| P0101 | Mass Airflow Sensor Circuit Range/Performance | Plugged Air Filter, Plugged Exhaust, Air Intake Leak, MAF Sensor Failure, Throttle Control Malfunction, Barometric Pressure Sensor Malfunction (Integral With ECM), Crankshaft Position Sensor Failure, Open Or Short Circuit, ECM Failure |
| P0102 | Mass Airflow Sensor Circuit Voltage Low | Open Or Short Circuit, ECM Failure, MAF Sensor Failure |
| P0103 | Mass Airflow Sensor Circuit Voltage High | Open Or Short Circuit, MAF Sensor Failure, ECM Failure |
| P0111 | Intake Air Temperature Sensor Range/Performance | Plugged Air Filter, Air Intake Leak, Open Or Short Circuit, IAT Sensor Failure |
| P0112 | IAT Sensor Circuit Voltage High | IAT Sensor Circuit Open Or Short To Voltage, IAT Sensor Failure |
| P0113 | IAT Sensor Circuit Voltage Low | IAT Sensor Circuit Short To Ground, IAT Sensor Failure |
| P0116 | Engine Coolant Temperature Sensor Range/Performance | Low Coolant Level, Thermostat Stuck Open, ECT Sensor Circuit Open, ECT Sensor Failure |
| P0117 XJ | ECT Sensor Voltage High | ECT Sensor Circuit Open Or Shorted, ECT Sensor Open |
| P0117 XK8 | ECT Sensor Voltage High | ECT Sensor Circuit Open Or Shorted, ECT Sensor Open |
| P0118 XJ | ECT Sensor Voltage Low | ECT Sensor Circuit Open Or Shorted, ECT Sensor Shorted |
| P0118 XK8 | ECT Sensor Voltage Low | ECT Sensor Circuit Open Or Shorted, ECT Sensor Shorted |
| P0121 | Throttle Position Sensor "A" Circuit Range | TP Sensor Output Constant Or Out Of Limits, TP Sensor Circuit Open |
| P0122 | TP Sensor "A" Low Input | TP Sensor Circuit Open, TP Sensor Open, ECM Failure |
| P0123 | TP Sensor "A" High Input | TP Sensor Short To Voltage, TP Sensor Circuit Shorted, ECM Failure |
| P0125 | Insufficient Coolant Temperature For Closed Loop Fuel Control | Low Coolant Level, Thermostat Stuck Open, ECT Sensor Failure, ECT Sensor Circuit Open |
| P0131 | Front HO2S Circuit Voltage Low ("A" Bank) | HO2S Failure, Sensor Ground Fault, Harness Or Connector Fault |
| P0132 | Front HO2S Circuit Voltage High ("A" Bank) | HO2S Short To Voltage, Sensor Ground Fault, Harness Or Connector Fault, HO2S Failure |
| P0133 | Front HO2S Slow Response ("A" Bank) | HO2S Heater Failure, Sensor Ground Fault, Harness Or Connector Fault, Low Exhaust Temperature, HO2S Failure |
| P0135 | Front HO2S Heater Circuit Malfunction ("A" Bank) | HO2S Failure, Harness Or Connector Fault, ECM Failure |
| P0137 | Rear O2 Circuit Voltage Low ("A" Bank) | Sensor Failure, Sensor Ground Fault, Harness Or Connector Fault |
| P0138 | Rear O2 Circuit Voltage High ("A" Bank) | Sensor Short To Voltage, Sensor Ground Fault, Harness Or Connector Fault, ECM Failure |
| P0140 | Rear O2 No Activity ("A" Bank) | Sensor Failure, Sensor Ground Fault, Harness Or Connector Fault, Low Exhaust Temperature |
| P0151 | Front HO2S Circuit Voltage Low ("B" Bank) | HO2S Failure, Sensor Ground Fault, Harness Or Connector Fault |
| P0152 | Front HO2S Circuit Voltage High ("B" Bank) | HO2S Short To Voltage, Sensor Ground Fault, Harness Or Connector Fault, HO2S Failure |
| P0153 | Front HO2S Slow Response ("B" Bank) | HO2S Heater Failure, Sensor Ground Fault, Harness Or Connector Fault, Low Exhaust Temperature, HO2S Failure |
| P0155 | Front HO2S Heater Circuit Malfunction ("B" Bank) | HO2S Failure, Harness Or Connector Fault, ECM Failure |
| P0157 | Rear O2 Circuit Voltage Low ("B" Bank) | Sensor Failure, Sensor Ground Fault, Harness Or Connector Fault |
| P0158 | Rear O2 Circuit Voltage High ("B" Bank) | Sensor Short To Voltage, Sensor Ground Fault, Harness Or Connector Fault, ECM Failure |
| P0160 | Rear O2 No Activity ("B" Bank) | Sensor Failure, Sensor Ground Fault, Harness Or Connector Fault, Low Exhaust Temperature |
