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 Control Switch (TCS)
The Transmission Control Switch (TCS) is a momentary contact switch that is located on the transmission selector lever. The Transmission Control Indicator Lamp (TCIL) is located in the Instrument Cluster (IC). Pushing the TCS will either disengage or engage the Overdrive (O/D) function of the transmission. When O/D is disengaged, the TCIL will illuminate the word OFF. Each time the ignition switch is placed in the RUN position, the transmission will automatically provide O/D operation regardless of TCS position the last time the vehicle was running.
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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.