Decoding Your Jeep Wrangler JK Check Engine Light: A Comprehensive OBD2 Guide

Encountering a check engine light in your Jeep Wrangler JK can be unsettling. It’s your vehicle’s way of signaling that its onboard computer has detected a potential issue within its systems. This Malfunction Indicator Light (MIL), commonly known as the check engine light, isn’t specific about the problem, leaving many Jeep owners puzzled. Fortunately, diagnosing these issues on your Jeep Wrangler JK can be straightforward, especially with the right knowledge of OBD2 systems. This guide will walk you through understanding your JK’s check engine light and utilizing OBD2 tools to pinpoint problems effectively.

One of the simplest methods to retrieve these Diagnostic Trouble Codes (DTCs) on a Jeep Wrangler JK involves using your ignition key. Here’s how to do it step-by-step:

1. Key Position: Insert your key into the ignition cylinder and turn it to the “ON” position. This is the position right before you would start the engine. Ensure the engine remains off during this process.
2. The Key Cycling Technique: Press and hold the key inward into the ignition cylinder. While holding it in, cycle the key from “OFF” to “ON” three times in quick succession, ending in the “ON” position. Maintaining pressure on the key prevents accidental interruption of the sequence.
3. Code Display: If executed correctly, your Jeep Wrangler JK’s odometer will initially display a series of dashes. Shortly after, it will begin to show a Diagnostic Trouble Code (DTC). Carefully note this code for later reference.

Alt: Illuminated check engine light on a Jeep Wrangler JK dashboard, indicating a potential vehicle issue.

While the key cycling method is a handy trick, some Jeep JK owners find it doesn’t work consistently. An alternative approach that has proven successful for some is cycling the key between the “ON” and “ACC” (Accessory) positions instead of “ON” and “OFF.” If neither of these key methods yields a code, it might indicate an issue with the dash code reader itself.

For a more reliable and feature-rich diagnostic experience, consider using dedicated OBD2 (On-Board Diagnostics II) tools. OBD2 scanners plug directly into your Jeep Wrangler JK’s OBD2 port, typically located under the dashboard on the driver’s side. These scanners offer several advantages:

• Accurate and Instant Code Retrieval: OBD2 scanners provide quick and accurate readings of DTCs, eliminating the guesswork associated with key cycling.
• Code Definition Display: Beyond just showing a code, many OBD2 scanners display the text definition of the error, giving you immediate insight into the problem.
• Code Clearing Capability: Once a repair is made, OBD2 scanners can clear the check engine light, a feature not available with the key method.
• Live Data Monitoring: Advanced scanners can display real-time data from your Jeep’s sensors, which is invaluable for diagnosing intermittent issues or monitoring system performance.
• Additional Features: Many OBD2 devices go beyond basic diagnostics, offering functionalities like:
  • Speedometer Calibration: Essential after tire size or gear ratio changes to maintain accurate speed readings and transmission shifting.
  • Idle Adjustment: Useful for accommodating accessories like winches that can increase engine load at idle.
  • Daytime Running Light Activation: Enabling or customizing vehicle lighting features.

Investing in an OBD2 scanner for your Jeep Wrangler JK is a worthwhile investment for any Jeep owner who prefers to be proactive about vehicle maintenance. These tools range from basic code readers to advanced programmers and tuners with extensive capabilities.

Alt: Automotive technician connecting an OBD2 scanner to the diagnostic port of a Jeep Wrangler JK for vehicle system analysis.

Once you have retrieved a DTC, whether through the key method or an OBD2 scanner, the next step is to understand what the code signifies. Diagnostic Trouble Codes are standardized across the automotive industry and are categorized into different groups, often indicated by the first character of the code:

• P-Codes (Powertrain): These are the most common and relate to the engine, transmission, and related components.
• B-Codes (Body): These codes pertain to body-related systems like airbags, power windows, and lighting.
• C-Codes (Chassis): Chassis codes relate to systems like ABS (Anti-lock Braking System), steering, and suspension.
• U-Codes (Network/Communication): These codes indicate communication issues between different electronic control modules within the vehicle.

Below is a comprehensive list of Diagnostic Trouble Codes that may be displayed by your Jeep Wrangler JK. This list, while extensive, primarily covers B-codes as provided in the original source. Keep in mind that P, C, and U codes are also crucial for a complete diagnosis and are widely available through online resources and OBD2 scanner databases.

Jeep Wrangler JK Diagnostic Trouble Codes (Partial List)