| P0171 | System Too Lean ("A" Bank) | Low Fuel Pressure, Fuel Delivery System Blockage, Faulty Fuel Injector, Air Intake Leak, ECT Sensor Fault, MAF Sensor Fault, IAT Sensor Fault, TP Sensor Fault |
| P0172 | System Too Rich ("A" Bank) | High Fuel Pressure, Faulty Fuel Injector, Air Intake Restricted, ECT Sensor Fault, MAF Sensor Fault, IAT Sensor Fault, TP Sensor Fault |
| P0174 | System Too Lean ("B" Bank) | Low Fuel Pressure, Fuel Delivery System Blockage, Faulty Fuel Injector, Air Intake Leak, ECT Sensor Fault, MAF Sensor Fault, IAT Sensor Fault, TP Sensor Fault |
| P0175 | System Too Rich ("B" Bank) | High Fuel Pressure, Faulty Fuel Injector, Air Intake Restricted, ECT Sensor Fault, MAF Sensor Fault, IAT Sensor Fault, TP Sensor Fault |
| P0201 | No. 1 Injector Circuit (Cylinder No. 1A) | Open Or Short In Fuel Injector Or Circuit, ECM Failure |
| P0202 | No. 2 Injector Circuit (Cylinder No. 2A) | Open Or Short In Fuel Injector Or Circuit, ECM Failure |
| P0203 | No. 3 Injector Circuit (Cylinder No. 3A) | Open Or Short In Fuel Injector Or Circuit, ECM Failure |
| P0204 | No. 4 Injector Circuit (Cylinder No. 4A) | Open Or Short In Fuel Injector Or Circuit, ECM Failure |
| P0205 | No. 5 Injector Circuit (Cylinder No. 1B) | Open Or Short In Fuel Injector Or Circuit, ECM Failure |
| P0206 | No. 6 Injector Circuit (Cylinder No. 2B) | Open Or Short In Fuel Injector Or Circuit, ECM Failure |
| P0207 | No. 7 Injector Circuit (Cylinder No. 3B) | Open Or Short In Fuel Injector Or Circuit, ECM Failure |
| P0208 | No. 8 Injector Circuit (Cylinder No. 4B) | Open Or Short In Fuel Injector Or Circuit, ECM Failure |
| P0222 | Throttle Position Sensor "B" Low Input | TP Sensor Or Circuit Open, ECM Failure |
| P0223 | Throttle Position Sensor "B" High Input | TP Sensor Or Circuit Shorted, ECM Failure |
| P0300 | Random Misfire Detected | Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure |
| P0301 | Misfire Cylinder No. 1 Detected | Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure |
| P0302 | Misfire Cylinder No. 2 Detected | Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure |
| P0303 | Misfire Cylinder No. 3 Detected | Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure |
| P0304 | Misfire Cylinder No. 4 Detected | Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure |
| P0305 | Misfire Cylinder No. 5 Detected | Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure |
| P0306 | Misfire Cylinder No. 6 Detected | Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure |
| P0307 | Misfire Cylinder No. 7 Detected | Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure |
| P0308 | Misfire Cylinder No. 8 Detected | Fuel Contamination, Leaking Or Blocked Fuel Injector(s), Faulty Ignition System, Low Fuel Pressure, Engine Mechanical Failure |
| P0327 | No. 1 Knock Sensor Low Input | Faulty Sensor, Poor Sensor Contact With Cylinder Block, Harness Or Connector Fault, ECM Failure |
| P0328 | No. 1 Knock Sensor High Input | Faulty Sensor, Poor Sensor Contact With Cylinder Block, Harness Or Connector Fault, ECM Failure |
| P0332 | No. 2 Knock Sensor Low Input | Faulty Sensor, Poor Sensor Contact With Cylinder Block, Harness Or Connector Fault, ECM Failure |
| P0333 | No. 2 Knock Sensor High Input | Faulty Sensor, Poor Sensor Contact With Cylinder Block, Harness Or Connector Fault, ECM Failure |
| P0335 | Crankshaft Position Sensor Circuit | Sensor Failure, Sensor Gap Incorrect, Foreign Matter On Sensor, Harness Or Connector Fault |
| P0340 | Camshaft Position Sensor Circuit | Sensor Failure, Sensor Gap Incorrect, Foreign Matter On Sensor, Harness Or Connector Fault |
