Diagnostic Trouble Code List

DTC 12 Self-diagnostics are functioning - not a trouble code

DTC 13 Oxygen sensor circuit open

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

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

DTC 21 Throttle position sensor circuit (signal voltage high)

DTC 22 Throttle position sensor circuit (signal voltage low)

DTC 24 Vehicle speed sensor circuit

DTC 32 EGR system failure

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

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

DTC 42 Ignition Control (IC) circuit

DTC 43 Knock Sensor (KS) circuit

DTC 44 Oxygen sensor circuit (lean indication)

DTC 45 Oxygen sensor circuit (rich indication)

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

DTC 52 CALPAK error (faulty or incorrect CALPAK

DTC 54 Fuel pump circuit (low voltage)

DTC 55 ECM error