misfire detected in cylinder 6.
- Potential Jeep Compass Context: Spark plug, ignition coil, fuel injector for cylinder 6 (if applicable to engine type).
- P0307-Cylinder no. 7-Misfire detected
- Meaning: Misfire detected in cylinder 7.
- Potential Jeep Compass Context: Spark plug, ignition coil, fuel injector for cylinder 7 (if applicable to engine type).
- P0308-Cylinder no. 8-Misfire detected
- Meaning: Misfire detected in cylinder 8.
- Potential Jeep Compass Context: Spark plug, ignition coil, fuel injector for cylinder 8 (if applicable to engine type).
- P0320-No crank reference signal PCM
- Meaning: No Crankshaft Position Sensor (CKP) signal detected by the PCM (Powertrain Control Module).
- Potential Jeep Compass Context: Faulty CKP sensor, wiring issues.
- P0340-No cam signal at PCM
- Meaning: No Camshaft Position Sensor (CMP) signal detected by the PCM.
- Potential Jeep Compass Context: Faulty CMP sensor, wiring issues.
- P0351-Ignition coil no. 1 primary circuit
- Meaning: Ignition coil 1 primary circuit malfunction.
- Potential Jeep Compass Context: Faulty ignition coil 1, wiring issues.
- P0420-Left bank catalytic converter or just catalytic converter efficiency failure
- Meaning: Catalytic converter efficiency below threshold.
- Potential Jeep Compass Context: Failing catalytic converter, exhaust leaks, O2 sensor issues.
- P0441-Evaporative purge flow monitor failure
- Meaning: Evaporative Emission (EVAP) purge flow monitor failure.
- Potential Jeep Compass Context: EVAP purge solenoid, vacuum lines, EVAP system leaks.
- P0442-Evaporative emission control system leak detected (small leak)
- Meaning: Small leak detected in the EVAP system.
- Potential Jeep Compass Context: Loose fuel cap, cracked vacuum lines, EVAP system component leaks.
- P0443-Evap purge solenoid circuit
- Meaning: EVAP purge solenoid circuit malfunction.
- Potential Jeep Compass Context: Faulty EVAP purge solenoid, wiring issues.
- P0455-Evaporative emission control system leak detected (gross leak)
- Meaning: Large leak detected in the EVAP system.
- Potential Jeep Compass Context: Loose fuel cap, large vacuum line leaks, EVAP system component failures.
- P0460-Fuel level unit no change over miles
- Meaning: Fuel level sensor reading not changing over a distance driven.
- Potential Jeep Compass Context: Faulty fuel level sensor, wiring issues.
- P0462-Fuel level sending unit voltage too low
- Meaning: Low voltage signal from the fuel level sending unit.
- Potential Jeep Compass Context: Faulty fuel level sensor, wiring issues.
- P0463-Fuel level sending unit voltage too high
- Meaning: High voltage signal from the fuel level sending unit.
- Potential Jeep Compass Context: Faulty fuel level sensor, wiring issues.
- P0500-No vehicle speed sensor signal
- Meaning: No Vehicle Speed Sensor (VSS) signal detected.
- Potential Jeep Compass Context: Faulty VSS sensor, wiring issues.
- P0505-Idle air control motor circuits
- Meaning: Idle Air Control (IAC) motor circuit malfunction.
- Potential Jeep Compass Context: Faulty IAC valve, wiring issues.
- P0600-PCM/Serial communication link malfunction
- Meaning: PCM communication link malfunction.
- Potential Jeep Compass Context: PCM communication network issues, wiring problems.
- P0601-Internal controller failure
- Meaning: Internal PCM failure.
- Potential Jeep Compass Context: PCM malfunction, potentially requiring replacement.
- P0622-Generator field not switching properly
- Meaning: Alternator field control issue.
- Potential Jeep Compass Context: Alternator or voltage regulator problem.
- P0645-A/C clutch relay circuit
- Meaning: A/C clutch relay circuit malfunction.
- Potential Jeep Compass Context: A/C clutch relay or wiring issues.
- P0711-Transmission fluid temperature sensor, no temperature rise after start
- Meaning: Transmission Fluid Temperature (TFT) sensor not showing temperature increase after starting.
- Potential Jeep Compass Context (Automatic transmissions): Faulty TFT sensor, wiring issues.
- P0712-Transmission fluid temperature sensor voltage too low
- Meaning: Low voltage signal from the Transmission Fluid Temperature (TFT) sensor.
- Potential Jeep Compass Context (Automatic transmissions): Faulty TFT sensor, wiring issues.
