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.
Brake Pedal Position (BPP) Switch
The BPP switch is used by the PCM to disengage the transmission torque converter clutch and on some applications as an input to the idle speed control for idle quality and for vehicle speed control deactivation. Depending on the vehicle application the BPP switch can be connected to the PCM in the following manner:
- BPP switch is hard wired to the PCM supplying battery positive voltage (B+) when the vehicle brake pedal is applied.
- BPP switch is hard wired to a module (ABS, LCM, or REM), the BPP signal is then broadcast over the data link to be received by the PCM.
- BPP switch is hard wired to the anti-lock brake system (ABS) traction control/stability assist module. The stability module will interpret the BPP switch input along with other ABS inputs and generate an output called the driver brake application (DBA) signal. The DBA signal is than sent to the PCM and to other BPP signal users.
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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.