| Scan code | Fault location | Probable cause |
| PO, P2, UO | Refer to OBO-II trouble code tables | – |
| P1000 | System readiness test not complete | – |
| P1001 | Self-test | – |
| P1102 | Mass air flow (MAF) sensor -signal malfunction | Wiring, MAF sensor, ECM |
| P1105 | Dual alternator upper -malfunction | Wiring, alternator, ECM |
| P1106 | Dual alternator lower -malfunction | Wiring, alternator, ECM |
| P1107 P1108 | Dual alternator lower -circuit malfunction Alternator warning lamp -circuit malfunction | Wiring, alternator, ECM Wiring, alternator (upper), alternator (lower), ECM |
| P1118 | Intake air temperature (IAT) sensor -low input | Wiring, IAT sensor, ECM |
| P1119 | Intake air temperature (IAT) sensor -high input | Wiring, IAT sensor, ECM |
| P1139 | Water in fuel warning lamp -circuit malfunction | Wiring, bulb open circuit, instrument panel, ECM |
| P1140 | Water in fuel | Wiring, fuel filter, fuel/water separator sensor,ECM |
| P1148 | Alternator 2 -circuit malfunction | Wiring, alternator, ECM |
| P1149 | Alternator 2 -high input | Wiring, alternator, ECM |
| P117A | Engine control module (ECM) -engine oil temperature | Engine overheated, wiring, ECM |
| P1184 | Engine oil temperature (EOT) sensor -out of self-test range | Wiring, EOT sensor, ECM |
| P1209 | Injector control pressure -pressure too high | Oil quality, oil level, oil pressure too high/low, low fuel pressure, fuel pressure regulator control solenoid |
| P1210 | Injector control pressure -pressure too high | Wiring, fuel pressure sensor, ECM |
| P1211 | Injector control pressure -pressure too highllow | Oil quality, oil level, oil pressure too highllow, low fuel pressure, fuel pressure regulator control solenoid |
| P1212 | Fuel pressure sensor -signal too high/low | Oil quality, oil level, oil pressure too highllow, low fuel pressure, fuel pressure sensor, fuel pressure regulator |
| P1218 | Cylinder identification -signal failure | Injector control module, ECM |
| P1219 | Cylinder identification -signal failure | Injector control module, ECM |
| P1227 | Turbocharger (TC) wastegate -pressure high | EGR valve, MAF sensor, TC wastegate actuator, turbocharger |
| P1228 | Turbocharger (TC) wastegate -pressure low | EGR valve, MAF sensor, TC wastegate actuator,turbocharger |
| P1229 | Charge air cooler (CAe) pump -circuit malfunction | Wiring, CAC pump relay, CAC pump |
| P1247 | Turbocharger (TC) boost pressure -pressure low | Wiring, hoses, MAP sensor, ECM |
| P1248 | Turbocharger (TC) boost pressure malfunction | Wiring, hoses, MAP sensor, ECM |
| P1249 | Turbocharger (TC) wastegate -malfunction | Wiring, hoses, TC wastegate regulating valve, TC wastegate actuator, ECM |
| P1250 P1260 | Vehicle immobilizer -malfunction Theft detected -vehicle immobilized | — |
| P1261 | Injector circuit, cylinder 1 -high to low side short | Wiring short circuit |
| P1262 | Injector circuit, cylinder 2 -high to low side short | Wiring short circuit |
| P1263 | Injector circuit, cylinder 3 -high to low side short | Wiring short circuit |
| P1264 | Injector circuit, cylinder 4 -high to low side short | Wiring short circuit |
| P1265 | Injector circuit, cylinder 5 -high to low side short | Wiring short circuit |
| P1266 | Injector circuit, cylinder 6 -high to low side short | Wiring short circuit |
| P1267 | Injector circuit, cylinder 7 -high to low side short | Wiring short circuit |
| P1268 | Injector circuit, cylinder 8 -high to low side short | Wiring short circuit |
| P1271 | Injector circuit, cylinder 1 -high to low side open | Wiring open circuit |
