U0544Invalid Data Received From Parking Assist Control Module B
- Generic OBD-II code · Network
- How the car detects it
- Parking assist control modules evaluate the ultrasonic sensors in the bumpers and work out distances or steering paths. Mercedes-Benz lists U0544 in its Intelligent Predictive Repair guide for its eight-gear DCT (models 118, 177, 247; document LI27.00-P-077141): the transmission controller stores U054487 when data from the PARKTRONIC unit are implausible, and failure type 87 points to a missing message. Ford's 2024 OBD summary treats the A unit through U045A, monitored non-MIL inside the PCM on vehicles with Fully Aided Park Assist, which shows that powertrain controllers also check parking data. With U0544 present, expect parking sensors or automatic parking to be switched off and a warning; normal driving is not restricted. Lost communication with module B is U0243.
- What you may notice
- Parking sensors or park assist switched off with warning
- Automatic parking manoeuvre not available
- Transmission control unit stores the code (Mercedes DCT)
- Likely causes
- PossibleInternal or software fault in parking assist module B
- PossibleMessages from module B missing or delayed (bus fault, module reset)
- RareDamaged bumper harness or sensors causing module B to send invalid data
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.