U0544 code meaning
Invalid Data Received From Parking Assist Control Module B
What U0544 means
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.
U0544 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0544
- Parking sensors or park assist switched off with warning
- Automatic parking manoeuvre not available
- Transmission control unit stores the code (Mercedes DCT)
Common causes of U0544
- PossibleInternal or software fault in parking assist module B
- PossibleMessages from module B missing or delayed (bus fault, module reset)
- Less likelyDamaged bumper harness or sensors causing module B to send invalid data
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Parking assist module b
What each part of U0544 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 44 | The exact fault in that area. |
What to do next
- Note U0544 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U0544
What does U0544 mean?
U0544 means "Invalid Data Received From Parking Assist Control Module B". Parking assist control modules evaluate the ultrasonic sensors in the bumpers and work out distances or steering paths. It is a generic code, so it means the same on every make.
Is it safe to drive with U0544?
U0544 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0544 fail an emissions test?
U0544 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U0544 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. This is a job for a workshop.
Will U0544 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.