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 (BCM)
The BCM is a class 2 device. It communicates with the engine control module (ECM)/powertrain control module (PCM) and the instrument panel cluster for EPM operation. The BCM determines the output of the generator and sends the information to the ECM/PCM for control of the generator field control circuit. It monitors the generator field duty cycle signal circuit information sent from the ECM/PCM for control of the generator. It monitors a battery current sensor, the battery positive voltage circuit, and estimated battery temperature to determine battery SOC. The BCM performs idle boost and load management operations.
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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.