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.
Transmission Overdrive/Override (OD/OR) Switch (A/T Models)
On models with Overdrive (OD), PCM regulates 3-4 OD upshift and downshift through OD solenoid. Transmission OD/OR switch is mounted in instrument panel. OD/OR switch is normally closed. If OD/OR switch is depressed and it opens, transmission will not enter OD. Transmission will downshift if it is in OD and OD/OR switch is depressed.
OD/OR switch circuit includes a transmission fluid temperature sensor. If this sensor opens, transmission will not shift into overdrive, or will downshift if already in overdrive. For additional information, see appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.
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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.