U0431Invalid Data Received From Body Control Module A
- Generic OBD-II code · Network
- How the car detects it
- U0431 points at body control module A on vehicles that split body functions over several controllers; with a single BCM the code is U0422, and units B to E have U0443 to U0446. Mitsubishi documents it in the all-wheel-drive ECU, which reads body data from the ETACS unit, among them the stop light switch, and sets U0431 when that signal is abnormal; CAN lines and ETACS codes are checked before the AWD unit is replaced. Its bulletin TSB-18-23-001 (2014-18 Outlander with AWC, built before 1 March 2018) reflashes the AWC ECU when the 4WD warning comes on with U0431. Audi finds U043100 in the gateway of 2023-24 e-tron and Q8 e-tron models with an ignition that refuses to switch on, and updates comfort central module J393. U0141 is lost contact, U0331 software.
- What you may notice
- All-wheel-drive or 4WD warning lamp on
- Ignition or comfort functions do not switch on
- Further body-related warnings in the cluster
- Likely causes
- LikelySoftware of the receiving module (e.g. AWD unit) misreads body data, reflash needed
- PossibleBody control module A software or coding faulty
- RareSupply or ground problem at body control module A
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.