Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1992 Chevrolet APVFACTORY OEM SERVICE PROCEDURE
Engine Controls - Tests W/Codes - Gasoline
- Introduction
- Self-Diagnostic System
- Trouble Codes
- Code 13, Open Oxygen Sensor Circuit
- Code 14, Coolant Sensor Signal Voltage Low
- Code 15, Coolant Sensor Signal Voltage High
- Code 16, System Voltage High/Low 3.8L
- CODE 17, rpm signal problem 3.8l
- CODE 18, CAM/CRANK ERROR 3.8l
- Code 21, TPS Signal Voltage High
- Code 22, TPS Signal Voltage Low
- Code 24, Vehicle Speed Sensor (3.1L)
- Code 24, Vehicle Speed Sensor (VSS) 3.8L
- Code 26, Quad-Driver Circuit 3.8L (1 Of 3)
- Code 26, Quad-Driver Circuit 3.8L (2 Of 3)
- Code 26, Quad-Driver Circuit 3.8L (3 Of 3)
- Code 31, Park/Neutral Switch Circuit 3.8L
- Code 32, EGR System Error (3.1L)
- Code 33, Map Sensor Signal Voltage High
- Code 34, Map Sensor Signal Voltage Low
- Code 34, MAF Sensor Signal Voltage Low 3.8L
- Code 36, Shift Control Problem (3.8L)
- Code 38, Brake Switch Circuit (3.8L)
- Code 39, TCC Circuit (3.8L)
- Code 41, Cam Sensor Circuit (3.8L)
- Code 42, Electronic Spark Timing (3.1L)
- Code 42, Electronic Spark Timing (3.8L)
- Code 43, Electronic Spark Control (3.1L)
- Code 44, Lean Exhaust Indication
- Code 45, Rich Exhaust Indication
- Code 51, Faulty Prom/Mem-Cal
- Code 52, Faulty CALPAK (Except 2.5L)
- Code 55, ECM/Pcm Error (Except 2.5L)
- Code 54, Fuel Pump Circuit
- Code 56, Quad-Driver "B" Fault 3.8L (1 Of 2)
- Quad-Driver Related Symptoms
- Code 56, Quad-Driver "B" Fault 3.8L (2 Of 2)
- Code 61, Cruise Vent Solenoid 3.8L
- Code 62, Cruise Vacuum Solenoid 3.8L
- Code 63, Cruise System Problem 3.8L
- Code 65, Cruise Servo Position 3.8L
- Code 66, Low A/C Refrigerant Charge 3.8L
- Code 67, Cruise Engage Switches 3.8L
- Code 68, Cruise System Problem Using Tech 1 (3.8L)
- Code 69, A/C Head Pressure Switch 3.8L
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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