• B1402 – FRONT LEFT AUDIO SPEAKER OUTPUT CIRCUIT HIGH
• B1403 – FRONT LEFT AUDIO SPEAKER OUTPUT CIRCUIT OPEN
• B1405 – FRONT RIGHT AUDIO SPEAKER OUTPUT CIRCUIT LOW
• B1406 – FRONT RIGHT AUDIO SPEAKER OUTPUT CIRCUIT HIGH
• B1407 – FRONT RIGHT AUDIO SPEAKER OUTPUT CIRCUIT OPEN
• B1409 – REAR LEFT AUDIO SPEAKER OUTPUT CIRCUIT LOW
• B140A – REAR LEFT AUDIO SPEAKER OUTPUT CIRCUIT HIGH
• B140B – REAR LEFT AUDIO SPEAKER OUTPUT CIRCUIT OPEN
• B140D – REAR RIGHT AUDIO SPEAKER OUTPUT CIRCUIT LOW
• B140E – REAR RIGHT AUDIO SPEAKER OUTPUT CIRCUIT HIGH
• B140F – REAR RIGHT AUDIO SPEAKER OUTPUT CIRCUIT OPEN
• B1420 – AUDIO CASSETTE ERROR/INOPERABLE CASSETTE
• B1421 – AUDIO CD READ ERROR/INOPERABLE DISC
• B1422 – AUDIO DVD READ ERROR/INOPERABLE DISC
• B1423 – VES DVD READ ERROR/INOPERABLE DISC
• B1424 – IMPROPER DVD-WRONG REGION
• B1429 – RADIO DISPLAY HIGH TEMPERATURE
• B142A – RADIO UNIT HIGH TEMPERATURE
• B142C – VES VIDEO SCREEN DISCONNECTED
• B142D – AUDIO ANTENNA NOT CONNECTED
• B142E – GPS ANTENNA NOT CONNECTED
• B142F – SATELLITE RADIO ANTENNA NOT CONNECTED
• B1430 – SATELLITE RADIO ANTENNA INTERNAL PERFORMANCE
• B1460 – CHANNEL 1 AUDIO SPEAKER OUTPUT CIRCUIT PERFORMANCE
• B1461 – CHANNEL 1 AUDIO SPEAKER OUTPUT CIRCUIT LOW
• B1462 – CHANNEL 1 AUDIO SPEAKER OUTPUT CIRCUIT HIGH
• B1463 – CHANNEL 1 AUDIO SPEAKER OUTPUT CIRCUIT OPEN
• B1464 – CHANNEL 1 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER
• B1465 – CHANNEL 2 AUDIO SPEAKER OUTPUT CIRCUIT PERFORMANCE
• B1466 – CHANNEL 2 AUDIO SPEAKER OUTPUT CIRCUIT LOW
• B1467 – CHANNEL 2 AUDIO SPEAKER OUTPUT CIRCUIT HIGH
• B1468 – CHANNEL 2 AUDIO SPEAKER OUTPUT CIRCUIT OPEN
• B1469 – CHANNEL 2 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER
• B146A – CHANNEL 3 AUDIO SPEAKER OUTPUT CIRCUIT PERFORMANCE
• B146B – CHANNEL 3 AUDIO SPEAKER OUTPUT CIRCUIT LOW
• B146C – CHANNEL 3 AUDIO SPEAKER OUTPUT CIRCUIT HIGH
• B146D – CHANNEL 3 AUDIO SPEAKER OUTPUT CIRCUIT OPEN
• B146E – CHANNEL 3 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER
• B146F – CHANNEL 4 AUDIO SPEAKER OUTPUT CIRCUIT PERFORMANCE
• B1470 – CHANNEL 4 AUDIO SPEAKER OUTPUT CIRCUIT LOW
• B1471 – CHANNEL 4 AUDIO SPEAKER OUTPUT CIRCUIT HIGH
• B1472 – CHANNEL 4 AUDIO SPEAKER OUTPUT CIRCUIT OPEN
• B1473 – CHANNEL 4 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER
• B1474 – CHANNEL 5 AUDIO SPEAKER OUTPUT CIRCUIT PERFORMANCE
• B1475 – CHANNEL 5 AUDIO SPEAKER OUTPUT CIRCUIT LOW
• B1476 – CHANNEL 5 AUDIO SPEAKER OUTPUT CIRCUIT HIGH
• B1477 – CHANNEL 5 AUDIO SPEAKER OUTPUT CIRCUIT OPEN
• B1478 – CHANNEL 5 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER
• B1479 – CHANNEL 6 AUDIO SPEAKER OUTPUT CIRCUIT PERFORMANCE
• B147A – CHANNEL 6 AUDIO SPEAKER OUTPUT CIRCUIT LOW
• B147B – CHANNEL 6 AUDIO SPEAKER OUTPUT CIRCUIT HIGH
• B147C – CHANNEL 6 AUDIO SPEAKER OUTPUT CIRCUIT OPEN
• B147D – CHANNEL 6 AUDIO SPEAKER OUTPUT CIRCUIT SHORTED TOGETHER
• B1613 – PANEL ILLUMINATION CONTROL CIRCUIT LOW
• B1615 – PANEL ILLUMINATION CONTROL CIRCUIT OPEN
• B161A – COURTESY/DOME LAMP CONTROL CIRCUIT
• B161E – READING LAMP CONTROL CIRCUIT
• B162B – LEFT LOW BEAM CONTROL CIRCUIT LOW
• B162C – LT LOW BEAM CONTROL CKT HI
• B162F – RIGHT LOW BEAM CONTROL CIRCUIT LOW
• B1630 – RIGHT LOW BEAM CONTROL CIRCUIT HIGH
• B1633 – LEFT HI BEAM CONTROL CIRCUIT LOW
• B1634 – LEFT HI BEAM CONTROL CIRCUIT HIGH
• B1637 – RIGHT HI BEAM CONTROL CIRCUIT LOW
• B1638 – RIGHT HI BEAM CONTROL CIRCUIT HIGH
• B163B – FRONT LEFT TURN CONTROL CIRCUIT LOW
• B163C – FRONT LEFT TURN CONTROL CIRCUIT HIGH
• B163F – FRONT RIGHT TURN CONTROL CIRCUIT LOW
• B1640 – FRONT RIGHT TURN CONTROL CIRCUIT HIGH
• B1643 – REAR LEFT TURN CONTROL CIRCUIT LOW
• B1644 – REAR LEFT TURN CONTROL CIRCUIT HIGH
• B1644 – RIGHT STOP LAMP CONTROL CIRCUIT HIGH
• B1647 – REAR RIGHT TURN CONTROL CIRCUIT LOW
• B1648 – REAR RIGHT TURN CONTROL CIRCUIT HIGH
• B1663 – REAR FOG LAMP CONTROL CIRCUIT LOW
• B1664 – REAR FOG LAMP CONTROL CIRCUIT HIGH
• B166B – LEFT TRAILER TOW LAMP CONTROL CIRCUIT LOW
• B166C – LEFT TRAILER TOW LAMP CONTROL CIRCUIT HIGH
• B166F – RIGHT TRAILER TOW LAMP CONTROL CIRCUIT LOW
• B1670 – RIGHT TRAILER TOW LAMP CONTROL CIRCUIT HIGH
• B16B1 – LEFT STOP LAMP CONTROL CIRCUIT HIGH
• B16F8 – FRONT LEFT FOG LAMP CONTROL CIRCUIT LOW
• B16F9 – FRONT LEFT FOG LAMP CONTROL CIRCUIT HIGH
