| Scan code Hex type | Fault location | Probable cause |
| 0 | DTC error | – |
| 1 | Camshaft position (CMP) sensor no signal | Wiring, CMP sensor |
| 2 | Engine control module (ECM) -internal fault | ECM |
| 5 | Alternator -voltage low | Wiring, battery, alternator drive belt, alternator |
| 6 | Alternator -voltage high | Wiring, battery, alternator |
| OA | Engine control relay | Wiring open circuit/short circuit, engine control relay |
| 8 | Alternator, field control -circuit malfunction | Wiring open circuit/short circuit, alternator, battery |
| OC | Torque converter clutch (TCe) solenoid -electrical | Wiring open circuit/short circuit, TCC solenoid |
| OE | Engine coolant blower motor relay -low/highspeed | Wiring open circuit/short circuit, engine coolant blower motor relay -low/high speed |
| OF | Cruise control | Wiring open circuit/short circuit, hoses, voltage low/high, cruise control master switch, cruisecontrol vacuum switching valve |
| 10 | A/C compressor clutch relay | Wiring open circuit!short circuit, A/C compressor clutch relay |
| 11 | Exhaust gas recirculation (EGR) -circuit malfunction | Wiring, EGR solenoid, ECM |
| 12 | Evaporative emission (EVAP) canister purge valve -circuit malfunction | Wiring open circuit/short circuit, EVAP canister purge valve |
| 13 | Injector 3 -circuit malfunction | Wiring, injector |
| 14 | Injector 2 -circuit malfunction | Wiring, injector |
| 15 | Injector 1 -circuit malfunction | Wiring, injector |
| 19 | Idle speed control (ISC) system -malfunction | Wiring open circuit/short circuit, lAC valve |
| 1A | Throttle position (TP) sensor -low input | Wiring short circuit to ground, TP sensor |
| 18 | Throttle position (TP) sensor -high input | Wiring short circuit to positive, TP sensor |
| 1E | Engine coolant temperature (ECT) sensor low input | Coolant thermostat, wiring short circuit to ground, ECT sensor |
| 1F | Engine coolant temperature (ECT) sensor highinput | Coolant thermostat, wiring open circuit! short circuit to positive, ground wire defective, ECT sensor |
| 21 | Engine temperature -low for long period | Wiring, cooling system, coolant thermostat, ECT sensor |
| 24 | Manifold absolute pressure (MAP) sensor low input | Wiring short circuit to ground, MAP sensor |
| 25 | Manifold absolute pressure (MAP) sensor high input | Wiring short circuit to positive, MAP sensor |
| 27 | Manifold absolute pressure (MAP) sensor | Wiring, hose connection(s), MAP sensor |
| 28 | Crankshaft position (CKP) sensor no signal | Wiring, air gap, CKP sensor |
| 29 | Ignition coil C, primary -circuit malfunction | Wiring, ignition coil, ECM |
| 2A | Ignition coil B, primary -circuit malfunction | Wiring, ignition coil, ECM |
| 28 | Ignition coil A, primary -circuit malfunction | Wiring, ignition coil, ECM |
| 2C | Engine control relay | Wiring open circuit, engine control relay |
| 31 | Engine control module (ECM) EEPROM error | ECM |
| 32 | Shift solenoid (SS) 3-4 -electrical | Wiring, shift solenoid, ECM |
| 37 | Injector 9 -circuit malfunction | Wiring, injector |
| 38 | Injector 10 circuit malfunction | Wiring, injector |
| 39 | Intake air temperature (IAT) sensor -low input | Wiring short circuit to ground, IAT sensor |
| 3A | Intake air temperature (IAT) sensor -high input | Wiring open circuit/short circuit to positive, ground wire defective, IAT sensor |
| 3D | Injector 4 -circuit malfunction | Wiring, injector |
| 3E | Heated oxygen sensor (H02S) 1, bank 1 high voltage | Wiring short circuit to positive, fuel pressure, injector control, EVAP canister purge valve, air filter blocked, H02S |
| 41 | Heated oxygen sensor (H02S) 1, bank 2 no activity detected | Wiring open circuit, heating inoperative, H02S |
| 42 | Heated oxygen sensor (H02S) 1, bank 2 high voltage | Wiring short circuit to positive, fuel pressure, injector control, EVAP canister purge valve, air filter blocked, H02S |
| 44 | Engine control module (ECM) -intemal fault | ECM |
| 45 | Injector 5 -circuit malfunction | Wiring, injector |
| 46 | Injector 6 -circuit malfunction | Wiring, injector |
| 4A | Transmission fluid temperature (TFT) sensor low input | Wiring short circuit to ground, TFT sensor, ECM |
| 48 | Transmission fluid temperature (TFT) sensor high input | Wiring short circuit to positive, TFT sensor, ECM |
