Code U0243 indicates that the vehicle's primary communication network has lost contact with the Parking Assist Control Module B. This means the computer responsible for managing specific parking sensors or cameras is not sending or receiving data on the CAN bus.
Physical damage, corrosion, or rodent chewing of the wiring connecting the module to the network, often occurring in the bumper or lower chassis areas.
A blown fuse or faulty relay preventing the Parking Assist Control Module B from powering up and communicating.
Internal electronic failure of the Parking Assist Control Module B itself.
Shorts or open circuits in the vehicle's communication network causing data packets to be lost.
A failure in the main engine control module's communication gateway, though this is extremely rare for this specific code.
Yes, the vehicle remains drivable, but the parking assistance and safety alerts will be non-functional.
No. While the PCM manages the network, U0243 is almost always caused by a local wiring issue or a failure within the specific parking module, not the PCM.
Many vehicles use multiple modules to manage different zones of the car (e.g., front vs. rear sensors) or different functions of the parking system.