• B16FC – FRONT RIGHT FOG LAMP CONTROL CIRCUIT LOW
• B16FD – FRONT RIGHT FOG LAMP CONTROL CIRCUIT HIGH
• B17B8 – LEFT STOP LAMP CONTROL CIRCUIT OVERCURRENT
• B17B9 – RIGHT STOP LAMP CONTROL CIRCUIT OVERCURRENT
• B17BA – HEADLAMP LEVELING MOTOR CONTROL CIRCUIT OVERCURRENT
• B17BF – LEFT SIDEMARKER LAMP CONTROL CIRCUIT OVERCURRENT
• B17C4 – RIGHT SIDEMARKER LAMP CONTROL CIRCUIT OVERCURRENT
• B1801 – DRIVER DOOR LOCK/UNLOCK SWITCH CIRCUIT LOW – CLUSTER
• B1806 – PASSENGER DOOR LOCK/UNLOCK SWITCH CIRCUIT LOW – TIPM
• B1934 – DRIVER DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK – CLUSTER
• B1935 – PASSENGER DOOR LOCK/UNLOCK SWITCH CIRCUIT STUCK – TIPM
• B1A08 – RKE FOB 1 PERFORMANCE
• B1A09 – RKE FOB 2 PERFORMANCE
• B1A0A – RKE FOB 3 PERFORMANCE
• B1A0B – RKE FOB 4 PERFORMANCE
• B1A0C – RKE FOB 5 PERFORMANCE
• B1A0D – RKE FOB 6 PERFORMANCE
• B1A0E – RKE FOB 7 PERFORMANCE
• B1A0F – RKE FOB 8 PERFORMANCE
• B1A10 – RKE FOB 1 BATTERY LOW
• B1A11 – RKE FOB 2 BATTERY LOW
• B1A12 – RKE FOB 3 BATTERY LOW
• B1A13 – RKE FOB 4 BATTERY LOW
• B1A14 – RKE FOB 5 BATTERY LOW
• B1A15 – RKE FOB 6 BATTERY LOW
• B1A16 – RKE FOB 7 BATTERY LOW
• B1A17 – RKE FOB 8 BATTERY LOW
• B1A20 – PRE-ARM TIMEOUT
• B1A23 – RKE RECEIVER PERFORMANCE
• B1A24 – KEY NOT PROGRAMMED
• B1A25 – INVALID KEY
• B1A26 – MAXIMUM NUMBER OF KEYS PROGRAMMED
• B1A27 – SKREEM PROGRAMMING PERFORMANCE
• B1A28 – ECM MISMATCH WITH SKIM
• B1A29 – SKIM BASESTATION MISMATCH
• B1A3C – INTERNAL SIREN BATTERY
• B1A3D – SIREN BATTERY / LOSS OF POWER SUPPLY
• B1A3E – SIREN/ITM MISMATCH
• B1A3F – ITM ARMING SEQUENCE PERFORMANCE
• B1A48 – INTRUSION SENSOR 1 INTERNAL
• B1A5F – INTRUSION SENSOR 2 INTERNAL
• B1A6D – INTRUSION SENSOR 3 INTERNAL
• B1B00 – DRIVER AIRBAG SQUIB 1 CIRCUIT LOW
• B1B01 – DRIVER AIRBAG SQUIB 1 CIRCUIT HIGH
• B1B02 – DRIVER AIRBAG SQUIB 1 CIRCUIT OPEN
• B1B03 – DRIVER AIRBAG SQUIB 1 CIRCUIT SHORTED TOGETHER
• B1B04 – DRIVER AIRBAG SQUIB 2 CIRCUIT LOW
• B1B05 – DRIVER AIRBAG SQUIB 2 CIRCUIT HIGH
• B1B06 – DRIVER AIRBAG SQUIB 2 CIRCUIT OPEN
• B1B07 – DRIVER AIRBAG SQUIB 2 CIRCUIT SHORTED TOGETHER
• B1B08 – PASSENGER AIRBAG SQUIB 1 CIRCUIT LOW
• B1B09 – PASSENGER AIRBAG SQUIB 1 CIRCUIT HIGH
• B1B0A – PASSENGER AIRBAG SQUIB 1 CIRCUIT OPEN
• B1B0B – PASSENGER AIRBAG SQUIB 1 CIRCUIT SHORTED TOGETHER
• B1B0C – PASSENGER AIRBAG SQUIB 2 CIRCUIT LOW
• B1B0D – PASSENGER AIRBAG SQUIB 2 CIRCUIT HIGH
• B1B0E – PASSENGER AIRBAG SQUIB 2 CIRCUIT OPEN
• B1B0F – PASSENGER AIRBAG SQUIB 2 CIRCUITS SHORTED TOGETHER
• B1B54 – 1ST ROW PASSENGER SEAT BELT SENSOR CIRCUIT LOW
• B1B55 – 1 ST ROW PASSENGER SEAT BELT SENSOR CIRCUIT HIGH
• B1B56 – 1 ST ROW PASSENGER SEAT BELT SENSOR CIRCUIT OPEN
• B1B70 – UP-FRONT LEFT SATELLITE ACCELERATION SENSOR INTERNAL
• B1B71 – UP-FRONT RIGHT SATELLITE ACCELERATION SENSOR INTERNAL
• B1B72 – LEFT SIDE SATELLITE ACCELERATION SENSOR 1 INTERNAL
• B1B75 – RIGHT SIDE SATELLITE ACCELERATION SENSOR 1 INTERNAL
• B1B78 – PASSENGER SEAT WEIGHT SENSOR 3 – LEFT FRONT PERFORMANCE
• B1B79 – PASSENGER SEAT WEIGHT SENSOR 3 – LEFT FRONT INPUT CIRCUIT LOW
• B1B7A – PASSENGER SEAT WEIGHT SENSOR 3 – LEFT FRONT INPUT CIRCUIT HIGH
• B1B7D – PASSENGER SEAT WEIGHT SENSOR 2 – RIGHT FRONT PERFORMANCE
• B1B7E – PASSENGER SEAT WEIGHT SENSOR 2 – RIGHT FRONT INPUT CIRCUIT LOW
• B1B7F – PASSENGER SEAT WEIGHT SENSOR 2 – RIGHT FRONT INPUT CIRCUIT HIGH
• B1B82 – PASSENGER SEAT WEIGHT SENSOR 4 – LEFT REAR PERFORMANCE
• B1B83 – PASSENGER SEAT WEIGHT SENSOR 4 – LEFT REAR INPUT CIRCUIT LOW
• B1B84 – PASSENGER SEAT WEIGHT SENSOR 4 – LEFT REAR INPUT CIRCUIT HIGH
• B1B87 – PASSENGER SEAT WEIGHT SENSOR 1 – RIGHT REAR PERFORMANCE
• B1B88 – PASSENGER SEAT WEIGHT SENSOR 1 – RIGHT REAR INPUT CIRCUIT LOW
• B1B89 – PASSENGER SEAT WEIGHT SENSOR 1 – RIGHT REAR INPUT CIRCUIT HIGH
• B1B8D – DRIVER SEAT TRACK POSITION SENSOR CIRCUIT LOW
• B1B8E – DRIVER SEAT TRACK POSITION SENSOR CIRCUIT HIGH
• B1B8F – DRIVER SEAT TRACK POSITION SENSOR CIRCUIT OPEN
• B1B93 – PASSENGER SEAT TRACK POSITION SENSOR CIRCUIT LOW
• B1B94 – PASSENGER SEAT TRACK POSITION SENSOR CIRCUIT HIGH
• B1B95 – PASSENGER SEAT TRACK POSITION SENSOR CIRCUIT OPEN
• B1BA5 – AIRBAG SQUIB CONFIGURATION MISMATCH
• B1BA6 – OCCUPANT CLASSIFICATION UNDETERMINED
• B1BA7 – OCCUPANT CLASSIFICATION SYSTEM VERIFICATION REQUIRED
