Mirror Passenger Horizontal Feedback Potentiometer Circuit Open
The passenger side mirror's position feedback sensor has lost electrical connection, so the car can't tell where the mirror is pointing. It's like a volume knob that stopped sending signals back to confirm its position.
The ECU monitors the potentiometer voltage feedback from the passenger mirror's horizontal adjustment motor to verify mirror position. When voltage signal is absent or out of range, the ECU detects an open circuit condition. The module expects a varying analog voltage (0-5V) that correlates to mirror position feedback.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Potentiometer Voltage | 0.5V to 4.5V (varying with position) | Below 0.1V or above 4.9V (open circuit) |
| Signal Continuity | Continuous voltage sweep during adjustment | No signal or erratic dropouts |
Code B2313 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, B2313 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.