U0544 is a network communication code indicating the powertrain control module received invalid or corrupted data from the Parking Assist Control Module B. This is a U-code (diagnostic trouble code for vehicle network issues), not a sensor or actuator failure. The parking assist system will typically be inoperative when this code is set.
The module itself has internal electrical failure causing it to send corrupted data onto the network bus.
Damaged, corroded, or loose wiring/connectors between the parking assist module and the vehicle network can corrupt data transmission.
Blown fuse, poor fuse connection, or voltage drop to the parking assist module can cause it to send invalid data.
Insufficient ground at the module can cause electrical instability and corrupted network communications.
Other modules on the network may be causing bus conflicts or interference, though less common.
Rarely, the receiving computer may misinterpret valid data; this is the least likely cause and should be investigated only after all other possibilities are ruled out.
Almost never. The PCM/ECM is rarely the cause of U0544. The issue is almost always the parking assist module itself, its wiring, power, or ground. Technicians who immediately suggest PCM replacement are likely incorrect.
Yes, the vehicle remains drivable. The parking assist, backup camera, and parking sensors will be disabled, but this is a convenience feature, not a safety-critical system for driving.
Costs vary widely. Wiring connector repair or fuse replacement may be inexpensive. Module replacement can be costly depending on the vehicle make and model.
No. If the underlying cause (failed module, wiring issue, power/ground problem) is not repaired, the code will return. Clearing the code only temporarily masks the problem.