• B1BA8 – OCM SYSTEM OUT OF CALIBRATION/NOT CALIBRATED
• B1BAA – OCCUPANT CLASSIFICATION MODULE CONFIGURATION MISMATCH
• B1BBA – PASSENGER SEAT WEIGHT SENSOR SUPPLY CIRCUIT
• B1BBB – PASSENGER SEAT WEIGHT SENSOR INPUTS SHORTED TOGETHER
• B1BBC – OCS NEGATIVE SYSTEM WEIGHT
• B1BBD – OCM CURRENT CONFIGURATION TABLE UNPROGRAMMED
• B1BC7 – DEPLOYMENT DATA RECORD FULL
• B1C27 – LEFT SIDE SEAT THORAX SQUIB 1 LOW
• B1C28 – LEFT SIDE SEAT THORAX SQUIB 1 HIGH
• B1C29 – LEFT SIDE SEAT THORAX SQUIB 1 OPEN
• B1C2A – LEFT SIDE SEAT THORAX SQUIB 1 SHORTED TOGETHER
• B1C2B – RIGHT SIDE SEAT THORAX SQUIB 1 LOW
• B1C2C – RIGHT SIDE SEAT THORAX SQUIB 1 HIGH
• B1C2D – RIGHT SIDE SEAT THORAX SQUIB 1 OPEN
• B1C2E – RIGHT SIDE SEAT THORAX SQUIB 1 SHORTED TOGETHER
• B1C38 – 1ST ROW DRIVER RETRACTOR PRETENSIONER CIRCUIT LOW
• B1C39 – 1ST ROW DRIVER RETRACTOR PRETENSIONER CIRCUIT HIGH
• B1C3A – 1ST ROW DRIVER RETRACTOR PRETENSIONER CIRCUIT OPEN
• B1C3B – 1ST ROW DRIVER RETRACTOR PRETENSIONER CIRCUIT SHORTED TOGETHER
• B1C47 – 1ST ROW PASSENGER RETRACTOR PRETENSIONER CIRCUIT LOW
• B1C48 – 1ST ROW PASSENGER RETRACTOR PRETENSIONER CIRCUIT HIGH
• B1C49 – 1ST ROW PASSENGER RETRACTOR PRETENSIONER CIRCUIT OPEN
• B1C4A – 1ST ROW PASSENGER RETRACTOR PRETENSIONER CIRCUIT SHORTED TOGETHER
• B2101 – IGNITION RUN/START INPUT CIRCUIT LOW
• B2101 – IGNITION RUN/START INPUT CIRCUIT LOW
• B2102 – IGNITION RUN/START INPUT CIRCUIT HIGH
• B2102 – IGNITION RUN/START INPUT CIRCUIT HIGH
• B210A – SYSTEM VOLTAGE LOW (WCM)
• B210B – SYSTEM VOLTAGE HIGH (WCM)
• B210D – BATTERY VOLTAGE LOW (WCM)
• B210D – BATTERY VOLTAGE LOW
• B210E – BATTERY VOLTAGE HIGH (WCM)
• B210E – BATTERY VOLTAGE HIGH
• B210E – BATTERY VOLTAGE HIGH
• B210E – BATTERY VOLTAGE HIGH
• B212C – IGNITION RUN/START INPUT CIRCUIT OPEN
• B212D – IGNITION RUN ONLY INPUT CIRCUIT OPEN
• B2142 – IGNITION OFF DRAW (IOD) FUSE NOT PRESENT
• B219A – IGNITION UNLOCK RUN/START CONTROL CIRCUIT OVERCURRENT
• B219F – IGNITION OFF DRAW (IOD) FUSE BLOWN
• B2201 – CALIBRATION MISMATCH
• B2204 – ECU CONFIGURATION MISMATCH
• B2205 – ORIGINAL VIN MISSING/MISMATCH
• B2205 – ORIGINAL VIN MISSING/MISMATCH
• B2206 – CURRENT VIN MISSING/MISMATCH
• B2206 – CURRENT VIN MISSING / MISMATCH
• B2206 – CURRENT VIN MISSING / MISMATCH
• B2207 – OCCUPANT RESTRAINT CONTROLLER INTERNAL 1
• B2208 – OCCUPANT RESTRAINT CONTROLLER INTERNAL 2
• B2209 – OCCUPANT RESTRAINT CONTROLLER INTERNAL 3
• B220A – OCCUPANT RESTRAINT CONTROLLER INTERNAL 4
• B220B – OCCUPANT RESTRAINT CONTROLLER FIRING STORED ENERGY
• B220C – OCCUPANT RESTRAINT CONTROLLER ACCELEROMETER 1 INTERNAL
• B220D – OCCUPANT RESTRAINT CONTROLLER ACCELEROMETER 2 INTERNAL
• B2212 – OCCUPANT CLASSIFICATION MODULE INTERNAL
• B2222 – SATELLITE RADIO RECEIVER INTERNAL
• B2224 – SKREEM INTERNAL
• B2229 – SKREEM INTERNAL – SKIM IMMOBILIZER
• B222A – VEHICLE LINE MISMATCH
• B222C – VEHICLE CONFIGURATION NOT PROGRAMMED
• B223B – VEHICLE CONFIGURATION MISMATCH
• B223B – VEHICLE CONFIGURATION MISMATCH
• B223C – INTRUSION TRANSCEIVER MODULE INTERNAL
• B223D – OCCUPANT CLASSIFICATION MODULE DTC PRESENT
• B2254 – COLUMN LOCK MODULE INTERNAL
• B2304 – WIPER PARK SWITCH INPUT CIRCUIT LOW
• B2305 – WIPER PARK SWITCH INPUT CIRCUIT HIGH
• B230D – REAR WIPER PARK SWITCH INPUT CIRCUIT LOW (STUCK LOW)
• B230E – REAR WIPER PARK SWITCH INPUT CIRCUIT HIGH (STUCK HIGH)
• B2323 – HEADLAMP WASHER MOTOR CONTROL CIRCUIT LOW
• B2324 – HEADLAMP WASHER MOTOR CONTROL CIRCUIT HIGH
• B2339 – HORN SWITCH STUCK
• C0077 – LOW TIRE PRESSURE
• C1404 – TRANSFER CASE RANGE POSITION SENSOR CIRCUIT LOW (TIPM)
• C1405 – TRANSFER CASE RANGE POSITION SENSOR CIRCUIT HIGH (TIPM)
• C1417 – FRONT DIFFERENTIAL CONTROL CIRCUIT LOW
• C1418 – FRONT DIFFERENTIAL CONTROL CIRCUIT HIGH
• C141D – REAR DIFFERENTIAL CONTROL CIRCUIT LOW
• C141E – REAR DIFFERENTIAL CONTROL CIRCUIT HIGH
• C1501 – TIRE PRESSURE SENSOR 1 INTERNAL
• C1502 – TIRE PRESSURE SENSOR 2 INTERNAL
• C1503 – TIRE PRESSURE SENSOR 3 INTERNAL
• C1504 – TIRE PRESSURE SENSOR 4 INTERNAL
• C2100 – BATTERY VOLTAGE LOW
• C2101 – BATTERY VOLTAGE HIGH
• C2207 – OFF ROAD ECU INTERNAL
• P0016 – Crankshaft/camshaft Timing Misalignment
• P0031 – O2 Sensor 1/1 Heater Circuit Low
• P0032 – O2 Sensor 1/1 Heater Circuit High
• P0037 – O2 Sensor 1/2 Heater Circuit Low
