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| 12 | No reference pulses to Electronic Control Module (ECM) |
| 13 | Oxygen (O2) Sensor - signal stays low ("lean") during warm engine cruise |
| 14 | Coolant Temperature Sensor (CTS) - signal voltage is low |
| 15 | Coolant Temperature Sensor (CTS) - signal voltage is high |
| 16 | High battery voltage |
| OR Direct Ignition System (DIS) fault - line open or shorted to ground | |
| 17 | RPM signal problem |
| 21 | Throttle Position Sensor (TPS) - signal voltage is high during engine idle or deceleration |
| 22 | Throttle Position Sensor (TPS) - signal voltage is low during engine idle |
| OR Fuel cutoff relay circuit - open or shorted to ground | |
| 23 | Manifold Air Temperature (MAT) Sensor - signal voltage is low |
| OR Throttle Position Sensor (TPS) error | |
| 24 | Vehicle Speed Sensor (VSS) - signal is constant (no pulsing) during engine deceleration |
| 25 | Manifold Air Temperature (MAT) Sensor - signal voltage is low |
| OR Vacuum Switching Valve Circuit open or shorted to ground | |
| OR ATS Sensor - signal voltage is high | |
| 26 | Quad driver module |
| 27 | 2nd gear switch |
| 28 | 3rd gear switch |
| 29 | 4th gear switch |
| 31 | Manifold Absolute Pressure (MAP) Sensor - signal voltage is low |
| OR Fuel injector | |
| OR CAM diagnostic | |
| OR Governor Malfunction | |
| OR Wastegate overboost | |
| OR Wastegate Eletrical Signal - open or shorted to ground | |
| 32 | Barometric Pressure (BARO) Sensor circuit failure |
| OR Exhaust Gas Recirculation (EGR) valve diagnostic switch - closed during engine startup or open when EGR flow requested by ECM | |
| OR EGR / EVRV (Electronic Vacuum Regulator Valve) | |
| 33 | Mass Air Flow (MAF) Sensor - signal voltage or frequency is high during engine idle |
| OR Manifold Absolute Pressure (MAP) Sensor - signal voltage is high during idle [***Note: Engine mis-fire or unstable idle may cause this code] | |
| 34 | Mass Air Flow (MAF) Sensor - signal voltage or frequency is low during engine cruise |
| OR Manifold Absolute Pressure (MAP) Sensor - signal voltage is low during ignition on | |
| 35 | Idle Air Control (IAC) system problem - can not set desired RPM |
| 36 | Mass Air Flow (MAF) Sensor - burn off circuit problem |
| OR Transmission shift problem | |
| OR Direct Ignition System (DIS) fault - extra or missing pulses in Electronic Spark Timing (EST) signal | |
| 38 | Brake switch circuit failure |
| 39 | Torque Converter Clutch (TCC) circuit fault |
| 41 | Cam Sensor (CAM) failure |
| OR Cylinder Select Error | |
| OR Tach Input Error - no reference pulses during engine run | |
| 42 | Electronic Spark Timing (EST) circuit - open or shorted to ground during engine run |
| OR Direct Ignition System (DIS) fault - bypass circuit open or shorted ground during engine run | |
| OR Fuel Cutoff Relay Circuit - open or shorted to ground | |
| 43 | Electronic Spark Timing (EST) Circuit - low voltage detected |
| 44 | Lean exhaust indication - Oxygen (O2) Sensor voltage stays low after on or two minutes of engine run |
| 45 | Rich exhaust indication - Oxygen (O2) Sensor voltage stays high after one minute of engine run |
| 46 | Vehicle Anti-Theft Sytem (VATS) failure |
| OR Power Steering Switch failure | |
| 47 | Electronic Control Module (ECM) computer circuit problems - Universal Asynchronous Receiver / Transmitter (UART) link |
| 48 | Misfire |
| 49 | Vacuum leak |
| 51 | Electronic Control Module (ECM) computer circuit problems - Programmable Read-OnlyMemory (PROM) |
| OR Checksum errors | |
| 52 | Electronic Control Module (ECM) computer circuit problems - fuel calpac missing, analog todigital converter (A/D) error quad driver module (QDM) fault |
| OR Oil Temperature Sensor - signal voltage is low | |
| 53 | Over voltage condition |
| OR Exhaust Gas Recirculation (EGR) | |
| OR Voltage reference error | |
| OR Vehicle Anti-Theft System (VATS) problems |
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| 54 | Low fuel pump voltage |
| OR Fuel pump relay | |
| OR Quad Driver Module (QDM) output failure | |
| 55 | Electronic Control Module (ECM) computer circuit problems - ECM failure, Serial Bus error, SAD error |
| OR Fuel lean malfunction | |
| 56 | Corrosivity / Add Collant |
| OR Port Throttle System Vacuum Sensor problems | |
| 58 | Vehicle Anti-Theft System (VATS) problem |
| 61 | Oxygen (O2) Sensor degraded |
| OR Port Throttle System error | |
| OR Cruise control problems - vent solenoid circuit | |
| 62 | Gear switch imput diagnostics |
| OR Oil Temperature Sensor - signal voltage is high | |
| OR Cruise Control Problems - vacuum solenoid circuit | |
| 63 | Manifold Absolute Pressure (MAP) Sensor - signal voltage is high |
| OR Small EGR failure | |
| OR Right Oxygen (O2) Sensor failure | |
| 64 | Manifold Absolute Pressure (MAP) Sensor - signal voltage is low |
| OR Medium EGR failure | |
| OR Right Oxygen (O2) Sensor - lean condition indicated | |
| 65 | Large EGR failure |
| OR Injector Peak / Hold Diagnostic | |
| OR Right Oxygen (O2) Sensor - rich condition indicated | |
| OR Cruise Control Position Sensor Problem | |
| 66 | Electronic Control Module (ECM) computer circuit problem - internal reset occurred |
| 67 | Cruise Control - switch circuit problems |
| 68 | Cruise Control - system circuit problems |
| 69 | Air Conditioner Pressure Switch - circuit problems |
| 88 | Electronic Control Module (ECM) computer circuit problem - internal reset occured |
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