ECM/PCM Code Description

The MIL (Service Engine Soon) will be "ON" if an emission malfunction exists. If the malfunction clears, the lamp will go "OFF" and the DTC will be stored in the PCM. Any DTCs stored will be cleared if no problem recurs within 50 engine starts.
All DTCs with the asterisk * are transmission related. Remember, always start with the lowest numerical engine DTC first. When diagnosing some engine DTCs, other transmission symptoms can occur.

DTC 12
Malfunction Indicator Lamp (MIL) Circuit.

DTC 13
Oxygen Sensor (O2S) Circuit (Open Circuit).
Heated Oxygen Sensor (HO2S) Circuit (Open Circuit).

DTC 14
Engine Coolant Temperature (ECT) Sensor Circuit (Signal Voltage Low, High Temperature Indicated).

DTC 15
Engine Coolant Temperature (ECT) Sensor Circuit (Signal Voltage High, Low Temperature Indicated).

DTC 16
Vehicle Speed Sensor (VSS) Buffer Fault (4L60E Transmission Only).

DTC 21
Throttle Position (TP) Sensor Circuit (Signal Voltage High).

DTC 22
Throttle Position (TP) Sensor Circuit (Signal Voltage Low).

DTC 24
* Vehicle Speed Sensor (VSS) Circuit.

DTC 28
* Fluid Pressure Switch Assembly Fault.

DTC 31
Engine Speed Control Governor System.

DTC 32
Exhaust Gas Recirculation (EGR) Circuit.

DTC 33
Manifold Absolute Pressure (MAP) Sensor Circuit (Signal Voltage High - Low Vacuum).

DTC 34
Manifold Absolute Pressure (MAP) Sensor Circuit (Signal Voltage Low - High Vacuum).

DTC 35
Idle Air Control (IAC) System.

DTC 36
Idle Speed Control Actuator Fault.

DTC 37
* Brake Switch Stuck "ON".

DTC 38
* Brake Switch Stuck "OFF".

DTC 39
* Torque Converter Clutch (TCC) Stuck "OFF"

DTC 42
Ignition Control (IC) Circuit (Shorted or Grounded Circuit).

DTC 43
Knock Sensor (KS) Circuit.

DTC 44
Oxygen Sensor (O2S) Circuit (Lean Exhaust Indicated).

DTC 45
Oxygen Sensor (O2S) Circuit (Rich Exhaust Indicated).

DTC 51
Programmable Read Only Memory (PROM) Error (Faulty or Incorrect Calibration).

DTC 52
* System Voltage High Long.

DTC 53
* System Over Voltage.

DTC 54
Fuel Pump Relay Circuit.

DTC 55
Faulty Electronic Control Module (ECM).

DTC 58
* Transmission Fluid Temperature (TFT) Sensor Circuit Low (High Temperature Indicated).

DTC 59
* Transmission Fluid Temperature (TFT) Sensor Circuit High (Low Temperature Indicated).

DTC 66
* 3-2 Control Solenoid Circuit Fault.

DTC 67
* Torque Converter Clutch (TCC) Solenoid Circuit Fault.

DTC 68
* Transmission Component Slipping.

DTC 69
* Torque Converter Clutch (TCC) Stuck "ON"

DTC 72
* Vehicle Speed Sensor (VSS) Loss.

DTC 73
* Pressure Control Solenoid

DTC 74
* Transmission Input Speed (TIS) Sensor Circuit.

DTC 75
* System Voltage Low.

DTC 79
* Transmission Fluid Overtemperature.

DTC 81
* Transmission 2-3 Shift Solenoid Circuit Fault.

DTC 82
* Transmission 1-2 Shift Solenoid Circuit Fault.

DTC 83
* Torque Converter Clutch (TCC) Pulse Width Modulated (PWM) Solenoid Circuit Fault.

DTC 85
* Undefined Ratio Error.

DTC 86
* Low Ratio Error.

DTC 87
* High Ratio Error.