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.
Body Control Module
The PASS-Key(R) system is an internal function of the Body Control Module (BCM). The BCM reads the key code from the ignition cylinder when the ignition is turned to the ON position. If the code is correct, the BCM will send an enable message to the PCM via the class 2 serial data circuit. If the BCM receives the wrong code, the BCM will immediately go into tamper mode. The BCM will send a disable message to the PCM disabling the starting and fuel delivery systems.
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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.