• P0038 – O2 Sensor 1/2 Heater Circuit High
• P0051 – O2 Sensor 2/1 Heater Circuit Low
• P0052 – O2 Sensor 2/1 Heater Circuit High
• P0057 – O2 Sensor 2/2 Heater Circuit Low
• P0058 – O2 Sensor 2/2 Heater Circuit High
• P0071 – Ambient Air Temperature Sensor Performance
• P0072 – Ambient Air Temperature Sensor Circuit Low
• P0073 – Ambient Air Temperature Sensor Circuit High
• P0107 – Manifold Absolute Pressure Sensor Circuit Low
• P0108 – Manifold Absolute Pressure Sensor Circuit High
• P0111 – Intake Air Temperature Sensor Rationality
• P0112 – Intake Air Temperature Sensor Circuit Low
• P0113 – Intake Air Temperature Sensor Circuit High
• P0116 – Engine Coolant Temperature Sensor Performance
• P0117 – Engine Coolant Temperature Sensor Circuit Low
• P0118 – Engine Coolant Temperature Sensor Circuit High
• P0121 – Throttle Position Sensor 1 Performance
• P0122 – Tps/apps Circuit Low
• P0122 – Throttle Position Sensor 1 Circuit Low
• P0123 – Tps/app Circuit High
• P0123 – Throttle Position Sensor 1 Circuit High
• P0124 – Tps/app Intermittent
• P0125 – Insufficient Coolant Temperature For Closed-loop Fuel Control
• P0128 – Thermostat Rationality
• P0129 – Barometric Pressure Out-of-range Low
• P0131 – O2 Sensor 1/1 Circuit Low
• P0132 – O2 Sensor 1/1 Circuit High
• P0133 – O2 Sensor 1/1 Slow Response
• P0135 – O2 Sensor 1/1 Heater Performance
• P0137 – O2 Sensor 1/2 Circuit Low
• P0138 – O2 Sensor 1/2 Circuit High
• P0139 – O2 Sensor 1/2 Slow Response
• P013a – O2 Sensor 1/2 Slow Response – Rich To Lean
• P013c – O2 Sensor 2/2 Slow Response – Rich To Lean
• P0141 – O2 Sensor 1/2 Heater Performance
• P0151 – O2 Sensor 2/1 Circuit Low
• P0152 – O2 Sensor 2/1 Circuit High
• P0153 – O2 Sensor 2/1 Slow Response
• P0155 – O2 Sensor 2/1 Heater Performance
• P0157 – O2 Sensor 2/2 Circuit Low
• P0158 – O2 Sensor 2/2 Circuit High
• P0159 – O2 Sensor 2/2 Slow Response
• P0161 – O2 Sensor 2/2 Heater Performance
• P0171 – Fuel System 1/1 Lean
• P0172 – Fuel System 1/1 Rich
• P0174 – Fuel System 2/1 Lean
• P0175 – Fuel System 2/1 Rich
• P0201 – Fuel Injector 1 Circuit
• P0202 – Fuel Injector 2 Circuit
• P0203 – Fuel Injector 3 Circuit
• P0204 – Fuel Injector 4 Circuit
• P0205 – Fuel Injector 5 Circuit
• P0206 – Fuel Injector 6 Circuit
• P0218 – High Temperature Operation Activated
• P0221 – Throttle Position Sensor 2 Performance
• P0222 – Throttle Position Sensor 2 Circuit Low
• P0223 – Throttle Position Sensor 2 Circuit High
• P0300 – Multiple Cylinder Misfire
• P0301 – Cylinder 1 Misfire
• P0302 – Cylinder 2 Misfire
• P0303 – Cylinder 3 Misfire
• P0304 – Cylinder 4 Misfire
• P0305 – Cylinder 5 Misfire
• P0306 – Cylinder 6 Misfire
• P0315 – No Crank Sensor Learned
• P0325 – Knock Sensor 1 Circuit
• P0335 – Crankshaft Position Sensor Circuit
• P0339 – Crankshaft Position Sensor Intermittent
• P0340 – Camshaft Position Sensor Circuit
• P0344 – Camshaft Position Sensor Intermittent
• P0401 – Egr System Performance
• P0403 – Egr Solenoid Circuit
• P0404 – Egr Position Sensor Rationality Open
• P0405 – Egr Position Sensor Circuit Low
• P0406 – Egr Position Sensor Circuit High
• P0420 – Catalyst Efficiency (bank 1)
• P0430 – Catalyst Efficiency (bank 2)
• P0440 – General Evap System Failure
• P0441 – Evap Purge System Performance
• P0443 – Evap Purge Solenoid Circuit
• P0452 – Evap Pressure Switch Stuck Closed
• P0455 – Evap Purge System Large Leak
• P0456 – Evap Purge System Small Leak
• P0457 – Loose Fuel Cap
• P0461 – Fuel Level Sensor 1 Performance
• P0462 – Fuel Level Sensor 1 Circuit Low
• P0463 – Fuel Level Sensor 1 Circuit High
• P0480 – Cooling Fan 1 Control Circuit
• P0481 – Cooling Fan 2 Control Circuit
• P0501 – Vehicle Speed Sensor 1 Performance
• P0503 – Vehicle Speed Sensor 1 Erratic
• P0506 – Idle Speed Performance Lower Than Expected
• P0507 – Idle Speed Performance Higher Than Expected
• P050b – Cold Start Ignition Timing Performance
• P050d – Cold Start Rough Idle
• P0513 – Invalid Skim Key
• P0522 – Engine Oil Pressure Too Low
• P0532 – A/c Pressure Sensor Circuit Low
• P0533 – A/c Pressure Sensor Circuit High
• P0562 – Battery Voltage Low
• P0562 – Battery Voltage Low
• P0563 – Battery Voltage High
• P0571 – Brake Switch 1 Performance
• P0572 – Brake Switch 1 Stuck On
• P0573 – Brake Switch 1 Stuck Off
