Decoding Your 2000 Jeep Cherokee OBD2 Codes: A Comprehensive Guide

Understanding the diagnostic systems in your 2000 Jeep Cherokee can save you time and money on car repairs. Like most modern vehicles, the 2000 Jeep Cherokee is equipped with an On-Board Diagnostics system, specifically OBD2, which monitors various aspects of your vehicle’s performance and can alert you to potential problems through diagnostic trouble codes (DTCs). These codes are invaluable for troubleshooting issues, and you don’t always need a professional scan tool to access them. This guide will walk you through understanding and accessing these codes on your 2000 Jeep Cherokee.

Understanding OBD and OBD2 Systems

Before diving into the specifics for your 2000 Jeep Cherokee, it’s helpful to understand the evolution of automotive diagnostic systems. Early Jeep Cherokee models, pre-1990, lacked an OBD port and relied on a system of check engine light flashes to communicate error codes. These early systems were limited in the data they provided.

Vehicles manufactured between 1990 and 1995 featured the first generation OBD-I systems. These offered a step up, providing basic codes and information accessible through a diagnostic port. However, it was with the introduction of OBD-II that standardized and more comprehensive diagnostics became the norm.

Since 1996, including your 2000 Jeep Cherokee, vehicles adopted the OBD-II system. OBD-II offers significantly more detailed information about vehicle systems, emissions, and performance. This system uses a standardized diagnostic port and a broader range of codes, making it easier for mechanics and owners to diagnose problems accurately. The OBD-II port in your 2000 Jeep Cherokee is typically located on the driver’s side under the dashboard, near the steering column.

Accessing OBD2 Codes on Your 2000 Jeep Cherokee

There are two primary methods to retrieve OBD2 codes from your 2000 Jeep Cherokee: using a scan tool and a key-based method which is a handy alternative if you don’t have immediate access to a scanner.

Method 1: Using an OBD2 Scan Tool

The most direct and detailed way to read OBD2 codes is by using an OBD2 scan tool. These tools range from basic code readers to more advanced professional-grade scanners.

Locate the OBD2 Port: For your 2000 Jeep Cherokee, the OBD2 port is typically found under the dashboard on the driver’s side. It’s a 16-pin trapezoidal connector.

Figure 1. The location of the OBD port under the dashboard of a Jeep Cherokee.
Connect the Scan Tool: Plug your OBD2 scan tool into the port.
Turn the Ignition On: Turn your key to the “ON” position but do not start the engine. This provides power to the vehicle’s computer and the scan tool.
Follow Scan Tool Instructions: Most scan tools will power on automatically once connected. Follow the tool’s on-screen prompts to read codes. Typically, you’ll need to select “Read Codes” or a similar option.
Record the Codes: The scan tool will display any stored trouble codes. Note these codes down. They usually start with a letter (P, C, B, or U) followed by four numbers.

Method 2: Key-Based Code Retrieval (Without a Scan Tool)

Chrysler, the manufacturer of Jeep, included a feature in many models, including the 2000 Cherokee, to display error codes through the odometer without needing a scan tool. This method is particularly useful for quick checks when a scan tool isn’t available.

Parking Brake: Ensure your parking brake is engaged for safety.
Ignition Key Cycling: Insert your key into the ignition and perform the following sequence:
- Turn the key to the “ON” position.
- Turn the key to the “OFF” position.
- Turn the key to the “ON” position again.
- Turn the key to the “OFF” position again.
- Finally, turn the key to the “ON” position and leave it there.
Observe the Odometer: After the final “ON” position, watch the odometer display. It will cycle through numbers 1-9, then show the vehicle’s serial number, and subsequently, any stored trouble codes will be displayed. The codes will appear as a series of numbers.
Record the Codes: Write down any codes displayed on the odometer. Note that this method may provide fewer details than a scan tool but is sufficient for retrieving the basic trouble codes.

2000 Jeep Cherokee OBD2 Codes List and Meanings

Once you have retrieved the codes, you’ll need to understand what they mean. OBD2 codes are standardized, but here is a list of common codes that might appear for a 2000 Jeep Cherokee, along with their general descriptions. Note: This is not an exhaustive list, and a professional diagnostic scan and service manual should be consulted for complete accuracy.

OBD-II (Specific Codes)

