| CODE | MEANING |
| 12 | No engine RPM reference pulses--System Normal |
| 13 | Oxygen Sensor (02S) circuit open--left side on 2 sensor system |
| 14 | Engine Coolant Temperature (ECT) sensor-- possible circuit high or shorted circuit |
| 15 | Engine Coolant Temperature (ECT) sensor-- possible circuit low or open circuit |
| 16 | Direct Ignition System (DIS), fault line circuit |
| -or- Distributor ignition system (low resolution pulse) |
| -or- Missing 2X reference circuit |
| -or- OPTI-Spark ignition timing system (low resolution pulse) |
| -or- System voltage out of range |
| 17 | Camshaft Position Sensor (CPS) or spark reference circuit error |
| 18 | Crank/Cam error |
| 19 | Camshaft Position Sensor (CPS) circuit |
| 21 | Throttle Position (TP) sensor circuit--signal out of range, probably high |
| 22 | Throttle Position (TP) sensor circuit--signal voltage low |
| 23 | Intake Air Temperature (IAT or MAT) sensor circuit--temperature out of range, low |
| -or- Open or grounded M/C solenoid--Feedback carburetor system |
| 24 | Vehicle Speed Sensor (VSS) circuit |
| 25 | Intake Air Temperature (IAT or MAT) sensor circuit--temperature out of range, high |
| 26 | Quad-Driver Module (QDM) #1 circuit |
| -or- Transaxle gear switch circuit |
| 27 | Quad-Driver Module (QDM) circuit |
| -or- Transaxle gear switch, probably 2nd gear switch circuit |
| 28 | Quad-Driver Module (QDM) #2 circuit |
| -or- Transaxle gear switch, probably 3rd gear switch circuit |
| 29 | Transaxle gear switch, probably 4th gear switch circuit |
| 31 | Camshaft sensor circuit fault |
| -or- Park/Neutral Position (PNP) switch circuit |
| -or- Wastegate circuit signal |
| 32 | Exhaust Gas recirculation (EGR) circuit fault |
| -or- Barometric Pressure Sensor circuit low--Feedback Carburetor system |
| 33 | Manifold Absolute Pressure (MAP) sensor--signal out of range, high |
| -or- Mass Air Flow (MAF) sensor--signal voltage out of range, probably high |
| 34 | Manifold Absolute Pressure (MAP) sensor--signal out of range, low |
| -or- Mass Air Flow (MAF) sensor circuit (gm/sec low) |
| 35 | Idle Air Control (IAC) or idle speed error |
| -or- Idle speed Control (ISC) circuit--throttle switch shorted--Feedback Carburetor system |
| 36 | Ignition system circuit error |
| -or- Transaxle shift problem--4T60E Transaxle |
| 38 | Brake input circuit fault--torque converter clutch signal |
| 39 | Clutch input circuit fault--Torque converter clutch signal |
| 41 | Cam sensor or cylinder select circuit fault--ignition control (IC) reference pulse system fault |
| -or- Electronic Spark Timing (EST) circuit open or shorted |
| 42 | Electronic Spark Timing (EST) circuit grounded |
| -or- Ignition Control circuit grounded or faulty bypass line |
| 43 | Knock Sensor (KS) or Electronic Spark Control (ESC) circuit fault |
| 44 | Oxygen Sensor (O2S), left side on 2 sensor system--lean exhaust indicated |
| 45 | Oxygen Sensor (O2S), left side on 2 sensor system--rich exhaust indicated |
| 46 | Personal Automotive Security System (PASS-KEY II) circuit |
| -or- Power Steering Pressure Switch (PSPS) circuit |
| 47 | PCM-BCM data circuit |
| 48 | Misfire diagnosis |
| 51 | Calibration error, faulty MEM-CAL, ECM or EEPROM failure |
| 52 | Engine oil temperature sensor circuit, low temperature indicated |
| -or- Fuel Calpac missing |
| -or- Over voltage condition |
| -or- EGR Circuit fault |
| 53 | Battery voltage error |
| -or- EGR problem |
| -or- Personal Automotive Security System (PASS-KEY II) circuit |
| 54 | EGR #2 problem |
| -or- Fuel pump circuit (low voltage) |
| -or- Shorted mixture control solenoid circuit--Feedback Carburetor system |
| 55 | A/D Converter error |
| -or- PCM error or not grounded |
| -or- EGR #3 problem |
| -or- Fuel lean monitor |
| -or- Grounded voltage reference, faulty oxygen sensor, full lean-- Feedback Carburetor system |
| 56 | Quad-Driver Module (QDM) #2 circuit |
| -or- Secondary air inlet valve actuator vacuum sensor circuit signal high--(5.7L VIN J) |
| 57 | Boost control problem |
| 58 | Vehicle Anti-theft System fuel enable circuit |
| 61 | A/C system performance |
| -or- Cruise vent solenoid circuit fault |
| -or- Oxygen Sensor (O2S)--degraded signal |
| -or- Secondary port throttle valve system fault--(5.7L VIN J) |
| -or- Transaxle gear switch signal |
| 62 | Cruise vacuum solenoid circuit fault |
| -or- Engine oil temperature sensor, high temperature indicated |
| -or- Transaxle gear switch signal circuit fault |
| 63 | Oxygen Sensor (O2S), right side--circuit open |
| -or- Cruise system problem (speed error) |
| -or- Manifold Absolute Pressure (MAP sensor--circuit out of range |
| 64 | Oxygen Sensor (O2S), right side--lean exhaust indicated |
| 65 | Oxygen Sensor (O2S), right side--rich exhaust indicated |
| -or- Cruise servo position circuit |
| -or- Fuel injector circuit low current |
| 66 | A/C pressure sensor circuit fault, probably low pressure |
| -or- Engine power switch, voltage high or low or PCM fault (5.7L VIN J) |
| 67 | A/C pressure sensor circuit, sensor or A/C clutch circuit failure |
| -or- Cruise switch circuit fault |
| 68 | A/C compressor relay (shorted circuit) |
| -or- Cruise system fault |
| 69 | A/C clutch circuit or head pressure high |
| 70 | A/C refrigerant pressure sensor circuit (high pressure) |
| 71 | A/C evaporator temperature sensor circuit (low temperature) |
| 72 | Gear selector switch circuit |
| 73 | A/C evaporator temperature sensor circuit (high temperature) |
| 75 | Digital EGR #1 solenoid error |
| 76 | Digital EGR #2 solenoid error |
| 77 | Digital EGR #3 solenoid error |
| 79 | Vehicle Speed Sensor (VSS) circuit signal high |
| 80 | Vehicle Speed Sensor (VSS) circuit signal low |
| 81 | Brake input circuit fault--Torque converter clutch signal |
| 82 | Ignition Control (IC) 3X signal error |
| 85 | PROM error |
| 86 | Analog/Digital ECM error |
| 87 | EEPROM error |
| 99 | Power management |