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 MANUALSCHEVROLET1993SPORTVAN G30, VAN PASSENGER, 7.4 NREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 28 (ENGINE CONTROLS - TESTS W/CODES - ELECTRONIC TRANSMISSION)
1993 Chevrolet Sportvan G30, Van Passenger, 7.4 N
Section 28 (Engine Controls - Tests W/Codes - Electronic Transmission)
1993 Chevrolet Sportvan G30, Van Passenger, 7.4 NSECTION Section 28 (Engine Controls - Tests W/Codes - Electronic Transmission)
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
- Introduction
- Self-Diagnostic System
- Trouble Code Charts
- Notes
- Code 24, VSS Trans Output Signal - "C" & "K" Series Diesel
- Code 28, Transmission Range Pressure Switch
- Codes 37/38, TCC Brake Switch On/Off
- Code 39, TCC Stuck Off
- Code 52/53, System Voltage High
- Code 58, Transmission Fluid Temperature High
- Code 59, Transmission Fluid Temperature Low
- Code 66, 3-2 Control Solenoid Circuit Fault
- Code 67, TCC Solenoid Circuit Check
- Code 68, Overdrive Ratio Error
- Code 69, Torque Converter Clutch Stuck On
- Code 72, VSS CKT Loss Transmission Output Signal - Diesel
- Code 73, Pressure Control Solenoid (Current Error)
- Code 74, Transmission Input Speed Error
- Code 75, System Voltage Low
- Note On INTERMITTENTS
- Code 79, Transmission Fluid Temperature High
- Code 81, Transmission 2-3 Error
- Code 82, Transmission 1-2 Error
- Code 83, TCC Solenoid Circuit Fault
- Code 85, Undefined Gear Ratio
- Code 86, Low Gear Ratio Error
- Code 87, High Gear Ratio Error
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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.