P0030: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0036: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0106: MAP sensor voltage out of range detected at startup
P0107: MAP sensor voltage too low
P0108: MAP sensor voltage too high
P0112: Intake air temperature sensor voltage low
P0113: Intake air (charge) temperature sensor voltage high
P0116: Coolant temperature sensor reading doesn’t make sense
P0117: Engine coolant temperature sensor voltage low
P0118: Engine coolant temperature sensor voltage high
P0121: Throttle position sensor and MAP sensor disagree with each other
P0122: Throttle position sensor voltage low
P0123: Throttle position sensor voltage high
P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control
P0130: O2 Sensor Circuit Malfunction (Bank 1 Sensor 1)
P0131: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1)
P0132: O2 Sensor Circuit High Voltage (Bank 1 Sensor 1)
P0133: O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
P0134: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
P0135: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
P0136: O2 Sensor Circuit Malfunction (Bank 1 Sensor 2)
P0137: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2)
P0138: O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)
P0139: O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
P0140: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 2)
P0141: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 2)
P0142: O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)
P0143: O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)
P0144: O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)
P0145: O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)
P0146: O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)
P0147: O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 3)
P0151: O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
P0152: O2 Sensor Circuit High Voltage (Bank 2 Sensor 1)
P0153: O2 Sensor Circuit Slow Response (Bank 2 Sensor 1)
P0154: O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
P0155: O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)
P0157: O2 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
P0158: O2 Sensor Circuit High Voltage (Bank 2 Sensor 2)
P0159: O2 Sensor Circuit Slow Response (Bank 2 Sensor 2)
P0160: O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
P0161: O2 Sensor Heater Circuit Malfunction (Bank 2 Sensor 2)
P0171: System Too Lean (Bank 1)
P0172: System Too Rich (Bank 1)
P0174: System Too Lean (Bank 2)
P0175: System Too Rich (Bank 2)
P0176: Flex Fuel Sensor Circuit Malfunction
P0178: Flex Fuel Sensor Circuit Low Input
P0179: Flex Fuel Sensor Circuit High Input
P0182: Fuel Temperature Sensor Circuit Low Input
P0183: Fuel Temperature Sensor Circuit High Input
P0201 – P0208: Injector Circuit Malfunction (Cylinder 1-8)
P0300: Random/Multiple Cylinder Misfire Detected
P0301 – P0308: Cylinder Misfire Detected (Cylinder 1-8)
P0320: Crankshaft Position Sensor Circuit Malfunction
P0325: Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)
P0330: Knock Sensor 2 Circuit Malfunction (Bank 2)
P0340: Camshaft Position Sensor Circuit Malfunction
P0350 – P0358: Ignition Coil Primary/Secondary Circuit Malfunction (Coil A-H)
P0401: Insufficient EGR Flow
P0403: Exhaust Gas Recirculation Control Circuit Malfunction
P0404: Exhaust Gas Recirculation Circuit Range/Performance
P0405: Exhaust Gas Recirculation Sensor Circuit Low
P0406: Exhaust Gas Recirculation Sensor Circuit High
P0412: Secondary Air Injection System Switching Valve A Circuit Malfunction
P0420: Catalyst System Efficiency Below Threshold (Bank 1)
P0432: Catalyst System Efficiency Below Threshold (Bank 2)
P0441: Evaporative Emission Control System Incorrect Purge Flow
P0442: Evaporative Emission Control System Leak Detected (Small Leak)
P0443: Evaporative Emission Control System Purge Control Valve Circuit Malfunction
P0455: Evaporative Emission Control System Leak Detected (Gross Leak)
P0456: Evaporative Emission Control System Leak Detected (Very Small Leak)
P0460: Fuel Level Sensor Circuit Malfunction
P0461: Fuel Level Sensor Circuit Range/Performance
P0462: Fuel Level Sensor Circuit Low Input
P0463: Fuel Level Sensor Circuit High Input
P0500: Vehicle Speed Sensor Circuit Malfunction
P0505: Idle Air Control System Malfunction
P0522: Engine Oil Pressure Sensor/Switch Low Voltage
P0523: Engine Oil Pressure Sensor/Switch High Voltage
P0551: Power Steering Pressure Sensor/Switch Circuit Malfunction
P0600: Serial Communication Link Malfunction
P0601: Internal Control Module Memory Check Sum Error
P0604: Internal Control Module RAM Error
P0605: Internal Control Module ROM Error
P0615: Starter Relay Circuit Malfunction
P0622: Generator Field Control Circuit Malfunction
P0645: A/C Clutch Relay Control Circuit Malfunction
P0700: Transmission Control System Malfunction
P0703: Brake Switch Input Circuit Malfunction
P0711: Transmission Fluid Temperature Sensor Circuit Range/Performance
P0712: Transmission Fluid Temperature Sensor Circuit Low Input
P0713: Transmission Fluid Temperature Sensor Circuit High Input
P0720: Output Shaft Speed Sensor Circuit Malfunction
P0740: Torque Converter Clutch Circuit Malfunction
P0743: Torque Converter Clutch Circuit Electrical
P0748: Pressure Control Solenoid Electrical
P0751: Shift Solenoid A Performance or Stuck Off
P0753: Shift Solenoid A Electrical
P0756: Shift Solenoid B Performance or Stuck Off
P0783: 3-4 Shift Solenoid Circuit Malfunction
P0801: Reverse Inhibit Control Circuit Malfunction
P0833: Clutch Pedal Switch Circuit Malfunction
P1192: Inlet Air Temperature Sensor Circuit Low Input
P1193: Inlet Air Temperature Sensor Circuit High Input
P1194: O2 Sensor Heater Circuit Performance – Bank 1 Sensor 1
P1195: O2 Sensor Slow Response – Bank 1 Sensor 1
P1196: O2 Sensor Slow Response – Bank 2 Sensor 1
P1197: O2 Sensor Slow Response – Bank 1 Sensor 2
P1198: Radiator Coolant Temperature Sensor Circuit Low Input
P1199: Radiator Coolant Temperature Sensor Circuit High Input
P1281: Engine is Cold Too Long
P1282: Fuel Pump Relay Circuit Malfunction
P1288: Manifold Tuning Valve Control Circuit Malfunction
P1289: Manifold Tuning Valve Solenoid Circuit Malfunction
P1290: CNG Pressure Too High
P1291: Heated Air Intake System Malfunction
P1292: Natural Gas Pressure Sensor Voltage Low
P1293: Natural Gas Pressure Sensor Voltage High
P1294: Target Idle Speed Not Reached
P1295: TPS 5 Volt Supply Circuit Malfunction
P1296: MAP Sensor 5 Volt Supply Circuit Malfunction
P1297: MAP Sensor Does Not Change With Throttle Position
P1298: Rich Condition At Wide Open Throttle
P1299: MAP/TPS Inconsistent at Idle
P1388: Auto Shutdown Relay Control Circuit Malfunction
P1389: No ASD Relay Output Voltage At PCM
P1390: Camshaft/Crankshaft Timing Misalignment
P1391: Intermittent Loss of CMP or CKP
P1398: Misfire Detection Monitor Missed 2-Trip Fault
P1399: Wait Lamp Circuit Failure
P1403: EGR Solenoid Circuit
P1476: Secondary Air System Inadequate Flow
P1477: Secondary Air System Excessive Flow
P1478: Battery Temperature Sensor Voltage Out of Range
P1479: Transmission Fan Relay Circuit Malfunction
P1480: PCV Solenoid Circuit Malfunction
P1481: Incorrect Misfire Monitor Signal
P1482: Catalyst Temperature Sensor Short to Low
P1483: Catalyst Temperature Sensor Short to High
P1484: Catalyst Overheating Detected
P1485: Air Pump Relay Control Circuit Malfunction
P1486: Evap System Leak Monitor Pinched Hose Found
P1487: High Speed Fan Relay Control Circuit
P1488: Auxiliary 5-Volt Output Too Low
P1489: High Speed Fan Control Relay Circuit Malfunction
P1490: Low Speed Fan Control Relay Circuit Malfunction
P1491: Radiator Fan Control Relay Circuit Malfunction
P1492: Ambient/Battery Temperature Sensor Voltage Too High
P1493: Ambient/Battery Temperature Sensor Voltage Too Low
P1494: Leak Detection Pump Switch or Mechanical Fault
P1495: Leak Detection Pump Solenoid Circuit
P1496: 5 Volt Output Below Limit
P1498: High Speed Fan Relay Control Circuit #3
P1594: Charging System Voltage Too High
P1595: Speed Control Vacuum Solenoid Circuit Malfunction
P1596: Speed Control Switch Always High
P1597: Speed Control Switch Always Low
P1598: A/C Pressure Sensor Voltage High
P1599: A/C Pressure Sensor Voltage Low
U1681: No Cluster Controller BUS Message
U1682: Charging System Voltage Not Available
U1683: Speed Control Servo Power Problem
U1684: Battery Disconnect/System Reset Recent Memory Cleared
U1685: Invalid SKIM Key
U1686: No SKIM BUS Message Received
U1687: No MIC BUS Message

