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)
- Battery 1
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Displays 0.0-25.5 V. This parameter is the system voltage measured by the BCM at the BCM battery input.
- Power Model
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Displays OFF/ACCY/RUN/CRANK. This parameter displays the ignition switch position.
- Shifter Unlock Fdbk
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Displays High/Low. This parameter indicates Low when the mechanical lock is engaged preventing an inadvertent shift out of the PARK position. The Display indicates High when BCM opens the controlled ground circuit of the shift lock control solenoid.
NO RELATED
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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.