| Scan code | Fault location | Probable cause |
| PO, P2,UO | Refer to OBO-II trouble code tables | – |
| P1004 | Intake manifold air control valve (short runner) -performance | Automatic shut-down (ASO) relay circuit open/short, control circuit short circuit to ground, control circuit open, intake manifold air control valve, ECM |
| P1005 | Intake manifold air valve control -performance | Wiring short/open circuit, intake manifold air valve, ECM |
| P1105 | Turbocharger (TC) boost pressure actuator circuit malfunction | Wiring, TC boost pressure actuator |
| P1106 | Turbocharger (TC) boost pressure actuator range/performance problem | Hose connection(s), wiring, TC wastegate regulating valve, TC boost pressure actuator, TC control solenoid, TC boost pressure sensor, TC wastegate, turbocharger |
| P1115 | Engine coolant temperature (ECT) sensor/ intake air temperature (IAT) sensor/outside airtemperature sensor -signal variation | Wiring, ECT sensor, IAT sensor, outside air temperature sensor, ECM |
| P1128 | Closed loop fuel control not achieved -bank 1 | Wiring, H02S, fuel system, MAP sensor, ECM |
| P1129 | Closed loop fuel control not achieved -bank 2 | Wiring, H02S, fuel system, MAP sensor, ECM |
| P1187 | Turbocharger (TC) boost pressure sensorrange/performance problem | Hose connection(s), wiring, TC wastegate regulating valve, TC boost pressure actuator, TC control solenoid, TC boost pressure sensor, TC wastegate, turbocharger, ECM |
| P1188 | Turbocharger (TC) boost pressure sensorrange/performance problem | Hose connection(s), wiring, TC wastegate regulating valve, TC boost pressure actuator, TC control solenoid, TC boost pressure sensor, TC wastegate, turbocharger |
| P1189 | Turbocharger (TC) boost pressure sensor-voltage low | Wiring, TC boost pressure sensor, ECM |
| P1190 | Turbocharger (TC) boost pressure sensorvoltage high | Wiring, TC boost pressure sensor, ECM |
| P1239 | Engine oil temperature (EOT) -temperature too low | Engine oil, wiring, EOT sensor, ECM |
| P1272 | AlC compressor clutch control circuit 2 voltagelow | Wiring, AlC compressor clutch, multifunction control module, ECM |
| P1273 | AlC compressor clutch control circuit 2 voltage high | Wiring, AlC compressor clutch, multifunction control module, ECM |
| P1274 | AlC compressor clutch control circuit 2 -open circuit | Wiring, AlC compressor clutch, multifunction control module, ECM |
| P1275 | AlC compressor clutch control circuit 2 -circuit malfunction | Wiring, AlC compressor clutch, multifunction control module, ECM |
| P1277 | Starter motor control circuit -voltage low | Wiring, starter motor, starter motor relay, multifunction control module, ECM |
| P1278 | Starter motor control circuit -voltage high | Wiring, starter motor, starter motor relay, multifunction control module, ECM |
| P1279 | Starter motor control circuit -open circuit | Wiring, starter motor, starter motor relay, multifunction control module, ECM |
| P127A | Starter motor control circuit -circuit malfunction | Wiring, starter motor, starter motor relay, multifunction control module, ECM |
| P127C | Fuel pump control circuit -voltage low | Wiring, fuel pump, multifunction control module, ECM |
| P127D | Fuel pump control circuit -voltage high | Wiring, fuel pump, multifunction control module, ECM |
| P127E | Fuel pump control circuit -open circuit | Wiring, fuel pump, multifunction control module,ECM |
| P127F | Fuel pump control circuit -circuit malfunction | Wiring, fuel pump, multifunction control module,ECM |
| P1386 | Engine control module (ECM), knock control -defective | Fuel contamination, mechanical fault, ECM |
| P1404 | Exhaust gas recirculation (EGR) valve position sensor malfunction | Wiring, exhaust gas recirculation (EGR) valve, ECM |
