U0443Invalid Data Received From Body Control Module B
- Generic OBD-II code · Network
- How the car detects it
- U0443 is set when a receiver gets frames from body control module B but rejects their content. The letters B to E come into play when a vehicle spreads body electronics such as lighting, locks, wipers or power distribution over several controllers; module A has U0431, a single BCM U0422, and lost contact with B is U0142. No car maker explains publicly which unit carries the letter B. Harley-Davidson uses the code on motorcycles: bulletin M1619 reports U04438F (failure type 8F, erratic) stored by the left hand control module shortly after start-up, alongside U04318F in the right hand module. As history entries they need no repair and await new software; if they are current, normal diagnosis applies. In cars, invalid data from module B tends to disable single comfort functions or trigger warnings.
- What you may notice
- Single comfort or lighting functions unavailable
- Code stored as history right after start-up without complaint
- Likely causes
- LikelySoftware of module B or of the receiver sets the code without a real fault
- PossibleLoose connector or damaged network wiring at body control module B
- RareSupply or ground problem at body control module B
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.