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


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

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