Code
B1A36
Generic
B — Body
Body Control Module (BCM) Configuration/Programming Mismatch
AI status
Completed
Completed
100%
Causes
- Incorrect or incomplete BCM programming or reflash
- Replacement BCM with different part number or calibration
- Corrupted or missing VIN/calibration data in the BCM
- Interrupted programming (low battery or communication loss)
- Aftermarket modules or accessories that change configuration
- CAN bus communication errors between modules
Symptoms
- MIL or BODY warning lamp illuminated
- One or more vehicle body functions not working (doors, lighting, wipers, HVAC controls)
- Inoperative keyless entry, remote start, or alarm functions
- Incorrect or missing options in vehicle menus (comfort/lighting settings)
- Other modules report COMM or compatibility DTCs
- Occasional or permanent communication loss with BCM on a scan tool
What to check
- Retrieve freeze frame and full DTC list from BCM and other modules
- Confirm vehicle VIN and compare to BCM VIN and configuration/calibration labels
- Use manufacturer-capable scan tool to read BCM software part number and calibration level
- Check for related network codes (e.g., U0100, U0415, U0401)
- Inspect BCM connectors for corrosion, bent pins or water intrusion
- Verify battery voltage and charging system health before programming
Signal parameters
- BCM software part number / calibration ID (e.g., SW or CAL ID)
- BCM hardware/part number and serial number
- Stored VIN in BCM
- Module programming date/time or history (if available)
- Network node address and CAN bus status (bus load, error counters)
- Supply voltage during programming (battery volts)
Diagnostic algorithm
- Read and record DTCs from BCM and other control modules; note any related network codes.
- Verify vehicle VIN matches the BCM-stored VIN and that the BCM part/calibration is appropriate for the vehicle build and option content.
- Inspect physical connectors and wiring for damage, corrosion, or water ingress; repair as needed.
- Check battery state-of-charge and confirm stable voltage (use battery charger if required) before any programming attempt.
- Use a manufacturer-capable scan tool to query BCM software/hardware IDs and compare to dealership records or OEM parts database.
- If mismatch confirmed, attempt a reprogram/flash of the BCM with the correct vehicle-specific calibration and ensure programming completes without interruption.
- If reprogramming is not possible or fails repeatedly, perform BCM replacement with correct part plus dealer-level programming and VIN coding.
- After programming or replacement, clear DTCs, perform relearns/coding procedures required (key, immobilizer, modules sync), then verify all body functions and re-scan for codes.
- If issues persist after correct programming, investigate CAN bus integrity and related modules for incompatible software versions.
Likely causes
- BCM was replaced but not programmed to vehicle-specific calibration
- Dealer/scan-tool reflash failed or was aborted
- BCM contains wrong VIN or option coding from another vehicle
- Aftermarket alarm or remote start altered BCM settings
- Damaged data/power supply pins or intermittent battery voltage during programming
Fault status
Status
BCM Configuration/Programming Mismatch
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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