• P0579 – Speed Control Switch 1 Performance
• P0580 – Speed Control Switch 1 Circuit Low
• P0581 – Speed Control Switch 1 Circuit High
• P0585 – Speed Control Switch 1/2 Correlation
• P0591 – Speed Control Switch 2 Performance
• P0592 – Speed Control Switch 2 Circuit Low
• P0593 – Speed Control Switch 2 Circuit High
• P0600 – Serial Communication Link
• P0601 – Internal Memory Checksum Invalid
• P0602 – Control Module Programming Error/not Programmed
• P0602 – Control Module Programming Error/not Programmed
• P0604 – Internal Control Module Ram
• P0605 – Internal Control Module Rom
• P0606 – Internal Ecm Processor
• P060b – Etc A/d Ground Performance
• P060d – Etc Level 2 App Performance
• P060e – Etc Level 2 Tps Performance
• P060f – Etc Level 2 Ect Performance
• P0613 – Internal Transmission Processor
• P061a – Etc Level 2 Torque Performance
• P061c – Etc Level 2 Rpm Performance
• P0622 – Generator Field Control Circuit
• P0627 – Fuel Pump Control Circuit
• P062c – Etc Level 2 Mph Performance
• P0630 – Vin Not Programmed In Pcm
• P0632 – Odometer Not Programmed In Pcm
• P0633 – Skim Secret Key Not Stored In Pcm
• P063a – Generator Voltage Sense Circuit
• P0642 – Sensor Reference Voltage 1 Circuit Low
• P0643 – Sensor Reference Voltage 1 Circuit High
• P0645 – A/c Clutch Control Circuit
• P0652 – Sensor Reference Voltage 2 Circuit Low
• P0653 – Sensor Reference Voltage 2 Circuit High
• P0685 – Auto Shutdown Control Circuit
• P0688 – Auto Shutdown Sense Circuit Low
• P0691 – Cooling Fan 1 Control Circuit Low
• P0692 – Cooling Fan 1 Control Circuit High
• P0693 – Cooling Fan 2 Control Circuit Low
• P0694 – Cooling Fan 2 Control Circuit High
• P0700 – Transmission Control System (mil Request)
• P0703 – Brake Switch 2 Performance
• P0706 – Transmission Range Sensor Rationality
• P0711 – Transmission Temperature Sensor Performance
• P0712 – Transmission Temperature Sensor Low
• P0713 – Transmission Temperature Sensor High
• P0714 – Transmission Temperature Sensor Intermittent
• P0716 – Input Speed Sensor 1 Circuit Performance
• P0721 – Output Speed Sensor Circuit Performance
• P0726 – Engine Speed Input Circuit Range/performance
• P0731 – Gear Ratio Error In 1st
• P0732 – Gear Ratio Error In 2nd
• P0733 – Gear Ratio Error In 3rd
• P0734 – Gear Ratio Error In 4th
• P0736 – Gear Ratio Error In Reverse
• P0740 – Tcc Out Of Range
• P0750 – Lr Solenoid Circuit
• P0755 – 2/4 Solenoid Circuit
• P0760 – Od Solenoid Circuit
• P0765 – Ud Solenoid Circuit
• P0841 – Lr Pressure Switch Rationality
• P0845 – 2/4 Hydraulic Pressure Test
• P0846 – 2/4 Pressure Switch Rationality
• P0850 – Park/neutral Switch Performance
• P0853 – Overdrive/tow Switch Input Circuit Stuck
• P0868 – Line Pressure Low
• P0869 – Line Pressure High
• P0870 – Od Hydraulic Pressure Test
• P0871 – Od Pressure Switch Rationality
• P0882 – Tcm Power Input Low
• P0883 – Tcm Power Input High
• P0884 – Power Up At Speed
• P0888 – Transmission Relay Always Off
• P0890 – Switched Battery
• P0891 – Transmission Relay Always On
• P0897 – Transmission Fluid Deteriorated
• P0933 – Line Pressure Sensor Circuit Performance
• P0934 – Line Pressure Sensor Circuit Low
• P0935 – Line Pressure Sensor Circuit High
• P0944 – Loss Of Hydraulic Pump Prime
• P0992 – 2/4/od Hydraulic Pressure Test
• P1115 – General Temperature Rationality
• P1128 – Closed Loop Fueling Not Achieved – Bank 1
• P1129 – Closed Loop Fueling Not Achieved – Bank 2
• P1273 – A/c Clutch Control Circuit 2 High (tipm)
• P1275 – A/c Clutch Control Circuit 2 Overcurrent (tipm)
• P128b – Tcm Power Control Circuit 2 Low – Tipm
• P128c – Tcm Power Control Circuit 2 High – Tipm
• P128d – Tcm Power Control Circuit 2 Open – Tipm
• P128e – Tcm Power Control Circuit 2 Overcurrent – Tipm
• P129c – Inverter Control Circuit High (tipm)
• P129e – Inverter Control Circuit Overcurrent (tipm)
• P1404 – Egr Position Sensor Rationality Closed
• P1501 – Vehicle Speed Sensor 1/2 Correlation – Drive Wheels
• P1502 – Vehicle Speed Sensor 1/2 Correlation – Non Drive Wheels
• P1572 – Brake Pedal Stuck On
• P1573 – Brake Pedal Stuck Off
• P1593 – Speed Control Switch 1/2 Stuck
• P1602 – Pcm Not Programmed
• P1607 – Pcm Internal Shutdown Timer Rationality Too Slow
• P1618 – Sensor Reference Voltage 1 Circuit Erratic
