| Scan code | Fault location | Probable cause |
| PO, P2, UO | Refer to OBD-II trouble code tables | – |
| P1110 | Decreased engine performance -high intake air temperature | Wiring open circuit/short to positive, ground wire defective, IAT sensor, ECT sensor, cooling system, high engine bay temperature, ECM |
| P1115 | Engine coolant temperature (ECT) sensor/intake air temperature (IAT) sensor-signal variation | Wiring, ECT sensor, IAT 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 |
| P1192 | Intake air temperature (IAT) sensor -voltage low | Wiring, IAT sensor, ECM |
| P1193 | Intake air temperature (IAT) sensor -voltage high | Wiring, IAT sensor, ECM |
| P1194 | Heated oxygen sensor (H02S), heater control -circuit malfunction | Wiring, H02S, ECM |
| P1195 | Heated oxygen sensor (H02S) 1, bank 1 slow response | Wiring, heating inoperative, exhaust leak, H02S |
| P1196 | Heated oxygen sensor (H02S) 1, bank 2 slow response | Wiring, heating inoperative, exhaust leak, H02S |
| P1197 | Heated oxygen sensor (H02S) 2, bank 1 slow response | Wiring, heating inoperative, exhaust leak, H02S |
| P1270 | Intake manifold air control -performance | Wiring, intake manifold air control actuator, ECM |
| P1273 | AlC compressor clutch control circuit 2 (PCM) circuit high | Wiring, AlC compressor clutch, PCM |
| P1275 | AlC compressor clutch control circuit 2 (PCM) over-current | Wiring, AlC compressor clutch, poor connection, PCM |
| P1277 | Starter control circuit 2 (PCM) -short circuit to ground | Wiring, starter motor, PCM |
| P127A | Starter control circuit 2 (PCM) over-current | Wiring, poor connection, starter motor, PCM |
| P127C | Fuel pump control circuit 2 (PCM) -short circuit to ground | Wiring, fuel pump, PCM |
| P127D | Fuel pump control circuit 2 (PCM) -short circuit topower | Wiring, fuel pump, PCM |
| P127E | Fuel pump control circuit 2 (PCM) -open circuit | Wiring, fuel pump, PCM |
| P127F | Fuel pump control circuit 2 (PCM) over-current | Wiring, poor connection, fuel pump, PCM |
| P1278 | Starter control circuit 2 (PCM) -short circuit to positive | Wiring, starter motor, PCM |
| P1279 | Starter control circuit 2 (PCM) -open circuit | Wiring, starter motor, PCM |
| P1280 | Fuel pump relay -circuit malfunction | Wiring, fuel pump relay |
| P1281 | Engine temperature -low for long period | Wiring, cooling system, coolant thermostat, ECTsensor |
| P1282 | Fuel pump relay -wiring open/short circuit | Wiring, fuel pump relay |
| P1288 | Intake manifold air control solenoid (short runner) -wiring open/short circuit | Wiring, intake manifold air control solenoid (short runner) |
| P1289 | Intake manifold air control solenoid -wiring open/short circuit | Wiring, intake manifold air control solenoid |
| P1294 | Idle speed control (ISC) system -rpm lower/higher than expected | Wiring, air leak, throttle valve tight/sticking, lAC valve |
| P1295 | Throttle position (TP) sensor -no 5 volt supply | Wiring, TP sensor, ECM |
| P1296 | Manifold absolute pressure (MAP) sensor no 5 volt supply | Wiring, MAP sensor, ECM |
| P1297 | Manifold absolute pressure (MAP) sensor | Wiring, hose connection(s), MAP sensor |
| P1298 | System too lean -at prolonged wide open throttle | Intake/exhaust leak, MAP sensor, fuel pressure/pump, injector(s), H02S |
| P1299 | Manifold absolute pressure (MAP) sensor/throttle position (TP) sensor | Intake leak, hose connection(s), MAP sensor, TP sensor |
| P1388 | Engine control relay -wiring open/short circuit | Wiring, engine control relay |
| P1389 | Engine control relay -wiring open circuit | Wiring, engine control relay |
| P1390 | Crankshaft position (CKP) sensor/camshaft position (CMP) sensor -signal synchronisation | Timing belt loose/jumped position, CKP sensor, CMP sensor |
| P1391 | Crankshaft position (CKP) sensor/camshaft position (CMP) sensor -intermittent signal | Wiring, poor connection, air gap, CKP sensor, CMP sensor |
| P1398 | Engine control module (ECM) -misfire detection limit reached | Wiring, poor connection, CKP sensor |
| P1403 | Exhaust gas recirculation (EGR) valve position sensor no 5 volt supply | Wiring, 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 |
| P1451 | Diesel particulate filter (DPF) -performance | Wiring, exhaust, DPF pressure differential sensor,DPF, hose |
| P1452 | Diesel particulate filter (DPF) pressure differential sensor hose performance | Wiring, exhaust, DPF pressure differential sensor,DPF, hose |
| P1453 | Diesel particulate filter (DPF) pressure differential sensor -hose blocked | Wiring, exhaust, DPF pressure differential sensor,DPF, hose |
| P1454 | Diesel particulate filter (DPF) pressure differential sensor -flow too high | Wiring, exhaust, DPF pressure differential sensor, DPF, hose |
| P1475 | Engine control module (ECM) -auxiliary 5 voltoutput high | Wiring, ECM |
| P1476 | Secondary air injection (AIR) system -insufficientflow detected | AIR pump, AIR valve, AIR hose(s) |
