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.
Throttle Position (TP) Sensor
The throttle position (TP) sensor is located on the throttle body.
It supplies information to the powertrain control module (PCM) about the position of the throttle plate. The TCM receives the signal from the PCM.
It also detects the speed of actuation of the throttle plate.
The TCM uses the signals for the following functions, among other things:
- To determine the shift timing.
- To control the main line pressure.
- To control the torque converter clutch.
- For kickdown.
In case of absence of the TP signal, the engine control uses the signals of the mass air flow (MAF) and intake air temperature (IAT) sensors as a substitute signal. The main line pressure is increased and hard shifts may occur.
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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.