| P0351 | Ign. Coil No. 1A Primary/Secondary Circuit Malfunction | Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure |
| P0352 | Ign. Coil No. 2A Primary/Secondary Circuit Malfunction | Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure |
| P0353 | Ign. Coil No. 3A Primary/Secondary Circuit Malfunction | Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure |
| P0354 | Ign. Coil No. 4A Primary/Secondary Circuit Malfunction | Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure |
| P0355 | Ign. Coil No. 1B Primary/Secondary Circuit Malfunction | Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure |
| P0356 | Ign. Coil No. 2B Primary/Secondary Circuit Malfunction | Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure |
| P0357 | Ign. Coil No. 3B Primary/Secondary Circuit Malfunction | Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure |
| P0358 | Ign. Coil No. 4B Primary/Secondary Circuit Malfunction | Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, ECM Failure |
| P0400 (1) | EGR Flow Malfunction | EGR Flow Insufficient Or Excessive, EGR Valve Failure, Connector Failure, ECM Failure |
| P0405 (1) | EGR Sensor Circuit Low Input | Open Circuit In EGR Valve Or Circuit, ECM Failure |
| P0406 (1) | EGR Sensor Circuit High Input | Short Circuit In EGR Valve Or Circuit, ECM Failure |
| P0420 | Catalyst Efficiency Below Threshold "A" Bank | HO2S/O2 Failure, Catalyst Failure |
| P0430 | Catalyst Efficiency Below Threshold "B" Bank | HO2S/O2 Failure, Catalyst Failure |
| P0441 (2) | EVAP Control System Incorrect Purge Flow | Purge Valve Failure, Purge Line Blockage Or Leak |
| P0442 (3) | EVAP Control System Leak | Fuel Cap Missing Or Leaking, Canister Or Hose Leaking, CCV Failure, Purge Valve Or Vacuum Hose Failure |
| P0444 XJ | EVAP Control System Purge Valve Open Circuit | Harness Or Connector Failure, Purge Valve Failure |
| P0444 XK8 | EVAP Control System Purge Valve Open Circuit | Harness Or Connector Failure, Purge Valve Failure |
| P0445 XJ | EVAP Control System Purge Valve Short Circuit | Harness Or Connector Failure, Purge Valve Failure |
| P0445 XK8 | EVAP Control System Purge Valve Short Circuit | Harness Or Connector Failure, Purge Valve Failure |
| P0447 | EVAP Control System Open CCV Circuit | Harness Or Connector Failure, CCV Failure |
| P0448 | EVAP Control System Shorted CCV Circuit | Harness Or Connector Failure, CCV Failure |
| P0452 | FTP Sensor Low Input | FTP Sensor Disconnected, Harness Or Connector Fault, FTP Sensor Failure |
| P0453 | FTP Sensor High Input | Open Or Short To Voltage In Harness Or Connector, FTP Sensor Failure |
| P0460 | Fuel Level Sensor Circuit Malfunction | Harness Or Connector Fault, Fuel Level Sensor Failure, Instrument Cluster Fault |
| P0506 | ISC System (Low RPM) | Throttle Valve Stuck Closed, Electronic Throttle Body Failure, Air Intake Blockage, A/C Compressor Seized, ECM Failure |
| P0507 | ISC System (High RPM) | Throttle Valve Stuck Open, Electronic Throttle Body Failure, Air Intake Leak, Cruise Control Vacuum System Failure, ECM Failure |
| P0560 | System Voltage Malfunction | Charging System Fault, Harness Or Connector Fault |
| P0566 | Cruise Control Cancel Switch On Fault | (4) |
| P0567 | Cruise Control Resume Switch On Fault | (4) |
| P0568 | Cruise Control Switch Ground Malfunction | (4) |
| P0569 | Cruise Control Decel/Set Switch On Fault | (4) |
| P0570 | Cruise Control Accel/Set Switch On Fault | (4) |
| P0603 | ECM Data Corrupted | ECM Failure |
| P0702 | Transmission Control System Electrical | (5) |
| P0705 (1) | Transmission Range Sensor Performance | (5) |
| P0706 | Transmission Range Sensor Performance | (5) |
| P0710 | Transmission Fluid Temperature Sensor Malfunction | (5) |
