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.
Code 80/90, Transaxle Component Slipping: Notes
1994 Chevrolet Lumina BaseSECTION Notes
PCM monitors difference between engine speed and transaxle input shaft speed. With selector in D3 or D4 (indicated gear 3 or 4), and TCC is locked, scan should display engine speed closely matching input speed.
NOTE:
Test numbers refer to numbers on diagnostic chart.
- Checks for a shorted internal transaxle harness or TCC solenoid.
- Checks for open in power supply to TCC solenoid.
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.