| P1272 P1273 | Injector circuit, cylinder 2 -high to low side openInjector circuit, cylinder 3 -high to low side open | Wiring open circuit Wiring open circuit |
| P1274 | Injector circuit, cylinder 4 -high to low side open | Wiring open circuit |
| P1275 | Injector circuit, cylinder 5 -high to low side open | Wiring open circuit |
| P1276 | Injector circuit, cylinder 6 -high to low side open | Wiring open circuit |
| P1277 | Injector circuit, cylinder 7 -high to low side open | Wiring open circuit |
| P1278 P1280 | Injector circuit, cylinder 8 -high to low side open Fuel pressure sensor -low input | Wiring open circuit Wiring, fuel pressure sensor, ECM |
| P1281 | Fuel pressure sensor -high input | Wiring, fuel pressure sensor, ECM |
| P1282 | Injector control pressure -too high | Wiring, fuel pressure regulator control solenoid |
| P1283 | Fuel pressure regulator control solenoid -circuit malfunction | Wiring open circuit/short circuit to positive |
| P1284 | Self-test not complete -fuel pressure sensorfailure | Wiring, fuel pressure sensor, ECM |
| P1291 | Injector circuit, right cylinder bank -circuit malfunction | High side short circuit to ground/positive, injector(s), injector control module |
| P1292 | Injector circuit, left cylinder bank -circuit malfunction | High side short circuit to ground/positive, injector(s), injector control module |
| P1293 | Injector circuit, right cylinder bank -circuit malfunction | High side open circuit, injector(s), injector control module |
| P1294 | Injector circuit, left cylinder bank -circuit malfunction | High side open circuit, injector(s), injector control module |
| P1295 | Multiple faults, right cylinder bank | Wiring short circuit to ground, injector control module |
| P1296 | Multiple faults, left cylinder bank | Wiring short circuit to ground, injector control module |
| P1297 | Injector circuit -malfunction | Wiring short circuit, injector control module |
| P1298 | Injector control module -internal fault | Injector control module |
| P1316 | Injector control module -trouble code(s) stored | Wiring, injector control module, ECM |
| P1334 | Exhaust gas recirculation (EGR)/throttle position sensor -range/performance problem | Wiring, EGRlthrottle position sensor, ECM |
| P1335 | Exhaust gas recirculation (EGR) valve position sensor range/performance problem | Hose leak/blockage, wiring, EGR valve position sensor, ECM |
| P1378 | Fuel injector control module (FICM) -low input | Fuse, wiring, FICM relay |
| P1379 | Fuel injector control module (FICM) -high input | Wiring, alternator, ECM |
| P1408 | Exhaust gas recirculation (EGR) system -out of self-test range | Wiring, EGR hoses, EGR valve, EGR solenoid, ECM |
| P1460 | Wide open throttle (WOT) relay, AlC -circuit malfunction | Wiring, WOT relay, ECM |
| P1463 | AlC refrigerant pressure sensor -insufficient pressure change | Wiring, AlC system -mechanical fault, AlC refrigerant pressure sensor, AlC compressor clutch |
| P1464 | AlC demand -signal out of self-test range | Wiring, AlC ON -during self-test, WOT relay (AIC cut-out), ECM |
| P1501 0 | Vehicle speed sensor (VSS) -out of self-test range | Wiring, VSS/ABS wheel speed sensors |
| P1501 f) | Vehicle speed sensor (VSS) -out of self-test range | Electro-magnetic interference |
| P1502 | Diagnostic self-test -communication error | Wiring, ECM |
| P1531 | Accelerator pedal moved during self-test | Repeat test |
| P1536 | Parking brake switch -circuit malfunction | Wiring short circuit to ground/positive, wiring open circuit, low brake fluid |
| P1610 | Engine control module (ECM) | Incorrect programming, ECM |
| P1611 | Engine control module (ECM) | Incorrect programming |