• P1628 – Sensor Reference Voltage 2 Circuit Erratic
• P1684 – Battery Was Disconnected
• P1696 – Eeprom Memory Write Denied/invalid
• P1697 – Emr (sri) Mileage Not Stored
• P1713 – Restricted Manual Valve In T2 Range
• P1745 – Transmission Line Pressure Too High For Too Long
• P1775 – Solenoid Switch Valve Latched In Tcc Position
• P1776 – Solenoid Switch Valve Latched In Lr Position
• P1790 – Fault Immediately After Shift
• P1794 – Speed Sensor Ground Error
• P1797 – Manual Shift Overheat
• P1897 – Level 1 Rpm Bus Unlock
• P2072 – Electronic Throttle Control System – Ice Blockage
• P2096 – Downstream Fuel Trim System 1 Lean
• P2097 – Downstream Fuel Trim System 1 Rich
• P2098 – Downstream Fuel Trim System 2 Lean
• P2099 – Downstream Fuel Trim System 2 Rich
• P2100 – Electronic Throttle Control Motor Circuit
• P2101 – Electronic Throttle Control Motor Performance
• P2107 – Electronic Throttle Control Module Processor
• P2110 – Electronic Throttle Control – Forced Limited Rpm
• P2111 – Electronic Throttle Control – Unable To Close
• P2112 – Electronic Throttle Control – Unable To Open
• P2115 – Accelerator Pedal Position Sensor 1 Minimum Stop Performance
• P2116 – Accelerator Pedal Position Sensor 2 Minimum Stop Performance
• P2118 – Electronic Throttle Control Motor Current Performance
• P2122 – Accelerator Pedal Position Sensor 1 Circuit Low
• P2123 – Accelerator Pedal Position Sensor 1 Circuit High
• P2127 – Accelerator Pedal Position Sensor 2 Circuit Low
• P2128 – Accelerator Pedal Position Sensor 2 Circuit High
• P2135 – Throttle Position Sensor 1/2 Correlation
• P2138 – Accelerator Pedal Position Sensor 1/2 Correlation
• P2161 – Vehicle Speed Sensor 2 Erratic
• P2166 – Accelerator Pedal Position Sensor 1 Maximum Stop Performance
• P2167 – Accelerator Pedal Position Sensor 2 Maximum Stop Performance
• P2172 – High Airflow / Vacuum Leak Detected (instantaneous Accumulation)
• P2173 – High Airflow / Vacuum Leak Detected (slow Accumulation)
• P2174 – Low Airflow / Restriction Detected (instantaneous Accumulation)
• P2175 – Low Airflow / Restriction Detected (slow Accumulation)
• P2181 – Cooling System Performance
• P2271 – O2 Sensor 1/2 Signal Stuck Rich
• P2273 – O2 Sensor 2/2 Signal Stuck Rich
• P2299 – Brake Pedal Position / Accelerator Pedal Position Incompatible
• P2302 – Ignition Coil 1 Secondary Circuit- Insufficient Ionization
• P2305 – Ignition Coil 2 Secondary Circuit- Insufficient Ionization
• P2308 – Ignition Coil 3 Secondary Circuit- Insufficient Ionization
• P2503 – Charging System Output Low
• P2504 – Charging System Output High
• P2610 – Pcm Internal Shutdown Timer Rationality Too Fast
• U0001 – Can C Bus
• U0001 – Can C Bus
• U0001 – Can C Bus Circuit
• U0002 – Can C Bus Off Performance
• U0010 – Can Interior Bus
• U0010 – Can Interior Bus
• U0011 – Can Interior Bus Off Performance
• U0019 – Can Interior Bus(+)/(-) Circuit
• U0020 – Can Interior Bus Off Performance
• U0100 – Lost Communication With Ecm/pcm
• U0100 – Lost Communication With Ecm/pcm
• U0100 – Lost Communication With Ecm/pcm
• U0100 – Lost Communication With Ecm/pcm
• U0101 – Lost Communication With Tcm
• U0101 – Lost Communication With Tcm
• U0101 – Lost Communication With Tcm
• U0114 – Lost Communication With Final Drive Control Module
• U0114 – Lost Communication With Final Drive Control Module
• U0121 – Lost Communication With Abs
• U0121 – Lost Communication With Anti-lock Brake Module
• U0121 – Lost Communication With Anti-lock Brake System (abs) Control Module
• U0121 – Lost Communication With Anti-lock Brake Module
• U0121 – Lost Communication With Anti-lock Brake Module
• U0121 – Lost Communication With Anti-lock Brake Module
• U0126 – Lost Communication With Sas – Can C (steering Angle Sensor)
• U0141 – Lost Communication With Fcm
• U0141 – Lost Communication With Front Control Module (tipm)
• U0141 – Lost Communication With Front Control Module
• U0141 – Lost Communication With Front Control Module
• U0141 – Lost Communication With Front Control Module (tipm)
• U0141 – Lost Communication With Front Control Module (tipm)
• U0141 – Lost Communication With Front Control Module
• U0146 – Lost Communication With Central Gateway
• U0151 – Lost Communication With Occupant Restraint Controller (orc)