| P1411 | Cylinder cut-out solenoid 1 -malfunction | Wiring, cylinder cut-out solenoid, oil pressure, ECM |
| P1414 | Cylinder cut-out solenoid 4 -malfunction | Wiring, cylinder cut-out solenoid, oil pressure, ECM |
| P1416 | Cylinder cut-out solenoid 6 -malfunction | Wiring, cylinder cut-out solenoid, oil pressure, ECM |
| P1417 | Cylinder cut-out solenoid 7 -malfunction | Wiring, cylinder cut-out solenoid, oil pressure, ECM |
| P1501 | Vehicle over-speed condition -rear axle speed greater than front axle | Wiring, VSS, mechanical fault, ECM |
| P1502 | Vehicle over-speed condition -front axle speed greater than rear axle | Wiring, VSS, mechanical fault, ECM |
| P150D | Cold start emission control -irregular idle speed | Wiring, connections, engine coolant temperature (ECT) sensor, manifold absolute pressure (MAP) sensor, H02S circuit fault, mechanical fault, ECM |
| P1513 | Starter request circuit -switch stuck | Starter enable circuit short to positive, ECM |
| P1521 | Engine oil sensor module -malfunction | Wiring, connectors, oil quality, oil level |
| P1572 | Brake pedal position (BPP) switch -circuit malfunction | BPP switch adjustment, wiring, BPP switch |
| P1573 | Brake pedal position (BPP) switch -circuit malfunction | BPP switch adjustment, wiring, BPP switch |
| P1593 | Cruise control system, multi-function input Acircuit stuck | Wiring, poor connection, multi-function switch, mechanical fault, ECM |
| P1600 | CAN data bus, rough road signal -signal error | Trouble code(s) stored in other system(s), wiring, poor connection, immobilizer control module, ABS control module, ECM |
| P1602 | Engine control module (ECM) not programmed | New ECM not programmed, incorrectly programmed, ECM |
| P1603 | Engine control module (ECM) -RAM link error | ECM |
| P1604 | Engine control module (ECM) -RAM read/write error | ECM |
| P1607 | Engine control module (ECM) -shut down timer error | ECM |
| P1612 | Throttle position (TP) control module malfunction | Wiring, connector, throttle position (TP) control module |
| P1618 | Engine control module (ECM) -primary 5 volt output erratic | Wiring, poor connection, oil pressure sensor, APP sensor, CKP sensor, throttle control unit, TPS sensor, ECM |
| P1628 | Engine control module (ECM) -auxiliary 5 volt output erratic | Wiring, poor connection, APP sensor, CMP sensor, EGR solenoid, EGR valve position sensor, MAP sensor, ECM |
| P1652 | CAN data bus -short circuit to ground | Wiring, connected system, ECM |
| P1653 | CAN data bus -short circuit to ground | Wiring, connected system, ECM |
| P1681 | CAN data bus, instrumentation -no signal | Wiring, instrumentation control module |
| P1684 | Engine control module (ECM) -supply voltage | Wiring, battery |
| P1686 | CAN data bus, immobilizer control module no signal | Wiring, immobilizer control module |
| P1687 | CAN data bus, instrumentation -no signal | Wiring, instrumentation control module (mechanical) |
| P1694 | CAN data bus, ECM -no signal | Wiring, ECM |
| P1695 | CAN data bus, body control module (BCM) no signal | Wiring, BCM |
| P1696 | Engine control module (ECM) -EEPROM error | ECM |
| P1697 | Engine control module (ECM) -EEPROM error | ECM |
| P1698 | CAN data bus, transmission -no signal | Wiring, ECM |
| P1775 | Solenoid switch valve locked in TCC (torqueconverter clutch) position | Wiring open circuit/short circuit, transmission system relay, transmission fluid level low, UR pressure switch, solenoid switch valve |
| P1776 | Solenoid switch valve locked in UR (low/reverse)position | Wiring open circuit/short circuit, transmission system relay, transmission fluid level low, UR pressure switch, solenoid switch valve |