| 4C | Ignition coil D, primary -circuit malfunction | Wiring, ignition coil, ECM |
| 40 | Ignition coil E, primary -circuit malfunction | Wiring, ignition coil, ECM |
| 4F | Injector 7 -circuit malfunction | Wiring, injector |
| 50 | Injector 8 -circuit malfunction | Wiring, injector |
| 52 | Cruise control | Wiring, cruise control vacuum switching valve |
| 56 | Cruise control master switch -high voltage | Wiring, cruise control master switch |
| 57 | Cruise control master switch -low voltage | Wiring, cruise control master switch |
| 65 | Fuel pump relay | Wiring open circuit/short circuit, fuel pump relay |
| 66 | Heated oxygen sensor (H02S) 1, bank 1 slow response | Heating inoperative, wiring, H02S |
| 67 | Heated oxygen sensor (H02S) 1, bank 1 heater control -circuit malfunction | Wiring, H02S |
| 68 | Heated oxygen sensor (H02S) 2, bank 1 slow response | Heating inoperative, wiring, exhaust leak, H02S |
| 69 | Heated oxygen sensor (H02S) 2, bank 1, heater control -circuit malfunction | Wiring, H02S |
| 6A | Random/multiple cylinder(s) -misfire detected | Wiring, spark plug(s), HT lead(s), injector(s), ignition coil(s), low compression |
| 68 | Cylinder 1 -misfire detected | Wiring, engine mechanical fault, ignition/fuel system, injector |
| 6C | Cylinder 2 -misfire detected | Wiring, engine mechanical fault, ignition/fuel system, injector |
| 60 | Cylinder 3 -misfire detected | Wiring, engine mechanical fault, ignition/fuel system, injector |
| 6E | Cylinder 4 -misfire detected | Wiring, engine mechanical fault, ignition/fuel system, injector |
| 70 | Catalytic converter system, bank 1 -efficiency below threshold | Catalytic converter, wiring, H02S 2 |
| 71 | Evaporative emission (EVAP) system incorrect flow detected | Hose connection(s), intake leak, EVAP canister purge valve |
| 72 | Park/neutral position (PNP) switch -input circuit malfunction | Wiring, PNP switch, ECM |
| 73 | Power steering pressure (PSP) switch -range/performance problem | Wiring, PS system, PSP switch |
| 76 | System too rich, bank 1 | Wiring, intake blocked, EVAP canister purge valve, fuel pressure, EGR system, injector(s), air filter blocked, ignition system, H02S |
| 77 | System too lean, bank 1 | Wiring, intake/exhaust leak, MAP sensor, fuel pressure/pump, EVAP canister purge valve,injector(s), H02S |
| 78 | System too rich, bank 2 | Wiring, intake blocked, EVAP canister purge valve, fuel pressure, EGR system, injector(s), air filter blocked, ignition system, H02S |
| 79 | System too lean, bank 2 | Wiring, intake/exhaust leak, MAP sensor, fuel pressure/pump, EVAP canister purge valve,injector(s), H02S |
| 7A | Heated oxygen sensor (H02S) 1, bank 2 slow response | Heating inoperative, wiring, H02S |
| 78 | Heated oxygen sensor (H02S) 2, bank 2 slow response | Heating inoperative, wiring, exhaust leak, H02S |
| 7C | Heated oxygen sensor (H02S) 1, bank 2, heater control -circuit malfunction | Wiring, H02S, ECM |
| 70 | Heated oxygen sensor (H02S) 2, bank 2, heater control -circuit malfunction | Wiring, H02S, ECM |
| 7E | Heated oxygen sensor (H02S) 2, bank 1 high voltage | Wiring short circuit to positive, catalytic converter,H02S, ECM |
| 7F | Heated oxygen sensor (H02S) 2, bank 2 high voltage | Wiring short circuit to positive, catalytic converter,H02S, ECM |
| 80 | Insufficient coolant temperature for closed loop fuel control | Wiring, cooling system, coolant thermostat,ECTsensor |
| 84 | Throttle position (TP) sensor -range/ performance problem | Wiring, accelerator cable adjustment, TP sensor |
| 87 | Manifold absolute pressure (MAP) sensor no 5 volt supply | Wiring, MAP sensor, ECM |
| 8A | Idle speed control (ISC) system -rpm lower/higher than expected | Wiring, air leak, throttle valve tight/sticking, lAC valve |
| 80 | Governor pressure not equal to target (15-20 PSI) -mid pressure malfunction | Signal wire open circuit/short circuit, valve body,sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM -no 5 volt supply |
| BE | Governor pressure not equal to target (15-20 PSI) -zero pressure malfunction | Signal wire open circuit/short circuit, valve body, sensor supply wire open circuit, transmission fluid level, governor pressure solenoid, transmission mechanical fault, ECM -no 5 volt supply |
| 94 | Torque converter clutch (TCC) solenoid -circuit malfunction | Wiring, TCC solenoid |