| P1477 | Secondary air injection (AIR) system -excessive flow detected | AIR pump, AIR valve, AIR hose(s), ECM |
| P1478 P1479 | Ambient/battery temperature sensor range/performance problem Transmissioncooling fan relay -circuit malfunction | Wiring, ambient/battery temperature sensor Wiring, transmission fluid level low, transmission cooling fan, transmission cooling fan relay |
| P1480 | Positive crankcase ventilation (PCV) solenoid -wiring open/short circuit | Wiring, PCV solenoid |
| P1481 | Transmission control module (TCM) -misfire detection | Wiring, poor connection, CKP sensor, TCM |
| P1482 | Catalytic converter temperature sensor -low input | Wiring short circuit to ground, catalytic converter temperature sensor, ECM |
| P1483 | Catalytic converter temperature sensor, high input -wiring short circuit to positive | Wiring, catalytic converter temperature sensor, ECM |
| P1484 | Catalytic converter -overheating | Wiring, engine misfire, catalytic converter, catalytic converter temperature sensor |
| P1485 | Secondary air injection (AIR) solenoid -circuit malfunction | Wiring, AIR solenoid, ECM |
| P1486 | Evaporative emission (EVAP) system blockage detected | Hose connection(s), hose blocked/trapped, EVAP canister |
| P1487 | Engine coolant blower motor relay, high speed -wiring open/short circuit | Wiring, engine coolant blower motor relay (high speed) |
| P1488 | Engine control module (ECM) -auxiliary 5 volt output low | Wiring, ECM |
| P1489 | AlC condenser blower motor relay, high speed -wiring open/short circuit | Wiring, engine coolant blower motor relay (high speed) |
| P1490 | Engine coolant blower motor relay, low speed -wiring open/short circuit | Wiring, engine coolant blower motor relay (low speed) |
| P1491 | Engine coolant blower motor relay open/shortcircuit | Wiring, engine coolant blower motor |
| P1492 | Ambient/battery temperature sensor -voltage high | Wiring, ambient/battery temperature sensor |
| P1493 | Ambient/battery temperature sensor -voltage low | Wiring, ambient/battery temperature sensor |
| P1494 | Evaporative emission (EVAP) leak detectionpump -pressure switch | Wiring, hose leak/blockage, EVAP leak detection pump |
| P1495 | Evaporative emission (EVAP) leak detection pump solenoid -wiring open/short circuit | Wiring, hose leak/blockage, EVAP leak detection pump solenoid |
| P1496 | Engine control module (ECM) -5 volt output low | ECM |
| P1498 | Engine coolant blower motor relay, high speed 3 -wiring open/short circuit | Wiring, engine coolant blower motor relay (highspeed 3) |
| P1499 | Engine coolant blower coupling solenoid -wiring open/short circuit | Wiring, engine coolant blower coupling solenoid |
| P1501 | Vehicle over-speed condition -rear axle speedgreater than front axle | Wiring, VSS, mechanical fault, ECM |
| P1502 | Vehicle over-speed condition -front axle speedgreater than rear axle | Wiring, VSS, mechanical fault, ECM |
| P1513 | Starter request circuit -switch stuck | Wiring short to voltage, 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 |
| P1594 | Alternator -voltage high | Wiring, battery, alternator |
| P1595 | Cruise control -wiring open/short circuit | Wiring, hoses, cruise control master switch, cruisecontrol vacuum switching valve |
| P1596 | Cruise control master switch -high voltage | Wiring, cruise control master switch |
| P1597 | Cruise control master switch -low voltage | Wiring, cruise control master switch |
| P1598 | AlC refrigerant pressure sensor -high input | Wiring, AlC refrigerant pressure too high (coolingfault/incorrectly charged), AlC refrigerant pressure sensor |
| P1599 | AlC refrigerant pressure sensor -low input | Wiring, AlC refrigerant pressure too low(incorrectly charged), AlC refrigerant pressure sensor |
| P1602 | Engine control module (ECM) not programmed | New ECM not programmed, incorrectly programmed, ECM |
| P1603 | Engine control module (ECM) -malfunction | Wiring, fuse(s), 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, 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 |
| P1646 | Engine coolant hydraulic blower motor solenoid/circuit high -circuit malfunction | Wiring, fuse, engine coolant hydraulic blower motor solenoid, ECM |
| P1647 | Engine coolant hydraulic blower motor solenoid/circuit low -circuit malfunction | Wiring, fuse, engine coolant hydraulic blower motor solenoid, ECM |
| P1648 | Glow plug control module -malfunction | Wiring, glow plug circuit, ECM |
| P1649 | Glow plug control module/supply circuit circuit malfunction | Wiring, fuse, ECM |
| P1652 | Data bus, engine control module (ECM)/transmission control module (TCM) -no communication | Wiring, CAN data bus, ECMITCM |
| P1680 | Clutch pedal position (CPP) switch -circuit malfunction | Wiring, CPP switch, ECM |
| P1681 | CAN data bus, instrumentation -no signal | Wiring, instrumentation control module |
| P1682 | Alternator -voltage low | Wiring, battery, alternator drive belt, alternator |
| P1683 | Cruise control | Wiring, cruise control vacuum switching valve |
