Mirror Driver Vertical Feedback Potentiometer Circuit Failure
The side mirror's up-and-down position sensor is sending a bad signal to the vehicle's computer, like a broken volume knob that doesn't tell the stereo how loud it actually is. The mirror motor can't properly adjust or stop at the right height.
The ECU monitors the potentiometer voltage feedback from the mirror's vertical actuator to confirm the mirror reaches the commanded position. It compares the analog voltage signal against expected ranges for each position; if voltage stays out of spec or doesn't change when movement is commanded, the fault triggers.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Potentiometer Voltage | 0.5–4.5V (varies with mirror height) | Below 0.2V, above 4.8V, or static when movement commanded |
| Voltage Change Rate | Smooth linear change during motor operation | No change detected or erratic jumps during command |
Code B2324 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.
Once the fault is repaired, B2324 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.