| 12 (1) | No Engine Speed Sensor Reference Pulse |
| 13 (1) | Open Oxygen Sensor Circuit |
| 13 (2) | Engine Shutoff Solenoid Circuit Fault |
| 14 (1) | CTS Voltage Low (Sensor Or Signal Line Grounded) |
| 14 (2) | ECT Sensor Circuit Low (High Temp. Indicated) |
| 15 (1) | CTS Voltage High (Sensor Or Signal Line Open) |
| 15 (2) | ECT Sensor Circuit High (Low Temp. Indicated) |
| 16 (1) | VSS Buffer Fault (4.3L) |
| 16 (3) | Transmission Output Speed Signal Low |
| 16 (2) | Vehicle Speed Sensor Buffer Fault |
| 17 (2) | High Resolution Circuit Fault |
| 18 (2) | Pump Cam Reference Pulse Error |
| 19 (2) | Crankshaft Position Reference Error |
| 21 (1) | TP Sensor Voltage High (Open Ckt Or Misadjusted TP Sensor) |
| 21 (2) | Accelerator Pedal Position No. 1 Circuit High |
| 22 (1) | TP Sensor Voltage Low (Circuit Grounded) |
| 22 (2) | Accelerator Pedal Position No. 1 Circuit Low |
| 23 (1) | Intake Air Temperature Low |
| 23 (2) | Accelerator Pedal Position No. 1 Circuit Range Fault |
| 24 (4) | Vehicle Speed Sensor Transmission Output Signal |
| 25 (1) | Intake Air Temperature Sensor Voltage Low |
| 25 (2) | Accelerator Pedal Position No. 2 Circuit High |
| 26 (2) | Accelerator Pedal Position No. 2 Circuit Low |
| 27 (2) | Accelerator Pedal Position No. 2 Circuit Range Fault |
| 28 (5) | Trans. Range Pressure Switch (4L60E/4L80E) |
| 29 (2) | Glow Plug Relay Circuit Fault |
| 31 (2) | EGR Control Pressure/BARO Sensor Circuit Low (High Vacuum) |
| 32 (1) (2) | EGR Circuit Error |
| 33 (1) | MAP Voltage High (Circuit Open Or Short To Voltage) |
| 33 (2) | EGR Control Pressure/BARO Sensor Circuit High (Low Vacuum) |
| 34 (1) | MAP Voltage Low (Circuit Open Or Short To Ground) |
| 34 (2) | Injection Timing Stepper Motor Circuit Fault |
| 35 (1) | IAC System Fault |
| 35 (2) | Injection Pulse Width Error (Response Time Short) |
| 36 (2) | Injection Pulse Width Error (Response Time Long) |
| 37/38 (5) | TCC Brake Switch On/Off (4L60E/4L80E) |
| 39 (5) | TCC Stuck Off (4L80E) |
| 41 (2) | Brake Switch Circuit Fault |
| 42 (1) | EST Circuit Fault |
| 42 (2) | Fuel Temperature Circuit Low (High Temp. Indicated) |
| 43 (1) | Knock Sensor Circuit Fault |
| 43 (2) | Fuel Temperature Circuit High (Low Temp. Indicated) |
| 44 (1) | Lean Exhaust Indicated |
| 44 (2) | EGR Pulse Width Error |
| 45 (1) | Rich Exhaust Indicated |
| 45 (2) | EGR Vent Error |
| 46 (2) | MIL (SERVICE ENGINE SOON) Circuit Fault |
| 47 (2) | IAT Sensor Circuit Low (High Temp. Indicated) |
| 48 (2) | IAT Sensor Circuit High (Low Temp. Indicated) |
| 49 (2) | SERVICE THROTTLE SOON Light Circuit Fault |
| 51 (1) (2) | PROM Error (Faulty Or Incorrect PROM) |
| 52 (1) | PROM/CALPAC Error (Faulty/Incorrect PROM/CALPAC) |
| 52 (5) | System Voltage High (4L60E/4L80E) |
| 53 (4) | System Voltage High |
| 54 (1) | Fuel Pump Circuit Voltage Low |
| 54 (2) | PCM Fuel Circuit Error |
| 55 (1) | ECM/PCM/VCM Error |
| 56 (2) | Injection Pump Calibration Resistor Error |
| 57 (2) | PCM 5-Volt Shorted |
| 58 (5) | Trans. Fluid Temp. High (4L60E/4L80E) |
| 59 (5) | Trans. Fluid Temp. Low (4L60E/4L80E) |
| 61 (2) | Turbo Boost Sensor Circuit High |
| 62 (2) | Turbo Boost Sensor Circuit Low |
| 63 (2) | Accelerator Pedal Position No. 3 Circuit High |
| 64 (2) | Accelerator Pedal Position No. 3 Circuit Low |
| 63/64 (5) | BARO Signal High/Low (4L80E) |
| 65 (2) | Accelerator Pedal Position No. 3 Circuit Range Fault |