| P1615 | Engine control module (ECM) | Incorrect programming |
| P1616 | Engine control module (ECM) -low input | Incorrect programming |
| P1617 | Engine control module (ECM) | Incorrect programming |
| P1618 | Engine control module (ECM) -low input | Incorrect programming |
| P1633 | ‘Keep alive’ power supply -voltage too low | Wiring, ECM |
| P1635 | Tire/axle ratio out of range | Incorrect tire size, incorrect axle ratio, incorrect vehicle 10 configuration |
| P1636 | Engine control module (ECM) -internal fault | ECM |
| P1639 | Engine control module (ECM) -invalid or missing data | Incorrect vehicle 10 configuration, ECM |
| P1662 | Injector control module relay -circuit malfunction | Wiring, fuses, injector control module relay |
| P1663 | Fuel delivery command signal -malfunction | Wiring open circuit/short circuit to ground, injector control module, ECM |
| P1667 | Cylinder identification -circuit malfunction | Wiring open circuit/short circuit to ground, injector control module relay, injector control module,ECM |
| P1668 | Engine control module (ECM)/injector controlmodule -communication error | Wiring open circuit/short circuit to ground, injector control module relay, injector control module,ECM |
| P1670 | Electronic feedback, ECM/injector control module -communication error | Wiring open circuit/short circuit to ground, injector control module relay, injector control module, ECM |
| P1690 | Turbocharger (TC) wastegate regulating valve malfunction | Wiring open circuit/short circuit to ground, turbocharger (TC) wastegate control solenoid,ECM |
| P1702 | Transmission range (TR) sensor -circuit intermittent | Incorrect adjustment, wiring, TR sensor |
| P1703 | Brake pedal position (BPP) switch out of self-testrange | Wiring, BPP switch, ECM |
| P1704 | Transmission range (TR) sensor -malfunction | Incorrect adjustment, wiring, TR sensor |
| P1705 | Transmission range (TR) sensor out of self-test range | Incorrect adjustment, wiring, TR sensor |
| P1711 | Transmission fluid temperature (TFT) sensor out of self-test range | Transmission not at normal operating temperature -repeat test |
| P1713 | Transmission fluid temperature (TFT) sensor low range failure | Wiring, TFT sensor |
| P1714 | Shift solenoid (SS) A -inductive malfunction | Wiring, 55, ECMITCM |
| P1715 | Shift solenoid (SS) B -inductive malfunction | Wiring, 55, ECMITCM |
| P1718 | Transmission fluid temperature (TFT) sensor high range failure | Wiring, TFT sensor |
| P1725 | Insufficient engine speed increase during self-test | Repeat test |
| P1726 | Insufficient engine speed decrease during self-test | Repeat test |
| P1728 | Torque converter clutch (TCC) -slip fault | TCC |
| P1729 | 4x4L switch -malfunction | Wiring, four wheel drive shift control module, ECM |
| P1740 | Torque converter clutch (TeC) solenoid -malfunction | Wiring, TCC solenoid, ECMfTCM |
| P1744 | Torque converter clutch (TCC) malfunction | Wiring, TCC, TCM |
| P1746 | Transmission fluid pressure (TFP) solenoid -circuit malfunction | Wiring, TFP solenoid, TCM, ECM |
| P1747 | Transmission fluid pressure (TFP) solenoid -short circuit | Wiring, TFP solenoid, ECM |
| P1754 | Coast/converter clutch solenoid -circuit malfunction | Wiring, coast clutch solenoid |
| P1760 | Transmission fluid pressure (TFP) solenoid -short circuit | Wiring, TFP solenoid, TCM |
| P1780 | Overdrive selection switch | Wiring, transmission control switch, ECM |
| P1781 | 4x4L switch -out of self-test range | Wiring, four wheel drive shift control module, 4x4L switch, ECM |
| P1783 | Transmission fluid temperature (TFT) sensoroverheating condition | Wiring, TFT sensor, TCM, ECM |