- P0713-Transmission fluid temperature sensor voltage too high
- Meaning: High voltage signal from the Transmission Fluid Temperature (TFT) sensor.
- Potential Jeep Compass Context (Automatic transmissions): Faulty TFT sensor, wiring issues.
- P0720-Low output speed sensor RPM above 15 MPH
- Meaning: Low output speed sensor RPM reading when vehicle speed is above 15 MPH.
- Potential Jeep Compass Context (Automatic transmissions): Output speed sensor issue, transmission problems.
- P0740-Torque converter clutch, no RPM drop at lockup
- Meaning: Torque Converter Clutch (TCC) not locking up properly (no RPM drop).
- Potential Jeep Compass Context (Automatic transmissions): Torque converter clutch solenoid, wiring issues, transmission problems.
- P0743-Torque converter clutch solenoid/trans relay circuits
- Meaning: Torque Converter Clutch (TCC) solenoid or transmission relay circuit malfunction.
- Potential Jeep Compass Context (Automatic transmissions): Torque converter clutch solenoid, relay, or wiring issues.
- P0748-Governor pressure solenoid control/trans relay circuits
- Meaning: Governor pressure solenoid control or transmission relay circuit malfunction.
- Potential Jeep Compass Context (Automatic transmissions): Governor pressure solenoid, relay, or wiring issues.
- P0751-Overdrive switch pressed (LO) more than 5 minutes
- Meaning: Overdrive switch stuck in the low position for an extended time.
- Potential Jeep Compass Context (Automatic transmissions): Overdrive switch or wiring issue.
- P0753-Trans 3-4 shift solenoid/trans relay circuits
- Meaning: 3-4 shift solenoid or transmission relay circuit malfunction.
- Potential Jeep Compass Context (Automatic transmissions): 3-4 shift solenoid, relay, or wiring issues.
- P0783-3-4 shift solenoid, no RPM drop @ 3-4 shift
- Meaning: 3-4 shift solenoid issue, no RPM drop during 3-4 shift.
- Potential Jeep Compass Context (Automatic transmissions): 3-4 shift solenoid or transmission problems.
- P1195-Catalyst monitor slow O2 sensor (Bank no. 1 Sensor no. 1)
- Meaning: Upstream oxygen sensor (Sensor 1, Bank 1) is slow to respond during catalyst monitoring.
- Potential Jeep Compass Context: Aging upstream O2 sensor, exhaust leak.
- P1197-Catalyst monitor slow O2 sensor (Bank no. 1 Sensor no. 2)
- Meaning: Downstream oxygen sensor (Sensor 2, Bank 1) is slow to respond during catalyst monitoring.
- Potential Jeep Compass Context: Aging downstream O2 sensor, catalytic converter efficiency issue.
- P1281-Engine is cold too long
- Meaning: Engine taking too long to reach operating temperature.
- Potential Jeep Compass Context: Thermostat issue, ECT sensor malfunction.
- P1282-Fuel pump relay control circuit
- Meaning: Fuel pump relay control circuit malfunction.
- Potential Jeep Compass Context: Fuel pump relay or wiring issues.
- P1294-Target idle not reached
- Meaning: Engine idle speed not reaching the target idle RPM.
- Potential Jeep Compass Context: Idle air control valve, vacuum leaks, throttle body issues.
- P1296-No 5 volts to MAP sensor
- Meaning: No 5-volt reference voltage to the MAP sensor.
- Potential Jeep Compass Context: Wiring issue, PCM problem.
- P1297-No change in MAP from start to run
- Meaning: No change in MAP sensor reading from engine start to running condition.
- Potential Jeep Compass Context: Faulty MAP sensor, vacuum leaks.
- P1388-Auto shutdown relay control circuit
- Meaning: Auto Shutdown (ASD) relay control circuit malfunction.
- Potential Jeep Compass Context: ASD relay or wiring issues.
- P1389-No ASD relay output voltage at PCM
- Meaning: No output voltage from the ASD relay detected at the PCM.
- Potential Jeep Compass Context: ASD relay or wiring issues.
- P1391-Intermittent loss of CMP or CKP
- Meaning: Intermittent signal loss from the Camshaft Position Sensor (CMP) or Crankshaft Position Sensor (CKP).
- Potential Jeep Compass Context: Intermittent CMP or CKP sensor failure, wiring issues.
- P1398-Misfire adaptive numerator at limit or no crank sensor learn
- Meaning: Misfire adaptive learning limit reached or crank sensor learn procedure not performed.
- Potential Jeep Compass Context: Misfire issues, CKP sensor relearn needed after replacement.
