GM OBD/OBD2 Codes >> GM 94-95 4.3L VIN Z


94-95 4.3L VIN Z
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.
Heated Oxygen Sensor (HO2S) Circuit
14 Engine Coolant Temperature (ECT) Sensor Low .
15 Engine Coolant Temperature (ECT) Sensor High .
16 Vehicle Speed Sensor (VSS) Buffer Fault .
21 Throttle Position Sensor (Signal Voltage High) .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 0.2 volts for 4 seconds when the ignition was on.
24 Vehicle Speed Sensor (VSS) Circuit Low .
Vehicle speed sensor signal showed less than 3 MPH for 2 seconds when engine speed was greater than 3000 RPM and transmission has not been in park or neutral for more than 4 seconds. Or vehicle speed goes from above 18 MPH to 0 in less than 2 seconds without applying brake.
26 Quad-Driver sense voltage shows a low voltage when battery voltage should be present, or if the sense voltage shows battery voltage when a low voltage should be present for at least 5 seconds when the engine was running.
27 2nd gear switch was closed or grounded for 10 seconds when vehicle was in 4th gear, or 2nd or 4th gear switch was open when engine was first started.
28 Transmission Range (TR) Pressure Switch Assembly Fault .
29 4th gear switch was closed or grounded for 10 seconds when vehicle was in 4th gear, or 4th gear switch was open when engine was first started.
31 PRNDL indicates a gear other than park or neutral for 13 seconds for 3 consecutive startups when ignition was on, engine was off and vehicle speed was 0. Or the PRNDL status indicators (A, B, C, P) showed an incorrect combination of Lo and Hi for more than 10 seconds.
32 Exhaust Gas Recirculation (EGR) Error
33 MAP Sensor Circuit (Signal Voltage High) .
34 There was no MAF signal for over 4 seconds while engine was running.
35 Idle Air Control (IAC) System .
36 Transmission solenoid "B" has failed in the Off position which caused transmission to be in 3rd when 1st gear was desired, or solenoid "B" failed in the On position which caused transmission to be in 1st when 3rd gear was desired.
37 Brake Switch Stuck “ON” .
38 Brake Switch Stuck “Off” .
39 The torque converter clutch portion of the brake switch was inoperative for 30 seconds causing vehicle speed ratio to be outside of its window of operation.
41 Cam sensor signal was not received by PCM for the last 5 seconds while engine was running.
42 Ignition Control (IC) Circuit .
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.
(Lean Exhaust Indicated)
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.(Rich Exhaust Indicated)
47 Momentary loss of power to Body Computer Module (BCM).
51 MEM-CAL error.
52 System Voltage High Long .
53 System Voltage High .
54 .Fuel Pump Relay .
55 Faulty PCM .
56 Quad-driver voltage was incorrect for 5 seconds on the circuit connected to QDM "B".
57 Boost control solenoid did not open bypass valve causing engine torque to be too high.
58 Transmission Fluid Temperature (TFT) Sensor Circuit Low .
59 Transmission Fluid Temp (TFT) Sensor Circuit High .
63 EGR flow was incorrect.
64 EGR flow was incorrect.
66 3-2 Control Solenoid Circuit Fault .
67 Torque Converter Clutch( TCC) Solenoid Circuit Fault .
69 Torque Converter Clutch( TCC) Solenoid Stuck “ON” .
72 Vehicle Speed Sensor (VSS) Circuit Loss .
73 Pressure Control Solenoid (PCS) Circuit (Current Error) .
75 System Voltage Low .
79 Transmission Fluid Overtemp .
81 2-3 Shift Solenoid Circuit Fault .
82 1-2 Shift Solenoid Circuit Fault

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