| P1790 | Fault immediately after shift | Speed ratio error, transmission mechanical fault |
| P1793 | Torque reduction communication error | Wiring open circuit/short circuit, ECMITCM |
| P1794 | Transmission speed sensor -ground circuit | Wiring open circuit, TCM, input shaft speed (ISS) sensor, output shaft speed (055) sensor |
| P1797 | Manual shift overheat | Wiring, transmission fluid level low, transmission cooling fan -if fitted, transmission fluid temperature (TFT) sensor |
| P1854 | Manifold absolute pressure (MAP) sensor/ turbocharger (TC) boost pressure sensorrange/performance problem | Intake/exhaust leak, wiring, MAP sensor, TC boost pressure sensor, TC boost pressure actuator |
| P1861 | Fuel ,level -variation between tank levels | Wiring, fuel tank, fuel tank siphon hose, fuel gauge tank sensor(s), fuel pump |
| P1897 | Engine control module (ECM) -communication malfunction | ECM |
| P3400 | Cylinder cut-out system, bank 1 -malfunction | Wiring, cylinder cut-out solenoid(s), oil pressure, H02S, ECM |
| P3401 | Cylinder cut-out solenoid 1 -circuit malfunction | Wiring, cylinder cut-out solenoid, ECM |
| P3402 | Cylinder cut-out solenoid 1 -malfunction | Wiring, cylinder cut-out solenoid, oil pressure, ECM |
| P3425 | Cylinder cut-out solenoid 4 -circuit malfunction | Wiring, cylinder cut-out solenoid, ECM |
| P3426 | Cylinder cut-out solenoid 4 -malfunction | Wiring, cylinder cut-out solenoid, oil pressure, ECM |
| P3441 | Cylinder cut-out solenoid 6 -circuit malfunction | Wiring, cylinder cut-out solenoid, ECM |
| P3442 | Cylinder cut-out solenoid 6 -malfunction | Wiring, cylinder cut-out solenoid, oil pressure, ECM |
| P3449 | Cylinder cut-out solenoid 7 -circuit malfunction | Wiring, cylinder cut-out solenoid, ECM |
| P3450 | Cylinder cut-out solenoid 7 -malfunction | Wiring, cylinder cut-out solenoid, oil pressure, ECM |
| P3497 | Cylinder cut-out system, bank 2 malfunction | Wiring, cylinder cut-out solenoid(s), oil pressure, H02S, ECM |
| U110A | Steering column function control module, serialcommunication -circuit malfunction | Wiring, CAN data bus, ECM |
| U110C | Fuel level, serial communication -circuit malfunction | Wiring, instrument panel, CAN data bus, ECM |
| U110E | Outside air temperature, serial communication -circuit malfunction | CAN data bus, multifunction control module front, ECM |
| U110F | Fuel volume, serial communication -circuit malfunction | Wiring, instrument panel, CAN data bus, multifunction control module front, ECM |
| U1110 | Vehicle speed, serial communication -circuit malfunction | CAN data bus, ABS control module, ECM |
| U1120 | Wheel distance traveled, serial communication -circuit malfunction | CAN data bus, ABS control module, ECM |
| U1113 | NC pressure sensor -communication malfunction | Wiring, multifunction control module, ECM |
| U1403 | Fuel level, serial communication -implausiblesignal | Wiring, instrument panel, CAN data bus, multifunction control module front, ECM |
| U1411 | Fuel volume, serial communication -implausiblesignal | Wiring, instrument panel, CAN data bus, multifunction control module front, ECM |
| U1412 | Vehicle speed, serial communication -implausiblesignal | CAN data bus, ABS control module, ECM |
| U1413 | Odometer mileage, serial communication -implausible signal | Wiring, instrument panel, CAN data bus, multifunction control module front, ECM |
| U1417 | LH front wheel, distance. traveled -implausible Signal | ABS trouble code(s) stored, CAN data bus, ABS control module, ECM |
| U1418 | RH front wheel, distance traveled -implausiblesignal | ABS trouble code(s) stored, CAN data bus, ABS control module, ECM |
