Diagnostic Trouble Code Descriptions

TROUBLE CODE DESCRIPTION

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

CODE 13 Oxygen sensor circuit open/grounded.

CODE 14A Coolant temperature sensor circuit (high temperature indicated).

CODE 14B Coolant temperature sensor circuit (low temperature indicated).

CODE 21A Throttle position sensor circuit (signal voltage high).

CODE 21B Throttle position sensor circuit (signal voltage low).

CODE 23A Manifold air temperature sensor circuit (low temperature indicated).

CODE 23B Manifold air temperature sensor circuit (high temperature indicated).

CODE 24 Vehicle speed sensor circuit.

CODE 32 EGR system fault.

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

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

CODE 42 Electronic spark timing (EST) circuit.

CODE 44 Oxygen sensor circuit (lean indication).

CODE 45 Oxygen sensor circuit (rich indication).

CODE 51 ECM or EEPROM failure.