• U0151 – Lost Communication With Occupant Restraint Controller
• U0151 – Lost Communication With Occupant Restraint Controller (orc)
• U0151 – Lost Communication With Occupant Restraint Controller
• U0154 – Lost Communication With Occupant Classification Module
• U0154 – Lost Communication With Occupant Classification Module
• U0154 – Lost Communication With Occupant Classification Module
• U0154 – Lost Communication With Occupant Classification Module
• U0155 – Lost Communication With Cluster/ccn
• U0155 – Lost Communication With Cluster/ccn (skreem)
• U0155 – Lost Communication With Cluster/ccn
• U0155 – Lost Communication With Cluster/ccn
• U0155 – Lost Communication With Cluster/ccn
• U0161 – Lost Communication With Compass Module
• U0164 – Lost Communication With Hvac Control Module
• U0164 – Lost Communication With Hvac Control Module
• U0167 – Lost Communication With Intrusion Transceiver Control Module
• U0167 – Lost Communication With Intrusion Transceiver Control Module
• U0168 – Lost Communication With Vehicle Security Control Module (skreem-wcm)
• U0168 – Lost Communication With Vehicle Security Control Module (skreem/wcm)
• U0168 – Lost Communication With Vehicle Security Control Module (skreem/wcm)
• U0168 – Lost Communication With Vehicle Security Control Module (skreem/wcm)
• U0170 – Lost Communication W/up-front Left Satellite Acceleration Sensor
• U0171 – Lost Communication W/up-front Right Satellite Acceleration Sensor
• U0172 – Lost Communication W/left Side Satellite Acceleration Sensor 1
• U0175 – Communication W/right Side Satellite Acceleration Sensor 1
• U0184 – Lost Communication With Radio
• U0184 – Lost Communication With Radio
• U0184 – Lost Communication With Radio
• U0184 – Lost Communication With Radio
• U0184 – Lost Communication With Radio
• U0186 – Lost Communication With Audio Amplifier
• U0186 – Lost Communication With Audio Amplifier
• U0186 – Lost Communication With Audio Amplifier
• U0186 – Lost Communication With Audio Amplifier
• U0193 – Lost Communication With Traffic Information Receiver Module
• U0195 – Lost Communication With Sdars
• U0195 – Lost Communication With Sdar
• U0197 – Lost Communication With Hands Free Phone Module
• U0197 – Lost Communication With Hands Free Module
• U0199 – Lost Communication With Drivers Door Module
• U0200 – Lost Communication With Passenger Door Module
• U0415 – Implausible Data Received From Abs
• U0447 – Implausible Data Received From Central
• U1008 – Lin 1 Bus
• U1008 – Lin 1 Bus
• U110a – Lost Communication With Scm
• U110c – Lost Fuel Level Message
• U110d – Lost Communication With Security Siren
• U110e – Lost Ambient Temperature Message
• U110f – Lost Fuel Volume Message
• U1110 – Lost Vehicle Speed Message
• U1113 – Lost A/c Pressure Message
• U1120 – Lost Wheel Distance Message
• U113b – Lost Communication With Switch Bank Module
• U1149 – Lost Communication With Multifunction
• U1159 – Lost Communication With Asbs
• U1169 – Lost Communication With Intrusion Sensor 1
• U1170 – Lost Communication With Intrusion Sensor 2
• U1179 – Lost Communication With Intrusion Sensor 3
• U1403 – Implausible Fuel Level Signal Received
• U1411 – Implausible Fuel Volume Signal Received
• U1412 – Implausible Vehicle Speed Signal Received
• U1414 – Implausible/missing Ecu Network Configuration Data
• U1415 – Implausible/missing Vehicle Configuration Data
• U1416 – Implausible Security Siren Signal Received
• U1417 – Implausible Left Wheel Distance Signal Received
• U1418 – Implausible Right Wheel Distance Signal
• U1419 – Implausible Data Received From Ocs Sensor 3 – Left Front
• U141a – Implausible Data Received From Ocs Sensor 2 – Right Front
• U141b – Implausible Data Received From Ocs Sensor 4 – Left Rear
• U141c – Implausible Data Received From Ocs Sensor 1 – Right Rear

Courtesy of JK-Forum.com

Once you have a Diagnostic Trouble Code, you can consult the provided list or use an OBD2 scanner to get a description of the problem. This information empowers you to decide whether to tackle the repair yourself or seek professional assistance from a mechanic or dealership. Understanding your Jeep Wrangler JK’s OBD2 system and how to retrieve and interpret DTCs is a valuable skill for any owner, ensuring proactive vehicle maintenance and informed repair decisions.