Trouble Code Identification

NOTE: Trouble codes retrieved from PCM may be either engine or transmission related. Only engine-related codes are covered in this article. For transmission-related codes, see the AUTO TRANS DIAGNOSIS - 4L60-E & 4L80-E article in this section. See DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION table to determine if code is engine or transmission related.

The DEC system codes indicate failure of a specific sensor and/or circuit. Sensor/circuit diagnosis may indicate replacement of PCM. DTC 51 indicates PROM is either improperly installed or has failed.
If PCM is replaced at any point during diagnostic testing and if condition is still not corrected after replacing PCM, the following may be the cause:
- An incorrect PCM or PROM application may cause a malfunction, which may or may not set a code.
- The PCM connector may be the problem. Connector terminals may have to be removed from connector to be checked properly.
- PROM failure. Although the PROM rarely fails, it could be the cause of the problem.
- Replacement PCM may be faulty.
- Intermittent problem. Make a careful physical inspection of affected sensor/circuit.
- A shorted solenoid, coil relay, or harness may be the cause of PCM failure. Use Short Circuit Tester (J-34636) to check for short circuits.

DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

Code

Probable Cause

13 ⁽¹⁾

Engine Shutoff Solenoid Circuit Fault

14 ⁽¹⁾

ECT Sensor Circuit Low (High Temp. Indicated)

15 ⁽¹⁾

ECT Sensor Circuit High (Low Temp. Indicated)

16 ⁽¹⁾

Vehicle Speed Sensor Buffer Fault

17 ⁽¹⁾

High Resolution Circuit Fault

18 ⁽¹⁾

Pump Cam Reference Pulse Error

19 ⁽¹⁾

Crankshaft Position Reference Error

21 ⁽¹⁾

Accelerator Pedal Position No. 1 Circuit High

22 ⁽¹⁾

Accelerator Pedal Position No. 1 Circuit Low

23 ⁽¹⁾

Accelerator Pedal Position No. 1 Circuit Range Fault

24 ⁽²⁾

Vehicle Speed Sensor Transmission Output Signal

25 ⁽¹⁾

Accelerator Pedal Position No. 2 Circuit High

26 ⁽¹⁾

Accelerator Pedal Position No. 2 Circuit Low

27 ⁽¹⁾

Accelerator Pedal Position No. 2 Circuit Range Fault

28 ⁽²⁾

Trans. Range Pressure Switch

29 ⁽¹⁾

Glow Plug Relay Circuit Fault

31 ⁽¹⁾

EGR Control Pressure/BARO Sensor Circuit Low (High Vacuum)

32 ⁽¹⁾

EGR Circuit Error

33 ⁽¹⁾

EGR Control Pressure/BARO Sensor Circuit High (Low Vacuum)

34 ⁽¹⁾

Injection Timing Stepper Motor Circuit Fault

35 ⁽¹⁾

Injection Pulse Width Error (Response Time Short)

36 ⁽¹⁾

Injection Pulse Width Error (Response Time Long)

37/38 ⁽²⁾

TCC Brake Switch On/Off

39 ⁽²⁾

TCC Stuck Off

41 ⁽¹⁾

Brake Switch Circuit Fault

42 ⁽¹⁾

Fuel Temperature Circuit Low (High Temp. Indicated)

43 ⁽¹⁾

Fuel Temperature Circuit High (Low Temp. Indicated)

44 ⁽¹⁾

EGR Pulse Width Error

45 ⁽¹⁾

EGR Vent Error

46 ⁽¹⁾

MIL (SERVICE ENGINE SOON) Circuit Fault

47 ⁽¹⁾

IAT Sensor Circuit Low (High Temp. Indicated)

48 ⁽¹⁾

IAT Sensor Circuit High (Low Temp. Indicated)

49 ⁽¹⁾

SERVICE THROTTLE SOON Light Circuit Fault

51 ⁽¹⁾

PROM Error (Faulty Or Incorrect PROM)

52/53 ⁽²⁾

System Voltage High

54 ⁽¹⁾

PCM Fuel Circuit Error

56 ⁽¹⁾

Injection Pump Calibration Resistor Error

57 ⁽¹⁾

PCM 5-Volt Shorted

58 ⁽²⁾

Transmission Fluid Temperature High

59 ⁽²⁾

Transmission Fluid Temperature Low

61 ⁽¹⁾

Turbo Boost Sensor Circuit High

62 ⁽¹⁾

Turbo Boost Sensor Circuit Low

63 ⁽¹⁾

Accelerator Pedal Position No. 3 Circuit High

64 ⁽¹⁾

Accelerator Pedal Position No. 3 Circuit Low

65 ⁽¹⁾

Accelerator Pedal Position No. 3 Circuit Range Fault

66 ⁽²⁾

3-2 Control Solenoid Circuit Fault

67 ⁽²⁾

TCC Solenoid Circuit Check

68 ⁽²⁾

Overdrive Ratio Error

69 ⁽²⁾

Torque Converter Clutch Stuck On

71 ⁽¹⁾

Set/Coast Switch Fault

72 ⁽²⁾

VSS Circuit Loss Transmission Output Signal

73 ⁽²⁾

Pressure Control Solenoid (Current Error)

74 ⁽²⁾

Trans. Input Speed Error

75 ⁽²⁾

System Voltage Low

76 ⁽¹⁾

Resume/Accel Switch Fault

78 ⁽¹⁾

Wastegate Solenoid Fault

79 ⁽²⁾

Transmission Fluid Temperature High

81 ⁽²⁾

Transmission 2-3 Error

82 ⁽²⁾

Transmission 1-2 Error

83 ⁽²⁾

TCC Solenoid Circuit Fault

84 ⁽¹⁾

Accelerator Pedal Position Circuit Fault

85 ⁽²⁾

Undefined Gear Ratio

86 ⁽²⁾

Low Gear Ratio Error

87 ⁽²⁾

High Gear Ratio Error

88 ⁽¹⁾

TDC Offset Error

91 ⁽¹⁾

Cylinder Balance Fault No. 1 Cylinder

92 ⁽¹⁾

Cylinder Balance Fault No. 2 Cylinder

93 ⁽¹⁾

Cylinder Balance Fault No. 3 Cylinder

94 ⁽¹⁾

Cylinder Balance Fault No. 4 Cylinder

95 ⁽¹⁾

Cylinder Balance Fault No. 5 Cylinder

96 ⁽¹⁾

Cylinder Balance Fault No. 6 Cylinder

97 ⁽¹⁾

Cylinder Balance Fault No. 7 Cylinder

98 ⁽¹⁾

Cylinder Balance Fault No. 8 Cylinder

99 ⁽¹⁾

Accelerator Pedal Position No. 2 (5-Volt Reference Fault)

⁽¹⁾	Code is engine related. Engine related codes are covered in this article.

⁽²⁾	Code is transmission related. Transmission related codes are covered in AUTO TRANS DIAGNOSIS - 4L60-E & 4L80-E article in this section.