Clearing OBD2 Codes on Your 2000 Jeep Cherokee

After diagnosing and repairing the issue indicated by the OBD2 code, you’ll want to clear the code and turn off the check engine light.

Using a Scan Tool: Most OBD2 scan tools have a “Clear Codes” or similar function. Follow the tool’s prompts to erase the stored codes.
Battery Disconnect Method: A simpler method is to disconnect the negative battery cable.
- Locate the negative terminal on your Jeep Cherokee’s battery (it’s usually black and marked with a “-” sign).
- Use a wrench (typically 10mm or 12mm) to loosen the nut on the negative battery cable clamp.
- Disconnect the cable from the terminal.
- Wait for at least five minutes to ensure the vehicle’s computer resets.
- Reconnect the negative battery cable and tighten the nut.

Important Note: Clearing codes without addressing the underlying issue will only result in the code and check engine light reappearing. Always diagnose and repair the problem before clearing codes.

When to Seek Professional Help

While reading and understanding OBD2 codes can empower you to perform basic diagnostics and repairs on your 2000 Jeep Cherokee, some situations warrant professional assistance. If you are uncomfortable performing car repairs, if the problem is complex, or if the codes persist after your attempts to fix the issue, it’s always best to consult a qualified mechanic. They have advanced diagnostic tools and expertise to accurately pinpoint and resolve more intricate automotive problems.

By understanding how to access and interpret the 2000 Jeep Cherokee Obd2 Codes, you can take a proactive approach to vehicle maintenance, ensuring your Jeep runs smoothly and efficiently for years to come.