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General Motors Diagnostic Codes, Trouble Codes and Descriptions

WesTech Auto

Diagnostic Codes

General Motors

1994-1995 3.1L Fuel Injection, VIN M
13 Oxygen sensor voltage stays between 0.35 and 0.55 volts for 30 seconds when the TPS signal was above 3%. The engine had been operating in a closed loop with an engine temperature above 149° F.
14 Coolant temperature sensor signal indicates a temperature of over 275° F after the engine had been running for at least 10 seconds.
15 Coolant temperature sensor signal indicates a temperature colder than -38° F for 2 seconds.
16 Charging system voltage was below 8 volts for 5 seconds when engine speed was above 1000 RPM.
17 PCM did not detect any cam reference pulses for 3 seconds while engine was running.
21 TPS voltage was above 3.8 volts for 5 seconds when engine was running above 600 RPM.
22 TPS voltage was under 0.2 volts for 3 seconds when the engine was running at 400 RPM or more.
23 Inlet air temperature sensor signal showed an air temperature of -36° F for 4 minutes.
24 Vehicle speed sensor signal showed less than 5 MPH for 4 seconds when engine speed was greater than 3000 RPM and transmission was not in park or neutral.
25 Inlet air temperature sensor signal showed an air temperature over 297 F for 5 seconds when I vehicle speed was greater than 1 MPH.
28 Transaxle range switch had incorrect signal for 10 seconds.
32 Digital EGR calibrated response in manifold pressure was not seen by ECM.
33 MAP sensor signal voltage was too high (low vacuum) for 4 seconds when throttle angle was between 3% and 30% and held steady.
34 MAP sensor signal voltage was too low (high vacuum) for 2.5 seconds when engine speed was above 500 RPM.
35 Idle speed was either above or below desired idle by 350 RPM for 50 seconds.
36 PCM did not detect 6 or more consecutive 24X (crank reference) pulses.
37 PCM did not receive the TCC brake signal 4 consecutive times when vehicle speed went from above 35 MPH (for at least 10 seconds) to 0 MPH.
41 The EST signal was present when the circuit should have been grounded by the ignition module when it received bypass voltage under 1 volt.
42 The EST signal did not change when the ECM applied bypass voltage to the ignition module.
43 The ECM detected knock sensor voltage above 4.6 volts or below 0.84 volts for 10 seconds during hard acceleration with engine speed between 3400 and 4400 RPM.
44 Oxygen sensor voltage was under 0.25 volts for 60 seconds of closed loop operation.
45 Oxygen sensor voltage was over 0.75 volts for 60 seconds of closed loop operation.
51 PROM error.
53 Charging system voltage was greater than 16.5 volts.
54 Fuel pump voltage was above 14 volts or less than 7 volts for 3 seconds.
72 Vehicle speed sensor indicated a sudden change in speed of more than 33 MPH in 2 seconds when vehicle was in gear.
75 Digital EGR solenoid 1 failed 3 consecutive times. Engine speed was between 1400 and 2000 RPM when throttle angle was 0% and the MAP sensor showed high manifold vacuum.
76 Digital EGR solenoid 2 failed 3 consecutive times. Engine speed was between 1400 and 2000 RPM when throttle angle was 0% and the MAP sensor showed high manifold vacuum.
77 Digital EGR solenoid 3 failed 3 consecutive times. Engine speed was between 1400 and 2000 RPM when throttle angle was 0% and the MAP sensor showed high manifold vacuum.
82 3X reference pulses were not detected by PCM during cranking.
90 TCC solenoid voltage stayed high for 2 seconds after it was turned ON by the PCM, or the TCC solenoid voltage was 0 volts for 2 seconds after it was turned OFF by the PCM.
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