| Scan code | Fault location | Probable cause |
| PO,P2,UO | Refer to OBO·II trouble code tables | – |
| P113C | Oxygen sensor (02S), control module | Wiring, connections, 025 control module |
| supply voltage circuit malfunction | |
| P125A | Power enable control circuit -voltage low | Wiring, ECM |
| P125B | Power enable control circuit -voltage high | Wiring, ECM |
| P1272 | A/C compressor clutch, circuit 2 -voltage low | Wiring, A/C compressor clutch, ECM |
| P1273 | A/C compressor clutch, circuit 2 -voltage high | Wiring, A/C compressor clutch, ECM |
| P1274 | A/C compressor clutch, circuit 2 -open circuit | Wiring, A/C compressor clutch, ECM |
| P1275 | A/C compressor clutch, circuit 2 –circuit malfunction | Wiring, A/C compressor clutch, ECM |
| P1277 | Starter control circuit 2 voltage low | Wiring, starter, powertrain control module (PCM) |
| P1278 | Starter control circuit 2 -voltage high | Wiring, starter, powertrain control module (PCM) |
| P1279 | Starter control circuit 2 -open | Wiring, starter, powertrain control module (PCM) |
| P127A | Starter control circuit 2 -high resistance | Wiring, starter, powertrain control module (PCM) |
| 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 |
| P141A | Exhaust gas temperature (EGT) sensor 1 & 2 -interchanged | Wiring, connectors swapped, diesel particulate filter (OPF) |
| P144E | , Exhaust gas recirculation (EGR) -circuit voltage low | Wiring, EGR valve, ECM |
| P144F | Exhaust gas recirculation (EGR) -circuit voltagehigh | Wiring, EGR valve, ECM |
| P1451 | Diesel particulate filter (DPF) full | EGT low, mechanical fault, exhaust leak |
| P1484 | Diesel particulate filter (DPF) temperature toohigh | Fuel, injector, EGT sensor, mechanical fault |
| P1506 | Crankcase pressure sensor range/performance | Crankcase pressure sensor |
| P1507 | Crankcase pressure sensor range/performance | Crankcase breather filter |
| P1508 | Crankcase pressure sensor range/performance | Crankcase breather filter, mechanical fault |
| P1652 | CAN data bus -short circuit to ground | Wiring, connected system, ECM |
| P1740 | Torque converter clutch (TCC)/overdrive solenoid -performance problem | Other trouble code(s) stored, TCC, overdrive solenoid, transmission mechanical fault |
| P1756 | Governor pressure not equal to target (35-40 PSI) | Wiring, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure sensor, governor pressure solenoid, transmission mechanical fault, TCM |
| P1757 | Governor pressure not equal to target (above 3 PSI at 0 mph) -pressure malfunction | Wiring, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure sensor, governor pressure solenoid, transmission oil contaminated, transmission mechanical fault,TCM |
| P1762 | Governor pressure sensor -incorrect signal | Wiring, supply wire open circuit/short circuit, governor pressure solenoid, governor pressure sensor, transmission fluid level, transmission mechanical fault, TCM |
| P1763 | Governor pressure sensor -signal high | Signal wire short circuit to positive, supply wire open circuit, transmission fluid level, governor pressure sensor, TCM |
| P1764 | Govemor pressure sensor -signal low | Signal wire short circuit to ground, supply wire open circuit, transmission fluid level, governor pressure sensor, TCM |
| P1765 | Transmission system relay | Wiring open circuit/short circuit, transmission system relay, TCM |
| U1403 | Fuel level, serial communication -implausiblesignal | Wiring, instrument panel, CAN data bus,multifunction control module front, ECM |
| U1412 | Vehicle speed, serial communication -implausible signal | CAN data bus, ABS control module, ECM |
| U1421 | Fuel volume, serial communication implausible signal | Wiring, instrument panel, CAN data bus, multifunction control module front, ECM |