| P0715 | Transmission Input/Turbine Speed Sensor Circuit Malfunction | (5) |
| P0721 | Transmission Output Speed Sensor Malfunction | (5) |
| P0730 (1) | Incorrect Gear Ratio | (5) |
| P0740 (1) | Torque Converter Clutch Circuit Malfunction | (5) |
| P0741 | Torque Converter Clutch System Performance Or Stuck Off | (5) |
| P0742 | Torque Converter Clutch System Stuck On | (5) |
| P0743 | Torque Converter Clutch System Electrical | (5) |
| P0748 (1) | Pressure Control Solenoid Electrical | (5) |
| P0753 | Transmission Shift Solenoid "A" Electrical | (5) |
| P0758 | Transmission Shift Solenoid "B" Electrical | (5) |
| P0763 | Transmission Shift Solenoid "C" Electrical | (5) |
| P0780 (1) | Shift Malfunction | (5) |
| P0790 | Normal/Performance Mode Circuit Malfunction | (5) |
| P1000 | Transmission System Check Not Complete Since Last Memory Clear | (5) |
| P1104 | MAF Sensor Ground Circuit Malfunction | Sensor Open, Harness Or Connector Fault, ECM Failure |
| P1112 (1) | IAT Sensor No. 2 Circuit High Voltage | IAT Sensor Circuit Open Or Short To Voltage, IAT Sensor Failure |
| P1113 (1) | IAT Sensor No. 2 Circuit Low Voltage | IAT Sensor Circuit Short To Ground, IAT Sensor Failure, Intercooler Failure |
| P1121 | Pedal Position Sensor "A" Circuit Range/Performance | (6) |
| P1122 | Pedal Position Sensor "A" Circuit Low Input | (6) |
| P1123 | Sensor "A" Circuit High Input | (6) |
| P1221 | Pedal Position Sensor "B" Circuit Range/Performance | (6) |
| P1222 | Pedal Position Sensor "B" Circuit Low Input | (6) |
| P1223 | Pedal Position Sensor "B" Circuit High Input | (6) |
| P1224 | Electronic Throttle Control Position Error | Electronic Throttle Failure, Throttle Motor Failure, Throttle Motor Power Relay Fault, ECM Ground Fault, ECM Failure |
| P1226 | Mechanical Guard Circuit Range/Performance | Actuator Seized, Broken Spring, Sensor Out Of Range, Harness Or Connector Fault, ECM Failure |
| P1227 | Mechanical Guard Circuit Low Input | Sensor Failure, Open Circuit, Connector Fault, ECM Failure |
| P1228 | Mechanical Guard Circuit High Input | Sensor Failure, Short Circuit, Connector Fault, ECM Failure |
| P1229 | Electronic Throttle Control Circuit Malfunction | ECM Failure |
| P1230 | Fuel Pump Relay Malfunction | Relay Failure, Harness Or Connector Fault, Ground Fault |
| P1235 | VSV Circuit Range/Performance | (4) |
| P1236 | VSV VV Circuit | (4) |
| P1237 | VSV VA Circuit | (4) |
| P1238 | VSV VR Circuit | (4) |
| P1240 | Sensor Power Supply Malfunction | Mechanical Guard Sensor Short, Pedal Demand Sensor Short, TP Sensor Short, Harness Or Connector Fault, ECM Failure |
| P1241 | Sensor Power Supply Low Input | ECM Sensor Supply Fault, Harness Or Connector Fault, ECM Failure |
| P1242 | Sensor Power Supply High Input | ECM Sensor Supply Fault, Harness Or Connector Fault, ECM Failure |
| P1243 | Analog Ground Malfunction | Mechanical Guard Sensor Failure, Pedal Demand Sensor Failure, Open Ground Circuit, ECM Failure |
| P1245 | Crank Signal Low Input | Sensor Or Harness Short, ECM Or BPM Failure |
| P1246 | Crank Signal High Input | Sensor Or Harness Open Circuit, ECM Or BPM Failure |
| P1250 | Throttle Valve Spring Malfunction | (6) |
| P1251 | Throttle Position | (6) |
| P1252 | VSV Stuck On VA/VV | (4) |
| P1253 | VSV Stuck On VR | (4) |
| P1260 | Security Input Malfunction | (6) |
| P1313 | Catalyst Damage Misfire ("A" Bank) | See DTC P0300 |
| P1314 | Catalyst Damage Misfire ("B" Bank) | See DTC P0300 |
| P1316 | Misfire Rate Excess Emissions | See DTC P0300 |
| P1336 | Crankshaft/Camshaft Position Sensor Performance | Sensor Failure, Sensor Gap Incorrect, Foreign Matter On Sensor, Harness Or Connector Fault |
