U0445Invalid Data Received From Body Control Module D
- Generic OBD-II code · Network
- How the car detects it
- U0445 belongs to body control module D, a fourth controller for body functions that only vehicles with heavily distributed body electronics need. A receiver sets it when D's frames arrive but their content fails range, counter or checksum tests; complete silence from D is U0144. No manufacturer documents U0445 publicly, and no maker states what D controls. That several body units can coexist in one vehicle is shown by Ford, whose 2023 F-150 trailer module monitors both the main BCM and module C (TSB 24-2116). Because the role of a D unit differs by design, the symptom depends on what it handles, from one inoperative light or lock to warnings in the cluster. Diagnosis starts with the freeze frame in the reporting module and the supply and bus wiring of module D.
- What you may notice
- A body function handled by module D works erratically or not at all
- Warning messages in the instrument cluster
- Likely causes
- PossibleSoftware of module D or of the receiver not matching after an update
- PossibleDamaged bus wiring or corroded connector on the branch to module D
- RareInternal fault or poor supply at body control module D
- Repair
- Workshop only · 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.