U045CInvalid Data Received From Power Steering Control Module B
- Generic OBD-II code · Network
- Can trigger limp mode
- How the car detects it
- Power steering module B is the second controller of a redundant electric steering system. Bosch presented a fail-operational EPS for highly automated driving in 2017: if one path fails, the system can still steer the car to a safe stop or spare the driver a sudden rise in steering effort. U045C is set when the partner, typically steering module A or the automation computer, gets messages from B but finds them invalid, for instance a frozen counter or a mismatching CRC under AUTOSAR end-to-end protection; complete silence from B is U015B, and invalid data from module A is U0420. No manufacturer documents U045C publicly. Assisted steering usually continues on path A, but a steering warning and blocked automated steering are likely until the cause is found.
- What you may notice
- Steering system warning
- Lane centring or automated steering unavailable
- Steering assist reduced in some cases
- Likely causes
- LikelySoftware or calibration of steering module B not matching module A
- PossibleVoltage dips or poor ground at the second steering path
- RareInternal fault of steering module B
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.