GM OBD/OBD2 Codes >> GM 92-93 6.2L VIN C

GM

Various Models
Trouble CodeFault LocationProbable Cause
12Start of diagnosisNo engine speed (RPM) signal received
14Engine coolant temperature (ECT) sensor -voltage lowWiring, ECT sensor, ECM
15Engine coolant temperature (ECT) sensor -voltage high Wiring open circuit, ECT sensor, ECM
16Transmission output speed sensor -signal low Wiring, transmission output speed sensor, ECM
21Fuel lever position sensor -voltage high Wiring open circuit/short circuit to positive, fuel lever position sensor, ECM
22Fuel lever position sensor -voltage low Wiring open circuit/short circuit to ground, fuel lever position sensor, ECM
23Fuel lever position sensor -signal out of range Adjustment, wiring, fuel lever position sensor
24Vehicle speed sensor (VSS) -no signalWiring, VSS, ECM
31Manifold absolute pressure (MAP) sensor -voltage lowWiring open circuit/short circuit to ground, MAP sensor, ECM
32Exhaust gas recirculation (EGR) solenoidWiring, poor connections, EGR valve, ECM
33Manifold absolute pressure (MAP) sensor -voltage highWiring, hose blocked/leaking, MAP sensor, ECM
51Engine control module (ECM), PROM -malfunctionPoor connections, incorrect programming, ECM
52Engine control module (ECM) -malfunctionECM
53 (1992)Engine control module (ECM), sensor supply voltage -circuit malfunctionWiring, poor connections, MAP sensor
53 (1993)System voltage -highAlternator
55Engine control module (ECM) -malfunctionECM
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