| P1367 | Ignition System Failure (Group 1) | Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, Ignition Module No. 1 Failure, ECM Failure |
| P1368 | Ignition System Failure (Group 2) | Open Or Shorted Ignition Coil, Harness Or Connector Fault, Ignition Circuit Ground Fault, Ignition Module No. 1 Failure, ECM Failure |
| P1392 | VVT Solenoid Circuit Low Input ("A" Bank) | VVT Solenoid Or Circuit Open |
| P1393 | VVT Solenoid Circuit High Input ("A" Bank) | VVT Solenoid Or Circuit Shorted |
| P1396 | VVT Solenoid Malfunction ("B" Bank) | Oil Pressure Low, VVT Solenoid Sticking, CKP Sensor Failure, Connector Fault, ECM Failure |
| P1397 | VVT Solenoid Circuit Low Input ("B" Bank) | VVT Solenoid Or Circuit Open |
| P1398 | VVT Solenoid Circuit High Input ("B" Bank) | VVT Solenoid Or Circuit Shorted |
| P1474 (1) | Intercooler Coolant Pump Relay Malfunction | Relay Failure, Relay To ECM Drive Circuit, Relay Coil Ground Circuit, ECM Power Supply Fault |
| P1475 | Radiator Fans Slow, Low Input/High Input | (6) |
| P1476 | Radiator Fans Fast, Low Input/High Input | (6) |
| P1516 | Transmission Park/Neutral Driving Malfunction | Gearshift Cable Misadjusted, Rotary Switch Failure, Harness Or Connector Fault |
| P1517 | Transmission Park/Neutral Starting Malfunction | (6) |
| P1571 | Brake Switch Malfunction | (6) |
| P1601 (1) | Internal Control Module Computer Error | (5) |
| P1606 | EMS Control Relay Malfunction | ECM Control Relay Failure, ECM Control Relay To ECM Circuit Fault, ECM Control Relay Coil Power Supply Open Circuit, ECM Ground Circuit Fault |
| P1608 | Transmission Watchdog Malfunction | (5) |
| P1609 | ECM Internal CPU-To-CPU Communication Failure | ECM Flash Programming Circuit Shorted, ECM Failure |
| P1611 | Throttle Angle Malfunction | TPS Circuit Fault, Pedal Position Sensor Fault, Throttle Assembly Failure, ECM Failure |
| P1612 | Throttle Offset Malfunction | TPS Circuit Fault, Pedal Position Sensor Fault, Throttle Assembly Failure, ECM Failure |
| P1637 | CAN Link/ABS Circuit/Network Malfunction | (7) |
| P1638 | CAN Link ECM/INSTCM Circuit/Network Malfunction | (7) |
| P1642 | CAN Link Circuit Malfunction | (7) |
| P1643 | CAN Link ECM/TCM Circuit/Network Malfunction | (7) |
| P1646 (1) | Secondary Fuel Pump Relay Malfunction | Relay Failure, Harness Or Connector Fault, Ground Failure |
| P1720 | Loss Of Output Speed & Wheel Information | (5) |
| P1722 | Transmission Stall Speed | (5) |
| P1726 | Engine Overspeed Malfunction | (5) |
| P1730 | Gear Control Malfunction (2, 3, 5) | (5) |
| P1731 | Inconsistent Gear Ratio | (5) |
| P1734 | Gear Control Malfunction (4) | (5) |
| P1744 | Torque Converter Clutch Heat Control | (5) |
| P1745 | Transmission Pressure Regulator No. 1 Malfunction | (5) |
| P1746 | Transmission Pressure Regulator No. 2 Malfunction | (5) |
| P1747 | Transmission Pressure Regulator No. 3 Malfunction | (5) |
| P1748 | Transmission Pressure Regulator No. 4 Malfunction | (5) |
| P1779 | Transmission (Gearshift) Load Control Malfunction | (5) |
| P1789 | Ignition Supply Malfunction | (5) |
| P1793 | Ignition Supply Malfunction | (5) |
| P1794 | Battery Supply Malfunction | (6) |
| P1795 | Inconsistent CAN Level | (7) |
| P1796 | CAN Controller Circuit Malfunction (Bus Off) | (7) |
| P1797 | CAN TCM/ECM Malfunction | (7) |
| P1798 | CAN TCM/INST Circuit Malfunction | (7) |
| P1799 | CAN/TCM ABS Circuit Malfunction | (7) |
| (1) XJR only. (2) XK8 only. (3) XJR & XJ8 only. (4) See appropriate CRUISE CONTROL SYSTEMS article in ACCESSORIES & EQUIPMENT. (5) See DIAGNOSIS - 5HP24, 5R55N & W5A580 article in AUTOMATIC TRANSMISSIONS. (6) Information is not available from manufacturer. (7) See appropriate MODULE COMMUNICATIONS NETWORK article in ACCESSORIES & EQUIPMENT. |