| P1684 | Engine control module (ECM) -supply voltage disconnected within last 50 ignition switch ON-OFF cycles | Wiring, battery |
| P1685 | Key not programmed into immobilizer control module | Wiring, ignition key not matched/damaged, immobilizer control module |
| P1685 f) | Immobilizer system | Immobilizer control module, ECM |
| 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) |
| P1692 | Fault detected in engine control module (ECM) | Companion trouble code detected in ECM |
| P1693 | Fault detected in companion engine control module (ECM) | Companion trouble code detected in ECM |
| P1694 | CAN data bus, ECM -no signal | Wiring, ECM |
| P1695 | CAN data bus, BCM -no signal | Wiring, SCM |
| P1696 | Engine control module (ECM) -EEPROM error | ECM |
| P1697 | Engine control module (ECM) -EEPROM error | ECM |
| P1698 | CAN data bus, TCM -no signal | Wiring, TCM |
| P1699 | CAN data bus, AlC control module -no signal | Wiring, AlC control module |
| P1715 | Restricted port in T3 range | Other trouble code(s) stored, transmission fluid level, transmission shift linkage adjustment D |
| P1719 | Skip shift solenoid -wiring open/short circuit | Wiring, skip shift solenoid |
| P1736 | Transmission -gear/input speed/output speed ratioerror | Transmission fluid level, wiring, input shaft speed (ISS) sensor, output shaft speed (055) sensor, transmission mechanical fault |
| P1740 | Torque converter clutch (Tee)/overdrive solenoid -performance problem | TCC, overdrive solenoid, transmission mechanical fault |
| P1756 | Governor pressure not equal to target (15-20 PSI)-mid pressure malfunction | Signal wire open/short circuit, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM -no 5 volt supply |
| P1757 | Govemor pressure not equal to target (15-20 PSI) -zero pressure malfunction | Signal wire open/short circuit, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM -no 5 volt supply |
| P1762 | Govemor pressure sensor -incorrect signal | Signal wire short circuit to ground/positive, supply wire open/short circuit, transmission fluid level, governor pressure solenoid, governor pressure sensor, ECM |
| P1763 | Govemor pressure sensor -signal high | Signal wire short circuit to positive, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM |
| P1764 | Governor pressure sensor -signal low | Signal wire short circuit to ground, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM |
| P1765 | Transmission system relay -wiring open/short circuit | Wiring, transmission system relay, ECM |
| P1775 | Solenoid switch valve locked in Tee (torqueconverter clutch) position -wiring open/short circuit | Wiring, 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/short circuit | Wiring, 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/short circuit | Wiring, 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 |
| P1830 | Clutch pedal position (CPP) switch override relay-circuit malfunction | Wiring, CPP switch override relay, ECM |
| P1861 | Transfer tube disconnected | Wiring open circuit/short to ground, damaged fuel tank, fuel level sender |
| P1897 | Engine speed calculation error | ECM |
| P1899 | Park/neutral position (PNP) switch -input circuit malfunction | Wiring, PNP switch, ECM |
| U110A | Controller area network (CAN) data bus -communication malfunction | Wiring, steering column control module, multifunction control module, ECM |
| U110C | Controller area network (CAN) data bus -communication malfunction | Wiring, fuel level sensor, multifunction control module, ECM |
| U110E | Outside air temperature sensor communication malfunction | Wiring, outside air temperature sensor, multifunction control module, ECM |
| U1110 | Wheel speed sensor -communication malfunction | Wiring, speed sensor, anti-lock brake system(ABS) control module, ECM |
| U1111 | Controller area network (CAN) data bus -communication malfunction | Wiring, multifunction control module, ECM |
| U1113 | AlC pressure sensor -communication malfunction | Wiring, multifunction control module, ECM |
| U1120 | Wheel speed sensor -communication malfunction | Wiring, speed sensor, anti-lock brake system (ABS) control module, ECM |
| U1403 | Control area network (CAN) data bus -fuel level -signal implausible | Wiring, instrument panel, multifunction control module, ECM |
| U1411 | Controller area network (CAN) data bus/fuel level-communication malfunction | Wiring, instrumentation control module, multifunction control module, ECM |
| U1412 | Wheel speed sensor -CAN data communication malfunction | Wiring, wheel speed sensor, ABS control module, ECM |
| U1413 | Controller area network (CAN) data bus/ instrument panel -signal implausible | Wiring, instrumentation control module, multifunction control module, ECM |
| U1417 | Wheel speed sensor, left -CAN data communication malfunction | Wiring, wheel speed sensor, ABS control module, ECM |
| U1418 | Wheel speed sensor, right -CAN data communication malfunction | Wiring, wheel speed sensor, ABS control module, ECM |
