GM OBD/OBD2 Codes >> GM 93-95 4.3L VIN W

GM

93-95 4.3L VIN W
Flash Code Fault Location Probable Cause
12 Start of diagnosis No engine speed (RPM) signal received
13 Oxygen sensor (O2S), bank 1 Wiring open circuit, O2S, ECM
14 Engine coolant temperature (ECT) sensor – high temperature indicated Wiring short circuit to ground, ECT sensor, ECM
15 Engine coolant temperature (ECT) sensor – low temperature indicated Wiring open circuit, ECT sensor, ECM
16 Distributor ignition system, low resolution signal – circuit malfunction Wiring, distributor, ECM
17 Camshaft position (CMP) sensor – circuit malfunction Wiring, CMP sensor, mechanical fault, ECM
18 Injector(s) – circuit malfunction Wiring, injector(s)
21 Throttle position (TP) sensor – voltage high Wiring open circuit/short circuit to positive, TP sensor, ECM
22 Throttle position (TP) sensor – voltage low Wiring open circuit/short circuit to ground, TP sensor, ECM
23 Intake air temperature (IAT) sensor – low temperature Wiring open circuit, IAT sensor, ECM
24 Vehicle speed sensor (VSS) Wiring, VSS, ECM
25 Intake air temperature (IAT) sensor – high temperature Wiring short circuit to ground, IAT sensor, ECM
26 Evaporative emission (EVAP) canister purge valve – open/short circuit Wiring, EVAP canister purge valve, ECM
27  Exhaust gas recirculation (EGR) solenoid Wiring, poor connections, EGR valve, ECM
28  Transmission range (TR) switch Wiring, TR switch, ECM
29 Secondary air injection (AIR) pump relay – circuit malfunction Wiring, AIR pump relay, ECM
32 Exhaust gas recirculation (EGR) solenoid Wiring open circuit/short circuit to ground, EGR valve, ECM
33 Manifold absolute pressure (MAP) sensor – circuit malfunction Wiring open circuit/short circuit to positive, hose blocked/leaking, MAP sensor, ECM
34 Manifold absolute pressure (MAP) sensor – circuit malfunction Wiring open circuit/short circuit to ground, MAP sensor, ECM
35 Idle air control (IAC) valve Wiring, IAC valve, intake system leaking, fuel system, PCV valve, A/C system, mechanical fault, ECM
36 Distributor ignition system, high resolution signal – circuit malfunction Wiring, distributor, ECM
37 Brake pedal position (BPP) switch for torque converter clutch (TCC) Wiring open circuit/short circuit to ground, incorrectly adjusted BPP switch, BPP switch, ECM
38 Brake pedal position (BPP) switch/ torque converter clutch (TCC) Wiring open circuit/short circuit to ground, supply wire, BPP switch, TCC switch, ECM
39 Clutch pedal position (CPP) switch Wiring, incorrectly adjusted, CPP switch, ECM
41 Ignition control, timing signal – circuit malfunction Wiring, poor connections, ICM, ECM
42 Ignition control, bypass signal – circuit malfunction Wiring, poor connections, ICM, ECM
43 Knock sensor (KS) Wiring open circuit/short circuit to ground/short to positive, KS, ECM
44 Oxygen sensor (O2S)/heated oxygen sensor (HO2S), bank 1 – mixture lean Wiring open circuit/short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, O2S, ECM
45 Oxygen sensor (O2S)/heated oxygen sensor (HO2S), bank 1 – mixture rich Wiring open circuit, injector(s) leaking, fuel pressure high, EVAP purge valve, TP sensor, O2S, EGR system, ECM
46 Immobilizer system, code – malfunction Incorrect key, ECM
47 Knock control module, removable part in engine control module (ECM) – circuit malfunction Wiring, poor connection, missing knock control module, ECM
48 Mass airflow (MAF) sensor – no signal Wiring, poor connections, MAF sensor, ECM
51 Engine control module (ECM) – PROM Insecure PROM, incorrect PROM, ECM
52 Engine oil temperature sensor – voltage high Wiring, engine oil temperature sensor, ECM
53 System Voltage – high Alternator
54 Fuel pump circuit – voltage low Wiring 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 low Wiring short circuit to ground, TFT sensor, ECM
59 Transmission fluid temperature (TFT) sensor -voltage high Wiring open circuit, TFT sensor, ECM
61 A/C system – performance Refrigerant low, wiring, A/C refrigerant pressure sensor, A/C evaporator temperature sensor, ECM
