U0223 indicates that a control module (typically the body control module or door module) has lost communication with the door window motor B over the local interconnect network (LIN) bus. This means the motor is not responding to commands, often due to a failed motor, wiring issue, or a problem with the module itself.
The motor itself is the most common failure point. Internal electrical or mechanical faults prevent it from communicating or operating.
Broken wires, loose pins, or corrosion in the harness between the control module and the motor can interrupt communication.
The LIN bus is a single-wire network; a short to ground, open circuit, or missing termination resistor can cause communication loss with multiple devices.
The module that sends commands to the window motor may have an internal fault, but this is less common than motor or wiring issues.
Insufficient voltage or a bad ground at the motor or module can prevent proper communication and operation.
Non-OEM parts may not communicate correctly on the LIN bus, causing a loss of communication code.
No. U0223 is a body network code, not an engine control code. The PCM is almost never involved. Replacing the PCM will not fix this issue and is a common misdiagnosis.
Unlikely. The switch sends a request to the control module, but the code indicates the module cannot communicate with the motor itself. A faulty switch usually causes a different code or no code at all.
Clearing the code will not fix the underlying problem. The window will likely remain inoperative until the actual cause (motor, wiring, or module) is repaired.
No, it is a generic OBD-II code used by many manufacturers. However, the exact location of 'window motor B' and the network architecture can vary, so always consult the vehicle-specific service information.