U05BAInvalid Data Received From Rear Radar Module D
- Generic OBD-II code · Network
- How the car detects it
- Rear radar module D is the fourth unit in the rear numbering and is reserved for layouts with an unusually dense sensor set at the back. Neither U05BA nor the matching lost-communication code U02B9 is described by any manufacturer in public, so there are no published thresholds or fitting positions. The code says that module D transmits, but the receiving assistance controller treats its frames as invalid, for instance due to a failed checksum or counter, an implausible status or a sensor that was never coded. Because radar functions such as parking help, exit warning and lane change support can draw on several rear sensors, a single faulty unit usually degrades only part of them. Mercedes-Benz shows for rear modules A and B that calibration rather than replacement is often the cure.
- What you may notice
- Individual rear warnings such as exit warning not available
- Assistance message in the instrument cluster
- Likely causes
- PossibleRear radar D not coded to the vehicle
- PossibleAssistance controller software rejects data from module D
- RareRear radar D internally defective
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.