| 95 | Fuel level sensor -low input | Wiring open circuit, fuel level sensor |
| 96 | Fuel level sensor -high input | Wiring short circuit to positive, fuel level sensor |
| 97 | Fuel level sensor -malfunction | Wiring, fuel level sensor |
| 99 | Ambient/battery temperature sensor -voltage low | Wiring, ambient/battery temperature sensor |
| 9A | Ambient/battery temperature sensor -voltage high | Wiring, ambient/battery temperature sensor |
| 9B | Heated oxygen sensor (H02S) 1, bank 1 -lowvoltage | Exhaust leak, wiring short circuit to ground, H02S |
| 9C | Heated oxygen sensor (H02S) 2, bank 1 -low voltage | Exhaust leak, wiring short circuit to ground, H02S |
| 90 | Crankshaft position (CKP) sensor/camshaft position (CMP) sensor -intermittent signal | Wiring, poor connection, air gap, CKP sensor, CMP sensor |
| AO | Evaporative emission (EVAP) system -small leak detected | Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve |
| A1 | Evaporative emission (EVAP) system -large leak detected | Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve |
| A4 | Transmission fluid temperature (TFT) sensorrange/performance problem | Wiring, TFT sensor |
| A5 | Gear selection, 3-4 -shift malfunction | Wiring, TR sensor, shift solenoids, transmission mechanical fault |
| A6 | Output shaft speed (OSS) sensor -circuitmalfunction | Wiring, OSS sensor, ECM |
| A7 | Governor pressure sensor -signal low | Signal wire short circuit to ground, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM |
| AB | Governor pressure sensor -signal high | Signal wire short circuit to positive, supply wire open circuit, transmission fluid level, governor pressure sensor, ECM |
| A9 | Governor pressure sensor -incorrect signal | Signal wire short circuit to ground/positive, supply wire open circuit/short circuit, transmission fluid level, governor pressure solenoid, governor pressure sensor, ECM |
| AB | Transmission fluid pressure (TFP) solenoidelectrical | Wiring, TFP solenoid, ECM |
| AO | Transmission system relay | Wiring open circuit/short circuit, transmission system relay, ECM |
| AE | Cylinder 5 -misfire detected | Wiring, engine mechanical fault, ignition/fuel system, injector |
| AF | Cylinder 6 -misfire detected | Wiring, engine mechanical fault, ignition/fuel system, injector |
| BO | Cylinder 7 -misfire detected | Wiring, engine mechanical fault, ignition/fuel system, injector |
| B1 | Cylinder 8 -misfire detected | Wiring, engine mechanical fault, ignition/fuel system, injector |
| B2 | Cylinder 9 -misfire detected | Wiring, engine mechanical fault, ignition/fuel system, injector |
| B3 | Cylinder 10 misfire detected | Wiring, engine mechanical fault, ignition/fuel system, injector |
| B4 | Catalytic converter system, bank 2 -efficiency below threshold | Catalytic converter, wiring, H02S 2 |
| B5 | Heated oxygen sensor (H02S) 1, bank 2 -lowvoltage | Exhaust leak, wiring short to ground, H02S, ECM |
| B6 | Heated oxygen sensor (H02S) 2, bank 2 -lowvoltage | Exhaust leak, wiring short to ground, H02S, ECM |
| B7 | Evaporative emission (EVAP) leak detection pump solenoid | Wiring open circuit/short circuit, hose leak! blockage, EVAP leak detection pump solenoid |
| B8 | Evaporative emission (EVAP) leak detectionpump -pressure switch | Wiring, hose leak!blockage, EVAP leak detection pump |
| BA | Engine control module (ECM) -misfire detection limit reached | Wiring, poor connection, CKP sensor |
| BB | Evaporative emission (EVAP) system -blockage detected | Hose connection(s), hose blocked/trapped, EVAP canister |
| BC | Overdrive solenoid/switch -performance problem | Wiring, overdrive solenoid/switch, transmission mechanical fault, ECM |
| BD | Heated oxygen sensor (H02S) 3, bank 1, heatercontrol -circuit malfunction | Wiring, H02S, ECM |
| CO | Heated oxygen sensor (H02S) 1, bank 1 slow response | Heating inoperative, wiring, H02S |
| C1 | Heated oxygen sensor (H02S) 1, bank 2 slowresponse | Wiring, heating inoperative, exhaust leak, H02S |
| C2 | Heated oxygen sensor (H02S) 2, bank 1 slowresponse | Wiring, heating inoperative, exhaust leak, H02S |
| DE | CAN data bus, engine control module (ECM) nosignal | Wiring, ECM |
| OF | Engine control module (ECM) | Companion module trouble code detected in ECM |
