| Scan code | Fault location | Probable cause |
| PO, P2,UO | Refer to OBD-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 |
| P1105 | Turbocharger (TC) boost pressure actuator circuit malfunction | Wiring, TC boost pressure actuator |
| P1115 | Engine coolant temperature (ECT) sensor/intake air temperature (IAT) sensor/outside air temperature sensor -signal variation | Wiring, ECT sensor, IAT sensor, outside air temperature sensor, ECM |
| P1128 | Heated oxygen sensor (H02S) 1, bank 1 signal error | Mechanical fault, wiring, fuel pressure, injector(s), intake leak, H02S, ECM |
| P1129 | Heated oxygen sensor (H02S) 1, bank 2 signal error | Mechanical fault, wiring, fuel pressure, injector(s), intake leak, H02S, ECM |
| P1239 | Engine oil temperature (EOT) -temperature too low | Engine oil, wiring, EOT sensor, ECM |
| P126B | Engine control module, output driver -short to ground | Wiring, injector(s), ignition coil(s), ECM, multifunction control module |
| P126C | Engine control module, output driver -short to positive | Wiring, injector(s), ignition coil(s), ECM, multifunction control module |
| P1260 | Engine control module, output driver -open circuit | Wiring, injector(s), ignition coil(s), ECM,multifunction control module |
| P126E | Engine control module, output driver excessive current draw | Wiring, injector(s), ignition coil(s), ECM, multifunction control module |
| P1272 | Ale compressor clutch, circuit 2 -voltage low | Wiring, AlC compressor clutch, ECM |
| P1273 | Ale compressor clutch, circuit 2 -voltage high | Wiring, AlC compressor clutch, ECM |
| P1274 | AlC compressor clutch, circuit 2 -open circuit | Wiring, AlC compressor clutch, ECM |
| P1275 | AlC compressor clutch, circuit 2 -circuit malfunction | Wiring, AlC compressor clutch, 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, circuit 2 -voltage low | Wiring, fuel pump, ECM |
| P127D | Fuel pump, circuit 2 -voltage high | Wiring, fuel pump, ECM |
| P127E | Fuel pump, circuit 2 -open circuit | Wiring, fuel pump, ECM |
| P129C | Powertrain control module (PCM), inverter control -circuit 2 high | Wiring, inverter module, PCM |
| P129E | Powertrain control module (PCM), inverter control-circuit 2 over-current | Wiring, inverter module, PCM |
| 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 |
| 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 AlB -circuit stuck | Wiring, poor connection, multi-function switch, mechanical fault, 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/writeerror | ECM |
| P1607 | Engine control module (ECM) -shut down timer error | ECM |
| P1618 | Engine control module (ECM) -primary 5 volt output erratic | Wiring, poor connection, AlC 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, AlC pressure sensor,APP sensor, CMP sensor, EGR solenoid, EGR valve position sensor, MAP sensor, transmission fluid pressure sensor, ECM |
| P1652 | CAN data bus -short circuit to ground | Wiring, connected system, ECM |
| P1684 | Engine control module (ECM) -supply voltage disconnected within last 50 ignition switch ON-OFFcycles | Wiring, battery |
| P1687 | CAN data bus, instrumentation -no signal | Wiring, instrumentation control module (mechanical) |
| P1694 | CAN data bus, engine control module (ECM) no signal | Wiring, ECM |
| P1695 | CAN data bus, SCM -no signal | Wiring, BCM |
| P1696 | Engine control module (ECM) -EEPROM error | ECM |
| P1697 | Engine control module (ECM) -EEPROM error | ECM |
| P1715 | Restricted port in T3 range | Other trouble code(s) stored, transmission fluid level, transmission shift linkage adjustment 0 |
| P1736 | Transmission -gear/input speed/output speed ratio error | Transmission fluid level, wiring, input shaft speed (ISS) sensor, output shaft speed (055) sensor,transmission mechanical fault |
| P1775 | Solenoid switch valve locked in TCC (torque converter 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 |
| 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, multifunction control module front, ECM |
| U110E | Outside air temperature, serial communication -circuit malfunction | CAN data bus, multifunction control module front,ECM |
| U110F | Fuel volume, serial communication -circuitmalfunction | Wiring, instrument panel, CAN data bus, multifunction control module front, ECM |
| U1110 | Vehicle speed, serial communication -circuit malfunction | CAN data bus, ASS control module, ECM |
| U1111 | Odometer mileage, serial communication -circuitmalfunction | Wiring, instrument panel, CAN data bus, multifunction control module front, ECM |
| U1113 | NC pressure sensor -communication malfunction | Wiring, multifunction control module, ECM |
| U1120 | Wheel distance traveled, serial communication -circuit malfunction | CAN data bus, ASS control module, ECM |
| U1403 | Fuel level, serial communication -implausible signal | Wiring, instrument panel, CAN data bus, multifunction control module front, ECM |
| U1411 | Fuel volume, serial communication implausible signal | Wiring, instrument panel, CAN data bus, multifunction control module front, ECM |
| U1412 | Vehicle speed, serial communication -implausible signal | CAN data bus, ASS 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 implausible signal | ABS trouble code(s) stored, CAN data bus, ASS control module, ECM |