- P1486-EVAP leak monitor pinched hose or obstruction found
- Meaning: EVAP leak monitor detecting a pinched hose or obstruction.
- Potential Jeep Compass Context: EVAP system hose obstruction or damage.
- P1492-Battery temp sensor voltage too high
- Meaning: High voltage signal from the battery temperature sensor.
- Potential Jeep Compass Context: Faulty battery temperature sensor, wiring issues.
- P1493-Battery temp sensor voltage too low
- Meaning: Low voltage signal from the battery temperature sensor.
- Potential Jeep Compass Context: Faulty battery temperature sensor, wiring issues.
- P1494-Leak detection pump pressure switch or mechanical fault
- Meaning: EVAP Leak Detection Pump (LDP) pressure switch or mechanical fault.
- Potential Jeep Compass Context: Faulty LDP, EVAP system leaks.
- P1495-Leak detection pump solenoid circuit
- Meaning: EVAP Leak Detection Pump (LDP) solenoid circuit malfunction.
- Potential Jeep Compass Context: Faulty LDP solenoid, wiring issues.
- P1594-Charging system voltage too high
- Meaning: Charging system voltage is too high.
- Potential Jeep Compass Context: Voltage regulator or alternator overcharging issue.
- P1595-Speed control solenoid circuits
- Meaning: Speed control (cruise control) solenoid circuit malfunction.
- Potential Jeep Compass Context: Cruise control solenoid or wiring issues.
- P1596-Speed control switch always high
- Meaning: Speed control switch signal always high.
- Potential Jeep Compass Context: Cruise control switch or wiring issue.
- P1597-Speed control switch always low
- Meaning: Speed control switch signal always low.
- Potential Jeep Compass Context: Cruise control switch or wiring issue.
- P1683-Speed control power circuit
- Meaning: Speed control (cruise control) power circuit malfunction.
- Potential Jeep Compass Context: Cruise control power supply or wiring issues.
- P1696-PCM failure EEPROM write denied
- Meaning: PCM EEPROM write failure.
- Potential Jeep Compass Context: PCM memory issue, potentially requiring replacement.
- P1698-PCM failure EEPROM write denied
- Meaning: PCM EEPROM write failure.
- Potential Jeep Compass Context: PCM memory issue, potentially requiring replacement.
- P1756-Governor pressure not equal to target @ 15-20 PSI
- Meaning: Governor pressure not matching target in the 15-20 PSI range.
- Potential Jeep Compass Context (Automatic transmissions): Governor pressure solenoid, sensor, or transmission problems.
- P1757-Governor pressure above 3 PSI in gear with 0 MPH
- Meaning: Governor pressure too high (above 3 PSI) in gear at 0 MPH.
- Potential Jeep Compass Context (Automatic transmissions): Governor pressure solenoid, sensor, or transmission problems.
- P1762-Governor pressure sensor offset volts too low or high
- Meaning: Governor pressure sensor offset voltage out of range.
- Potential Jeep Compass Context (Automatic transmissions): Faulty governor pressure sensor or wiring.
- P1763-Governor pressure sensor volts too high
- Meaning: High voltage signal from the governor pressure sensor.
- Potential Jeep Compass Context (Automatic transmissions): Faulty governor pressure sensor or wiring.
- P1764-Governor pressure sensor volts too low
- Meaning: Low voltage signal from the governor pressure sensor.
- Potential Jeep Compass Context (Automatic transmissions): Faulty governor pressure sensor or wiring.
- P1765-Trans 12 volts supply relay control circuit
- Meaning: Transmission 12V supply relay control circuit malfunction.
- Potential Jeep Compass Context (Automatic transmissions): Transmission relay or wiring issues.
- P1899-P/N switch stuck in park or in gear
- Meaning: Park/Neutral (P/N) switch stuck in Park or Gear.
- Potential Jeep Compass Context (Automatic transmissions): Faulty P/N switch, wiring issues, or shifter linkage problems.
Conclusion
Understanding Jeep Compass Obd2 Codes is a crucial first step in diagnosing and resolving vehicle issues. While this guide provides a comprehensive overview of potential codes and their meanings, it’s important to remember that proper diagnosis often requires professional expertise and specialized tools.
If your Jeep Compass displays a check engine light, retrieving the OBD2 code is highly recommended. Use this guide as a starting point to understand the potential problem areas. However, for accurate diagnosis and repair, always consult a certified mechanic. Attempting repairs without proper knowledge can sometimes lead to further complications. This guide is for informational purposes and to empower Jeep Compass owners with a better understanding of their vehicle’s diagnostic system.
