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 MANUALSCHEVROLET1995SPORTVAN G20, 6.5 PREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - TESTS W/CODES - 5.7LTROUBLE CODE CHARTSDTC 68: OVERDRIVE RATIO ERROR - 4L80-E TRANSMISSIONNOTES
1995 Chevrolet Sportvan G20, 6.5 P
DTC 68: Overdrive Ratio Error - 4L80-E Transmission: Notes
1995 Chevrolet Sportvan G20, 6.5 PSECTION Notes
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.
RENDER: 1.0x
NO RELATED
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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.