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 MANUALSCHEVROLET1993SUBURBAN C2500, 7.4 NREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - V8
1993 Chevrolet Suburban C2500, 7.4 N
Engine Controls - Tests W/Codes - V8
1993 Chevrolet Suburban C2500, 7.4 NSECTION Engine Controls - Tests W/Codes - V8
- Introduction
- Self-Diagnostic System
- Summary
- Notes
- Code 13, Open Oxygen Sensor Circuit
- Code 14, Coolant Sensor Signal Voltage Low
- Code 15, Coolant Sensor Signal Voltage High
- Code 16, Transmission Output Speed - 5.0L & 5.7L With 4L60E Transmission
- Code 21, TPS Signal Voltage High
- Code 22, TPS Signal Voltage Low
- DTC 24, Vehicle Speed Signal Low ("C" & "K" Series, M/T Only)
- DTC 24, Vehicle Speed Signal Low (With 4L60-E A/T)
- DTC 24, Vehicle Speed Signal Low (With 4L80-E A/T)
- Code 31, Engine Speed Governor - 5.7L "G" Series
- Code 32, EGR System Error - 5.0L & 5.7L "G" Series,
- Code 32, EGR System Error - 5.0L & 5.7L "C" & "K" Series Cal. With 4L60E Transmission & 5.7L & 7.4L "C", "G", "K" & "P" Series With 4L80-E Transmission
- Code 32, EGR System Error - 2.5L, 2.8L & 4.3L ("C", "K" & P Series), 4.3L "S" & "T" Series Pickup (Except Turbo) 5.0L ("C" & "K" Series), 5.7L ("C", "K" & P Series) & 7.4L "C" & "K" Series; All With Manual Transmission
- Code 33, Map Sensor Signal Voltage High
- Code 34, Map Sensor Signal Voltage Low
- Code 35, Idle Speed Error
- IAC Valve Reset Procedure
- Code 42, Electronic Spark Timing
- Code 43, Electronic Spark Control With Spark Control Module
- Code 43, Electronic Spark Control Without ESC Module (Single Sensor)
- Code 44, Lean Exhaust Indication
- Code 45, Rich Exhaust Indication
- Code 51, Faulty Prom/Mem-Cal
- Code 52, Faulty CALPAK
- Code 53, System OVERVOLTAGE
- Code 55, ECM/Pcm Error
- 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.