62 Engine oil temperature sensor – voltage low Wiring, engine oil temperature sensor, ECM
63 Oxygen sensor (O2S)/heated oxygen sensor (HO2S), bank 2 Wiring open circuit, O2S/HO2S, ECM
64 Oxygen sensor (O2S)/heated oxygen sensor (HO2S), bank 2 – mixture lean Wiring open circuit/short circuit to ground, injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, O2S, ECM
65 Oxygen sensor (O2S)/heated oxygen sensor (HO2S), bank 2 – mixture rich Wiring open circuit, injector(s) leaking, fuel contamination, fuel pressure high, TP sensor, EGR system, EVAP purge valve, O2S, ECM
66 A/C refrigerant pressure sensor – voltage low Wiring open circuit/short circuit to ground, A/C refrigerant pressure sensor, ECM
67 A/C refrigerant pressure sensor – circuit malfunction Wiring open circuit, A/C refrigerant pressure sensor, ECM
68 A/C compressor clutch relay – circuit malfunction Wiring short circuit, A/C compressor clutch relay, ECM
69 A/C compressor clutch relay – circuit malfunction Wiring open circuit, A/C compressor clutch relay, ECM
70 A/C refrigerant pressure sensor – voltage high Wiring open circuit/short circuit to positive, A/C refrigerant pressure sensor, ECM
71 A/C evaporator temperature sensor – voltage high Wiring open circuit/short circuit to positive, A/C evaporator temperature sensor
72 Vehicle Speed Sensor (VSS) Wiring open circuit/short circuit to ground, VSS, ECM
73 Transmission fluid pressure (TFP) control solenoid – circuit malfunction Wiring, poor connections, TFP solenoid
74 Traction control system (TCS), active signal – malfunction Wiring short to ground, ABS/TCS, ECM
75 System voltage, engine control module (ECM) – low Wiring, battery, alternator, ECM
76 Exhaust gas recirculation (EGR) valve solenoid 2 Wiring open circuit/short circuit to ground, supply wire, EGR valve, ECM
77 Engine coolant blower motor relay – circuit malfunction Wiring, engine coolant blower blower motor relay, ECM
78 Engine coolant blower motor relay 2 – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, engine coolant blower motor relay, ECM
79 Transmission fluid temperature (TFT) – high Transmission mechanical fault, towing weight limit exceeded
80 Torque converter clutch (TCC) – slipping Wiring 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 malfunction Wiring, SS, ECM
82 Transmission shift solenoid (SS), 1st-2nd – circuit malfunction Wiring, SS, ECM
83 Torque converter clutch (TCC) solenoid, pulse width modulated – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, TCC solenoid, ECM
84 (Automatic) Transmission 3rd-2nd control solenoid – circuit malfunction Wiring, control solenoid, ECM
84 (Manual) 2nd-3rd gear inhibit relay – circuit malfunction Wiring, inhibit relay, ECM
85 Torque converter clutch (TCC) solenoid – stuck ON Wiring open circuit/short circuit to ground, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM
86 Engine control module (ECM) – analogue/digital converter A/C refrigerant pressure sensor/KS/ECT sensor/fuel pump monitor circuit short circuit to battery voltage
87 Engine control module (ECM), EEPROM – malfunction Poor connections, incorrect programming, ECM
90 Torque converter clutch (TCC) – circuit malfunction Wiring, TCC solenoid, ECM
91 Skip shift warning lamp – circuit malfunction Wiring, skip shift warning lamp, ECM
93 Transmission fluid pressure (TFP) control solenoid – circuit malfunction Wiring, poor connection, TFP solenoid
95 Change oil lamp – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, instrument panel, engine oil life lamp bulb, ECM
96 Engine oil level warning lamp – circuit malfunction Wiring open circuit/short circuit to ground/short circuit to positive, instrument panel, engine oil level lamp bulb, oil level sensor, ECM
97 Engine control module (ECM), vehicle speed sensor (VSS) output signal – circuit malfunction Wiring, poor connections, ECM
98 Engine control module (ECM) – incorrectly coded ECM incorrectly coded, ECM
99 Engine control module (ECM), tachometer output signal – circuit malfunction Wiring, poor connections, ECM
 

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