Code B2320 indicates that the vehicle's control module has detected an electrical fault in the horizontal position sensor (potentiometer) of the side-view mirror. This sensor provides feedback to the system to determine the exact angle of the mirror glass during adjustment.
The internal resistive element of the horizontal feedback sensor has worn out or failed, sending an out-of-range signal.
Corroded, frayed, or broken wires within the door harness or mirror housing causing an open or short circuit.
Debris or ice trapped in the mirror housing preventing the glass from moving, causing a signal mismatch between the motor and the sensor.
Moisture intrusion at the mirror connector leading to high resistance or intermittent connectivity.
The door control module or body control module is unable to process the sensor signal correctly.
In most modern vehicles, the potentiometer is integrated into the mirror assembly and cannot be replaced separately; the entire mirror unit is typically replaced.
No. This is a body electronics code handled by the Body Control Module (BCM) or a Door Module, not the PCM. Replacing the engine computer will not fix this issue.
If the failure is caused by external debris jamming the mechanism, cleaning may resolve it, but it will not fix an internal electrical failure of the sensor.