What Does U0431 Mean?
The receiving control module is getting invalid or corrupted data from the primary body control module over the communication network. This can affect numerous vehicle functions controlled by the BCM including lighting, wipers, locks, and climate control.
Common Causes
30%
Faulty body control module sending corrupted data
30%
Damaged or corroded CAN bus wiring or connectors to BCM
20%
Low battery voltage or poor ground connections at BCM
15%
Software corruption or version mismatch in BCM firmware
5%
Water intrusion or physical damage to BCM
Diagnostic Steps
1
Step 1: Check for multiple U-codes to determine if BCM issue is isolated or part of network-wide problem
2
Step 2: Verify battery voltage is above 12V and test all main fuses and ground connections to BCM
3
Step 3: Inspect BCM location for water intrusion, physical damage, or loose mounting
4
Step 4: Check all wiring harness connectors to BCM for corrosion, damage, or loose pins
5
Step 5: Use factory scan tool to monitor BCM data stream; check for software updates or reprogram/replace BCM as needed
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
The receiving control module is getting invalid or corrupted data from the primary body control module over the communication network. This can affect numerous vehicle functions controlled by the BCM including lighting, wipers, locks, and climate control.
The most common cause of U0431 (Invalid Data Received From Body Control Module "A") is: Faulty body control module sending corrupted data
Typical repair costs for U0431 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Multiple vehicle functions may malfunction including lights, wipers, locks, and safety systems. Exterior lighting issues present significant safety hazards for night driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0431 to identify the root cause.
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Quick Info
Category
Network
System
Body Control / Electrical System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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