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 Switch
Brake Pedal Position (BPP) switch is either hard wired to PCM and brakelight circuit, or broadcast over the Standard Corporate Protocol (SCP) network via another module to be received by PCM. The BPP input is used by PCM to disengage torque converter clutch and on some applications as an input for idle speed control for idle quality. If all brakelights are burned out (open circuit) on applications where BPP switch is hard wired to PCM, high voltage will be present at PCM due to a pull-up resistor in PCM, providing engine with fail-safe operation.
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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.