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General Motors Diagnostic Codes, Trouble Codes and Descriptions

WesTech Auto

Diagnostic Codes

General Motors

1986-1988 3.8L Fuel Injection, VIN 3
13 Oxygen sensor voltage stays between 0.35 and 0.55 volts for 30 seconds when the TPS signal was above 0.55 volts. The engine had been running for at least 40 seconds with an engine temperature above 110° F.
14 Coolant temperature sensor signal indicates a temperature of over 284° F for 4 seconds after the engine had been running for at least 10 seconds.
15 Coolant temperature sensor signal indicates a temperature colder than -36° F for at least 4 seconds after the engine had been running for 2 seconds.
16 Charging system voltage was either below 9 volts or above 16 volts for 10 seconds.
21 TPS voltage was above 0.8 volts for 5 seconds when engine was running and air flow was less than 15 gm/sec, or the TPS voltage was over 4.8 volts at any time.
22 TPS voltage was under 0.1 volts for 4 seconds when the ignition was on.
24 Vehicle speed sensor signal showed less than 3 MPH for 40 seconds when vehicle was in 4th gear.
29 4th gear switch was closed or grounded when vehicle was in 4th gear, or 4th gear switch was open when engine was first started.
32 EGR valve did not change when the command was given during off-idle operation.
33 MAP signal was too high (low vacuum) when engine was at normal operating temperature.
34 There was no MAF signal for over 4 seconds while engine was running.
37 MAT sensor was shorted showing a high temperature of around 300° F.
38 The Torque Converter Clutch portion of the brake switch was open and caused the TCC to be inoperative.
40 Power steering switch was open when vehicle speed was 40 MPH or more.
41 Cam sensor signal was not received by PCM for the last 2 seconds while engine was running.
42 The EST signal did not change when the ECM applied bypass voltage to the ignition module.
43 Knock sensor signal was either above 3.5 volts or below 1.5 volts for at least 20 seconds.
44 Oxygen sensor voltage was under 0.25 volts for up to 4 1/2 minutes of closed loop operation.
45 Oxygen sensor voltage was over 0.750 volts for 2 minutes in closed loop operation with a throttle angle between 0.6 and 1.9 volts.
47 Momentary loss of power to Body Computer Module (BCM).
51 MEM-CAL error.
52 CALPAK error.
55 ECM error. Replace ECM.
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