Mirror Passenger Vertical Feedback Potentiometer Circuit Open
The passenger side mirror's vertical position sensor has lost electrical connection, like a broken wire preventing the mirror from reporting its angle to the vehicle's computer. The system can't detect whether the mirror is moving up or down.
The ECU monitors the potentiometer's analog voltage signal (0-5V) as the mirror moves vertically, expecting a smooth voltage sweep. When the circuit opens, no signal reaches the ECU, triggering the fault. The system continuously tests for valid voltage within expected operating range during mirror operation.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Potentiometer Voltage | 0.5V - 4.5V (varies with position) | No signal detected or out-of-range (<0.1V or >4.9V) |
| Circuit Continuity | Resistance 1kΩ - 100kΩ | Open circuit (infinite resistance) |
Code B2317 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, B2317 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.