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.
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HOMESERVICE MANUALSGMC1992MAGNAVAN 5.7 KREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - V8
1992 GMC Magnavan 5.7 K
Engine Controls - Tests W/Codes - V8
1992 GMC Magnavan 5.7 KSECTION Engine Controls - Tests W/Codes - V8
- Introduction
- Self-Diagnostic System
- Trouble Codes
- Code 13, Open Oxygen Sensor Circuit (Except 4.3L Turbo)
- Code 14, Coolant Sensor Signal Voltage Low
- Code 15, Coolant Sensor Signal Voltage High
- Code 21, TPS Signal Voltage High
- Code 22, TPS Signal Voltage Low
- Code 24, VSS (Except 3.1L, 3.8L & Models W/4L80-E Trans.)
- Code 24, VSS (2WD With 4L80-E Transmission)
- Code 24, VSS (4WD With 4L80-E Transmission)
- Code 32, EGR System Error (4.3L "C"/"G"/"K"/"P" Series With 4L80-E)
- Code 32, EGR System Error (All Engines W/4L80-E Except 4.3L)
- Code 32, EGR System Error (All Engines Without 4L80-E Except 3.1L, & 4.3L Turbo & CPI)
- Code 33, Map Sensor Signal Voltage High
- Code 34, Map Sensor Signal Voltage Low
- Code 42, Electronic Spark Timing (Except 3.8L)
- Code 43, Electronic Spark Control (All Engines Except 4.3L Turbo & Models With 4L80-E Trans)
- Code 43, Electronic Spark Control (4.3L Turbo & Models With 4L80-E Transmission)
- Code 44, Lean Exhaust Indication (Except 4.3L Turbo)
- Code 45, Rich Exhaust Indication (Except 4.3L Turbo)
- 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
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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.