B11F5 — Body Control Module Configuration Mismatch

Causes

• BCM software/calibration version does not match vehicle configuration
• BCM was replaced and not programmed or configured correctly
• Corrupted BCM memory or lost configuration data after a battery disconnect or power event
• Faulty or intermittent CAN/LIN network communication between modules
• Aftermarket modules or accessories altering network or configuration data
• Incorrect VIN or vehicle option coding stored in BCM

Symptoms

• Multiple body systems inoperative or behaving incorrectly (lights, locks, windows, wipers)
• Warning lights or message indicating module programming/configuration required
• Loss of communication with BCM on diagnostic tool or intermittent communication
• Incorrect or missing features tied to vehicle option coding
• Vehicle may enter limp mode for some body functions or disable comfort features

What to check

• Use an OEM-capable scan tool to read BCM software part numbers, calibration IDs, and compare with vehicle build data
• Check for other communication-related DTCs (U-codes) and note their freeze frame data
• Inspect BCM connectors and CAN/LIN wiring for corrosion, damage, or poor pin contact
• Verify battery voltage and charging system stability before attempting programming
• Ask about recent repairs, module replacements, battery replacement, or aftermarket device installations
• Check vehicle VIN, option codes, and module coding stored in BCM for mismatches

Signal parameters

• BCM software/calibration part number and version — should match OEM build data
• BCM coding/option bytes — verify VIN and option flags
• CAN bus message presence and frequency from key modules (ECM, ABS, BCM) — messages per second
• CAN bus voltage idle (approx. 2.5 V differential for high-speed CAN) and dominant/recessive states
• Module wake/sleep state and bus activity during wake attempts
• Last programmed date/time and programming tool session logs (if available)

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