Diagnostic Trouble Code List

Trouble Code Descriptions

12 Self-diagnostics are functioning - not a trouble code

13 Oxygen sensor circuit open

14 Coolant temperature sensor circuit, high temperature indicated (low circuit resistance indicates grounded circuit to ECM or shorted sensor)

15 Coolant temperature sensor circuit, low temperature indicated (high circuit resistance indicates open circuit to ECM or open sensor)

21 Throttle position sensor circuit (signal voltage high)

22 Throttle position sensor circuit (signal voltage low)

24 Vehicle speed sensor circuit

32 EGR system failure

33 MAP sensor circuit (signal voltage high, low vacuum)

34 MAP sensor circuit (signal voltage low, high vacuum)

42 Electronic spark timing (EST) circuit

43 Electronic spark control (ESC) circuit

44 Oxygen sensor circuit (lean indication)

45 Oxygen sensor circuit (rich indication)

51 PROM error (faulty or incorrectly installed PROM or incorrect PROM for application)

52 CALPAK error (faulty or incorrect CALPAK

54 Fuel pump circuit (low voltage)

55 ECM error