| 66 (5) | 3-2 Control Solenoid Circuit Fault (4L60E) |
| 67 (5) | TCC Solenoid Circuit Check (4L60E) |
| 68 (5) | Overdrive Ratio Error (4L80E) |
| 69 (5) | Torque Converter Clutch Stuck On (4L60E/4L80E) |
| 71 (2) | Set/Coast Switch Fault |
| 71 (5) | Camshaft Sensor Circuit Low (4L80E) |
| 72 (5) | VSS Circuit Loss (4L60E/4L80E) Transmission Output Signal |
| 73 (5) | Pressure Control Solenoid (4L60E/4L80E) (Current Error) |
| 74 (5) | Trans. Input Speed Error (4L80E) |
| 75 (5) | System Voltage Low (4L60E/4L80E) |
| 76 (2) | Resume/Accel Switch Fault |
| 78 (2) | Wastegate Solenoid Fault |
| 79 (5) | Trans. Fluid Temp. High (4L60E/4L80E) |
| 81 (5) | Trans. 2-3 Error (4L60E/4L80E) |
| 82 (5) | Trans. 1-2 Error (4L60E/4L80E) |
| 83 (5) | TCC Solenoid Circuit Fault (4L80E) |
| 84 (2) | Accelerator Pedal Position Circuit Fault |
| 85 (5) | Undefined Gear Ratio (4L80E) |
| 86 (5) | Low Gear Ratio Error (4L80E) |
| 87 (5) | High Gear Ratio Error (4L80E) |
| 88 (2) | TDC Offset Error |
| 91 (2) | Cylinder Balance Fault No. 1 Cylinder |
| 92 (2) | Cylinder Balance Fault No. 2 Cylinder |
| 93 (2) | Cylinder Balance Fault No. 3 Cylinder |
| 94 (2) | Cylinder Balance Fault No. 4 Cylinder |
| 95 (2) | Cylinder Balance Fault No. 5 Cylinder |
| 96 (2) | Cylinder Balance Fault No. 6 Cylinder |
| 97 (2) | Cylinder Balance Fault No. 7 Cylinder |
| 98 (2) | Cylinder Balance Fault No. 8 Cylinder |
| 99 (2) | Accelerator Pedal Position No. 2 (5-Volt Reference Fault) |
| P0107 (1) | MAP Signal Voltage Low (4.3L) |
| P0108 (1) | MAP Signal Voltage High (4.3L) |
| P0122 (1) | TP Sensor Circuit Signal Voltage Low |
| P0123 (1) | TP Sensor Circuit Signal Voltage High |
| P0131 (1) | HO2S Circuit Low Signal Voltage |
| P0132 (1) | HO2S Circuit High Signal Voltage |
| P0139 (1) | HO2S Circuit Open (4.3L) |
| P0171 (1) | Fuel Trim Lean (Lean Exhaust) |
| P0172 (1) | Fuel Trim Rich (Rich Exhaust) |
| P0320 (1) | Ignition Control Error (4.3L) |
| P0321 (1) | Spark Reference Circuit |
| P0327 (1) | Knock Sensor Circuit Grounded (4.3L) |
| P0328 (1) | Knock Sensor Circuit Open (4.3L) |
| P0342 (1) | Cam Signal Circuit |
| P0400 (1) | EGR Error |
| P0500 (1) | VSS Error (4.3L) |
| P1530 (1) | A/C Head Pressure Switch Circuit |
| P1531 (1) | Low A/C Refrigerant Charge |
| P1558 (1) | Cruise System Problem |
| P1561 (1) | Cruise Vent Solenoid Circuit |
| P1562 (1) | Cruise Vacuum Solenoid Circuit |
| P1565 (1) | Cruise Servo Position Sensor Circuit |
| P1567 (1) | Cruise Switches Circuit |
| P1568 (1) | Cruise System Problem |
| P1571 (5) | Traction Control Desired Torque Out Of Range |
| P1573 (5) | Traction Control Loss Of ABS/TCS Serial Data |
| P1599 (1) | Cruise Power Management |
| P1623 (1) | PROM Error |
| P1632 (1) | System Voltage High (4.3L) |
| (1) Gasoline engine code covered in TESTS W/CODES - 4.3L for 4.3L V6 models, TESTS W/CODES - 5.0L for 5.0L V8-equipped models, TESTS W/CODES - 5.7L for models equipped with a 5.7L V8 and for 7.4L V8, see: TESTS W/CODES - 7.4L . (2) Diesel engine code. For diesel code diagnosis, see TESTS W/CODES - 6.5L DIESEL article in this section. (3) Models equipped with 4L60E transmission. (4) Common gasoline engine and transmission code covered in appropriate G - GASOLINE TESTS W/ CODES article in the ENGINE PERFORMANCE section. See footnote number 1 above. (5) Transmission code covered in this article. |
