GM OBD/OBD2 Codes >> GM 92-94 5.7L VIN K

GM

92-94 5.7L VIN K
Flash CodeFault LocationProbable Cause
12Start of diagnosisNo engine speed (RPM) signal received
13Oxygen sensor (O2S)/heated oxygen sensor (HO2S)Wiring open circuit, O2S/HO2S, ECM
14Engine coolant temperature (ECT) sensor – high temperature indicatedWiring short circuit to ground, ECT sensor, ECM
15Engine coolant temperature (ECT) sensor – low temperature indicatedWiring open circuit, ECT sensor, ECM
16 Vehicle speed sensor (VSS) buffer – signal lowWiring, VSS buffer, ECM
17 Camshaft position (CMP) sensor – circuit malfunctionWiring, CMP sensor, mechanical fault, ECM
21Throttle position (TP) sensor – voltage highWiring open circuit/short circuit to positive, TP sensor, ECM
22Throttle position (TP) sensor – voltage lowWiring open circuit/short circuit to ground, TP sensor, ECM
23Intake air temperature (IAT) sensor – low temperatureWiring open circuit, IAT sensor, ECM
24Vehicle speed sensor (VSS)Wiring open circuit/short circuit to ground, PROM, VSS, ECM
25Intake air temperature (IAT) sensor – high temperatureWiring short circuit to ground, IAT sensor, ECM
28               Transmission range (TR) switchWiring open circuit/short circuit to ground/short circuit to positive, TR switch, ECM
31 Engine speed control system – malfunctionWiring, throttle valve motor, throttle valve control module, ECM
32Exhaust gas recirculation (EGR) solenoidWiring open circuit/short circuit to ground, EGR valve, ECM
33Manifold absolute pressure (MAP) sensor – circuit malfunctionWiring open circuit/short circuit to positive, hose blocked/leaking, MAP sensor, ECM
34Manifold absolute pressure (MAP) sensor – circuit malfunctionWiring open circuit/short circuit to ground, MAP sensor, ECM
35 Idle air control (IAC) valveWiring, IAC valve, intake system leaking, fuel system, PCV valve, A/C system, mechanical fault, ECM
36Auxiliary idle air control valveWiring, idle air control valve, vacuum pipes, ECM
37Brake pedal position (BPP) switch for torque converter clutch (TCC)Wiring open circuit/short circuit to ground, incorrectly adjusted BPP switch, BPP switch, ECM
38Brake pedal position (BPP) switch/ torque converter clutch (TCC)Wiring open circuit/short circuit to ground, supply wire, BPP switch, TCC switch, ECM
39 Brake pedal position (BPP) switch – stuck OFFWiring, BPP switch, ECM
42Ignition control module (ICM) – electronic spark timing (EST)/ignition control (IC)/bypass circuit malfunctionWiring open circuit/short circuit to ground, ICM, ECM
43Knock sensor (KS)Wiring open circuit/short circuit to ground/short to positive, KS, PROM, ECM
44Oxygen sensor (O2S)/heated oxygen sensor (HO2S) – mixture leanWiring short circuit to ground, fuel pressure low, MAP sensor, misfire, fuel contamination, exhaust system leaking, O2S/HO2S, ECM
45Oxygen sensor (O2S)/heated oxygen sensor (HO2S) – mixture richFuel pressure high, injector(s) leaking, O2S contamination, EVAP canister purge valve, TP sensor, MAP sensor, EGR system, O2S/H2OS, ECM
46 Immobilizer system, code – malfunctionIncorrect key, ECM
51Engine control module (ECM) – PROMInsecure PROM, incorrect PROM, ECM
52 Engine control module (ECM) – malfunctionECM
53 System Voltage – highAlternator
54Fuel pump circuit – voltage lowWiring open circuit/short circuit to ground, fuel pump relay, fuel pump, engine oil pressure warning lamp switch, ECM
55 Engine control module (ECM)Ground wiring open circuit, insecure PROM, ECM
58 Transmission fluid temperature (TFT) sensor – voltage lowWiring short circuit to ground, TFT sensor, ECM
59Transmission fluid temperature (TFT) sensor -voltage highWiring open circuit, TFT sensor, ECM
61 Oxygen sensor (O2S)O2S
62 Transmission gear switch signal circuitWiring open circuit/short circuit to ground, 2nd gear switch, 3rd gear switch, ECM
66A/C refrigerant pressure sensor – circuit malfunctionWiring open circuit/short circuit to ground/short circuit to positive, A/C refrigerant pressure sensor, ECM
68 Torque converter clutch (TCC) – slippingWiring, TCC solenoid, transmission mechanical fault, ECM
69 Torque converter clutch (TCC) solenoid – stuck ONWiring open circuit/short circuit to ground, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM
70A/C refrigerant pressure sensor – voltage highWiring open circuit/short circuit to positive, A/C refrigerant pressure sensor, ECM
72Vehicle Speed Sensor (VSS)Wiring open circuit/short circuit to ground, VSS, ECM
73 Transmission fluid pressure (TFP) control solenoid – circuit malfunctionWiring, poor connection, TFP solenoid
74 Transmission input shaft speed sensor – circuit malfunctionWiring, input shaft speed sensor, ECM
75Exhaust gas recirculation (EGR) valve solenoid 1Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
76Exhaust gas recirculation (EGR) valve solenoid 2Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
77Exhaust gas recirculation (EGR) valve solenoid 3Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
79Transmission fluid temperature (TFT) – highTransmission mechanical fault, towing
80Torque converter clutch (TCC) – slippingWiring open circuit/short circuit to ground, supply wire, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM
81 Transmission shift solenoid (SS), 2nd-3rd – circuit malfunctionWiring, SS, ECM
83 Torque converter clutch (TCC) solenoid, pulse width modulated – circuit malfunctionWiring, TCC solenoid, ECUM
90Torque converter clutch (TCC) – stuck ONWiring open circuit/short circuit to ground, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM
96Engine control module (ECM) – ignition supply voltage lowWiring open circuit, alternator, ECM
98Engine control module (ECM) – incorrectly codedECM incorrectly coded, ECM
99 Engine control module (ECM) – incorrectly codedECM incorrectly coded, ECM
 
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