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 MANUALSCHEVROLET1996SPORTVAN VAN PASSENGER EXTENDED, 6.5 YREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 51 (ENGINE CONTROLS - TESTS W/CODES - 7.4L)TROUBLE CODE CHARTSCODE 68, OVERDRIVE RATIO ERROR - 4L80-E TRANSMISSIONNOTES
1996 Chevrolet Sportvan Van Passenger Extended, 6.5 Y
Code 68, Overdrive Ratio Error - 4L80-E Transmission: Notes
1996 Chevrolet Sportvan Van Passenger Extended, 6.5 YSECTION Notes
WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 1995 GMC Vandura Special, 1995 GMC Vandura, 1995 GMC Suburban, 1995 GMC Rally Camper Special, and 1995 GMC Rally. However, it is still accessible from the selected car via links, so may be relevant.
Control module monitors the difference in engine RPM and input shaft RPM. With transmission in Drive, scan tester reading should show engine speed closely matching input speed.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks indicated range signal to selected range. A faulty switch could set this code.
- Checks TCC for slippage while in a commanded lock-up state.
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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.