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General Motors Diagnostic Codes, Trouble Codes and Descriptions

WesTech Auto

Diagnostic Codes

General Motors

1986 2.8L Carburetor, VIN X
12 ECM did not receive distributor reference pulses when cam pulses were being received.
13 Oxygen sensor voltage stays between 0.35 and 0.55 volts for 60 seconds during closed loop operation after the engine had been running for 4 minutes and the throttle angle was above 4%.
14 Coolant temperature sensor was shorted showing a high temperature after engine had been running for 2 minutes.
15 Coolant temperature sensor was open showing a low temperature after engine had been running for 5 minutes.
21 TPS was open showing low voltage.
22 TPS voltage was under 0.2 volts for 3 seconds when the engine was running.
23 Mixture control solenoid circuit was either open or shorted.
24 Vehicle speed sensor was out of range after vehicle had been at road speed for 2 minutes.
32 Barometric pressure sensor circuit was low.
34 MAP sensor or vacuum sensor was open or shorted.
35 Idle speed control switch circuit was shorted showing a high TPS reading for over 5 seconds.
41 ECM did not see any distributor reference pulses.
42 The EST signal did not change when the ECM applied bypass voltage to the ignition module.
43 The ESC knock signal lasted too long causing the EST signal to be retarded.
44 Oxygen sensor was lean during closed loop operation after engine had been running for 2 minutes.
45 Oxygen sensor was rich during closed loop operation after engine had been running for 2 minutes.
51 PROM error.
53 EGR valve vacuum was incorrect.
54 Mixture control solenoid circuit was shorted and/or ECM is faulty.
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