Understanding your Jeep Grand Cherokee’s On-Board Diagnostics (OBD2) codes is crucial for diagnosing and resolving vehicle issues. This guide provides a comprehensive list of OBD2 codes for various Jeep Grand Cherokee models, empowering you to troubleshoot problems effectively.
Understanding Jeep Grand Cherokee OBD2 Codes
OBD2 codes are standardized alphanumeric codes that indicate specific malfunctions within your vehicle’s systems. When your Jeep Grand Cherokee’s Check Engine Light illuminates, it signals a potential problem that has triggered an OBD2 code. Accessing these codes, typically through an OBD2 scanner, reveals the nature of the issue.
Jeep Grand Cherokee OBD2 Codes by Engine Type
Carbureted Engines
- Code 12: No distributor reference pulses to the ECM.
- Code 13: Oxygen sensor circuit issue.
- Code 14: Coolant sensor circuit shorted.
- Code 15: Coolant sensor circuit open.
- Code 21: Throttle position sensor circuit issue.
- Code 23: Mixture control solenoid circuit shorted or open.
- Code 34: Vacuum sensor circuit issue.
- Code 41: No distributor reference pulses at specific manifold vacuum.
- Code 42: Electronic Spark Timing (EST) circuit issue.
- Code 44: Lean exhaust indication.
- Code 45: Rich exhaust indication. Codes 44 and 45 together indicate a potential oxygen sensor problem.
- Code 51: Faulty PROM or installation.
- Code 54: Mixture Control (MC) solenoid circuit shorted or faulty ECM.
- Code 55: Voltage reference short to ground, faulty oxygen sensor, or faulty ECM.
Fuel Injected Engines (Except 1991 and Later)
This generation utilizes a three-digit code system, with codes ranging from 1000 to 1223. These codes cover a wider array of components, including:
- Ignition System: Codes 1000, 1001.
- Oxygen Sensor: Code 1002.
- Battery Voltage: Code 1004.
- Sensor Ground: Code 1005.
- Diagnostic Enable Line: Codes 1010, 1011.
- MAP Sensor: Codes 1012, 1013, 1052, 1053, 1222.
- Fuel Pump: Codes 1014, 1015.
- Charge Air Temperature Sensor: Codes 1016, 1017.
- Serial Data: Code 1018.
- Starting System: Codes 1021, 1022, 1024.
- Throttle Position: Codes 1025, 1027, 1028, 1031, 1032, 1037.
- Idle Speed Control: Codes 1033, 1034, 1035, 1036, 1050, 1051.
- Park/Neutral Line: Code 1038.
- B+ Line: Codes 1040, 1041, 1042.
- ECU: Codes 1047, 1048, 1049, 1200.
- Coolant Temperature Sensor: Codes 1054, 1055, 1056.
- Knock Sensor: Codes 1057, 1058.
- A/C System: Codes 1059, 1060, 1061, 1062, 1063, 1064, 1070, 1071.
- Oxygen Sensor Reading: Codes 1065, 1066.
- Latch Relay: Codes 1067, 1068.
- Speed Sensor: Code 1073.
- Injector Circuit: Codes 1202, 1209, 1221.
- Power and EGR Systems: Codes 1218, 1220.
- Diagnostic Tests: Code 1223.
1991-1995 Models
These models use two-digit codes (11-88) and cover areas similar to the previous generation, with additions like camshaft position sensors and specific injector circuits. Code 55 signifies the end of the code sequence. Code 88 indicates the start of the test.
1996 and Later Models
These models utilize the standardized P-codes (e.g., P0107, P0300). These codes provide more detailed diagnostic information across all vehicle systems, including:
- Powertrain: P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0129, etc.
- Fuel and Air Metering: P0131, P0132, P0133, P0135, P0137, P0138, P0141, P0152, P0171, P0172.
- Emissions: P0420, P0441, P0442, P0443, P0455.
- Fuel System: P0460, P0462, P0463.
- Vehicle Speed Control: P0500, P0505.
- Computer and Output Circuit: P0600, P0601, P0622, P0645.
- Transmission: P0711, P0712, P0713, P0720, P0740, P0743, P0748, P0751, P0753, P0783.
- Miscellaneous: P1195, P1197, P1281, P1282, P1294, P1296, P1297, P1388, P1389, P1391, P1398, P1486, P1492, P1493, P1494, P1495, P1594, P1595, P1596, P1597, P1683, P1696, P1698, P1756, P1757, P1762, P1763, P1764, P1765, P1899.
Conclusion
This comprehensive guide to Jeep Grand Cherokee Obd2 Codes provides a starting point for diagnosing vehicle problems. Remember to use an OBD2 scanner to retrieve the specific codes and consult a repair manual or qualified technician for accurate diagnosis and repair. Properly interpreting these codes can save you time and money in resolving your Jeep Grand Cherokee’s issues.
