P00FF — Body Control Module Requested MIL Illumination

The catalogue describes P00FF as a malfunction-indicator request involving the body control module; it is not proof that the BCM needs replacement. GM preliminary bulletin PIT6281A (9 January 2025) documents P00FF in the ECM alongside BCM code U1962 on specified 2025 Cadillac, Chevrolet and GMC SUVs in North America. GM reported the cause under investigation and advises an OEM-guided retest and, only if needed, a serial-data authentication configuration; it specifically cautions against replacing the BCM or telematics module for that case.

Affected system: Powertrain warning request and inter-module communication

Symptoms

• Warning light may illuminate
• Related system function may be impaired
• Vehicle-specific symptoms vary

Possible causes

• Implausible sensor or switch signal, poor ground, connector corrosion, or wiring damage
• Related wiring, connector, power or ground fault
• Vehicle-specific mechanical or control issue

What to check

• Record stored and pending codes and freeze-frame data
• Compare the named sensor or switch signal with actual operating conditions; inspect the connector, reference supply, ground and harness.
• Confirm measured values against the vehicle service information
• Retest under the conditions that set the code
• Compare the named sensor or switch signal with actual operating conditions; inspect the connector, reference supply, ground and harness.
• Repair the verified cause and confirm the code does not return

Also written as: P00FF-00, P00FF00, PO0FF (some scan tools add the fault-type byte, e.g. -00).