| Scan code | Fault location | Probable cause |
| PO, P2,UO | Refer to OBD-11 trouble code tables | – |
| P1101 | Intake airflow – incorrect | Wiring, mechanical fault, engine coolant temperature (ECT) sensor, barometric pressure (BARO) sensor, intake air temperature (IAT) sensor, manifold absolute pressure (MAP) sensor, mass air flow (MAF) sensor,throttle position (TP) switch |
| P1133 | Heated oxygen sensor (H02S) 1, bank 1 – insufficient switching | Wiring, exhaust system leaking, H02S |
| P1134 | Heated oxygen sensor (H02S) 1, bank 1 – slow response | Wiring, oxygen sensor heater, exhaust system leaking, H025 |
| P1137 | Heated oxygen sensor (H02S) 2, bank 1 – voltage low | Wiring, exhaust system leaking, H02S |
| P1138 | Heated oxygen sensor (H02S) 2, bank 1 – voltage high | Wiring, H025 |
| P1153 | Heated oxygen sensor (H02S) 1, bank 2 – insufficient switching | Wiring, oxygen sensor heater, exhaust system leaking, H02S |
| P1154 | Heated oxygen sensor (H02S) 1, bank 2 – slow response | Wiring, oxygen sensor heater, exhaust system leaking, H025 |
| P1171 | Fuel system – lean during acceleration | Fuel filter, fuel pump, H025, injectors |
| P1174 | Fuel trim, bank 1 -adapted value out of range | Air induction system, vacuum leak, exhaust leak/blockage, fuel system, ignition system, injectors, mechanical fault |
| P1175 | Fuel trim, bank 2 -adapted value out of range | Air induction system, vacuum leak, exhaust leak/blockage, fuel system, ignition system, injectors, mechanical fault |
| P1258 | Engine coolant – overheating | Engine coolant level low, engine coolant thermostat, engine cooling fans, radiator ventilation obstructed, water pump, mechanical fault |
| P1380 | Antilock brake system (ABS)/traction control system (TCS), rough road signal to ECM – malfunction | ABS trouble code(s) stored |
| P1380 0 | Misfire detected – rough road signal error | ABS trouble code(s) stored, if no faults are recorded – erase trouble code and re-test |
| P1381 | Antilock brake system (ABS)/traction control system (TCS), rough road signal to ECM – no communication | Wiring, poor connections, ABS |
| P1381 0 | Misfire detected – no communication, ABS
control module | ABS trouble code(s) stored, if no faults are recorded – erase trouble code and re-test |
| P1400 | Cold start emission control – malfunction | Intake/exhaust leak/blockage, mechanical fault, idle speed control (ISC) system, ignition control, engine coolant temperature (ECT) sensor, H025 |
| P1516 | Throttle command/actual throttle position – signal variation | Wiring, throttle valve sticking, throttle control module |
| P1574 | Stop lamp switch – signal error | Wiring, connections, stop lamp switch |
| P1600 | Engine control module (ECM) – malfunction | Engine control module (ECM) |
| P1621 | Engine control module (ECM) – memory performance | ECM |
| P1627 | Engine control module (ECM) – malfunction | Engine control module (ECM) |
| P1633 | Engine control module (ECM), ignition supply voltage | Fuse, wiring, ECM |
| P1634 | Engine control module (ECM) – ignition supply voltage – voltage low | Wiring, ECM |
| P1637 | Alternator ‘L’ terminal – circuit malfunction | Wiring, voltage regulator, alternator, battery temperature sensor, ECM |
| P1681 | Engine control module (ECM) – malfunction | Engine control module (ECM) |
| P1682 | Engine control module (ECM) – ignition power supply less than 10 V | Wiring, ECM |
| P1683 | Engine control module (ECM) – malfunction | Engine control module (ECM) |
| P1810 | Transmission fluid pressure (TFP) switch – manual valve position | Fluid level low, wiring, selector lever linkage incorrectly adjusted, ECMfTCM |
| P1860 | Torque converter clutch (TCC) solenoid, pulse width modulation (PWM) – circuit malfunction | Wiring open circuit/short circuit to ground, TCC solenoid, ECM |
