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.
Control Module/Gear-Shift Position Sensor
The transmission control module and the gear-shift position sensor form one unit. This unit is mounted on the top of the transmission housing, on the gear shift linkage rod. The control module connector is directly connected to the transmission.
The gear-shift position sensor provides the transmission control module with information about the gear selected and whether back-up gear is selected so that the back-up lamps can be lit if required. The gear-shift position sensor contains a permanent magnet and a linear Hall sensor. The gear-shift position sensor generates a signal voltage between 0 and 5 V. This signal voltage corresponds to the currently selected gear selector lever position.
There are diagnostics for the gear-shift position sensor.
Voltage level for the different gears
≈ 0.65 V
≈ 1.64 V
≈ 2.12 V
≈ 2.49 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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