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.
Gear Position Sensor
The gear position sensor is integrated with the transmission control module (TCM) as one unit.
The gear position sensor informs the transmission control module (TCM) on the gear selected, and whether reverse gear is engaged to light the reversing light. The gear position sensor contains a permanent magnet and two linear Hall sensors. The gear position sensor creates a signal voltage of between 0 and 5 V which equates to current gear selector lever position.
The gear position sensor can be diagnosed.
Voltage level for the different gear positions.
P ≈ 0.65 V
R ≈ 1.64 V
N ≈ 2.12 V
D ≈ 2.62 V
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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.
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