| Code | Meaning | Explanation | CEL? |
|---|---|---|---|
| 11 | No Ignition/Crank Reference Signal | No ignition (CPS) reference signal detected during engine cranking | No |
| 12 | Battery Disconnect | Direct Battery Input to Powertrain Control Module (PCM) disconnected in last 50 key-ON cycles | No |
| 13 | Slow change in Idle MAP signal | No variation in MAP sensor signal detected | Yes |
| 13 | No change in MAP from "Start" to "Run" | No difference is recognized between the engine MAP reading and barometric pressure reading at engine startup | Yes |
| 14 | MAP Sensor Voltage Input too High/Low | Manifold Absolute Pressure sensor input voltage outside acceptable range | Yes |
| 15 | No Vehicle Speed Sensor Reading | No distance speed/sensor signal detected during road load conditions | CA Only |
| 17 | Engine is "Cold" too long | Engine Coolant Temperature remains below normal operating temperatures during vehicle travel | No |
| 21 | HEGO Sensor Signal stays at centre | Neither "Rich" nor "Lean" condition detected by Heated Exhuast Gas Oxygen (HEGO) Sensor | CA Only |
| 21 | HEGO Sensor Signal shorted to voltage | HEGO Sensor Input voltage maintained above normal operating range | CA Only |
| 22 | CTS Voltage too High/Low | Coolant Temperature Sensor input voltage outside of acceptable range | Yes |
| 23 | Air Charge Temperature Sensor Voltage too High/Low | Manifold Air Temperature (MAT) sensor input voltage outside acceptable range | Yes |
| 24 | TPS Voltage too High/Low | Throttle Position Sensor (TPS) input voltage outside acceptable range | Yes |
| 25 | Automatic Idle Speed Motor Circuits | An "open" or "shorted" condition detected in one or more of the Idle Air Control (IAC) motor circuits | CA Only |
| 27 | Injector Control Circuit | Injector Output Driver does not respond properly to control signal | Yes |
| 33 | ACC Relay Circuit | An "open" or "short" circuit detected in the Air Conditioning Clutch Relay control circuit | No |
| 34 (XJ/MJ Only) | Speed Control Solenoid Circuits | An "open" or "short" condition detected in the Air Conditioning Clutch Relay control circuit | No |
| 35 (XJ/MJ Only) | Radiator Fan Relay | An "open" or "short" circuit detected in the electric radiator cooling fan relay control circuit | No |
| 41 | Alternator Field not switching properly | Alternator field is not switching properly in response to PCM regulator signal | Yes |
| 42 | ASD Relay Circuit | An "open" or "short" circuit detected in the Auto ShutDown (ASD) Relay control circuit, or no ASD voltage sensed at SBEC/PCM | No |
| 44 | Battery Temperature Sensor Voltage out of limits | Battery Temperature Sensor input voltage out of operational limits | No |
| 46 | Charging System Voltage too high | Charging System Voltage exceeds operational limits | Yes |
| 47 | Charging System Voltage too low | Charging System Voltage below operational limits | Yes |
| 51 | HEGO Sensor Signal Stays "below centre" | HEGO Sensor indicates constant "Lean AFR" condition | CA Only |
| 52 | HEGO Sensor Signal stays "above centre" | HEGO Sensor indicates constant "Rich AFR" condition | CA Only |
| 53 | Internal PCM/SBEC Failure | Internal failure of Powertrain Control Module/Single Board Engine Controller module | No |
| 53 | PCM/SBEC Failure/SPI Communications | No internal communication between co-processors | No |
| 54 | No SYNC pickup signal | No SYNC pickup signal from distributor sensor (Camshaft Position Sensor) | No |
| 62 | Controller Failure/EMR Miles Not Stored | Controller Failure - EMR Miles not stored/writted to EEPROM | No |
| 63 | Controller Failure - EEPROM Write Denied | Attempt to write/store data to controller EEPROM was denied/unsuccessful. | No |
| 76 (XJ/MJ Only) | Fuel Pump Ballast Bypass Relay Circuit | An "open" or "shorted" condition detected in the fuel pump ballast resistor bypass circuit | No |
| 55 | Display Finished | Indicated display of DTC's is finished | N/A |