Passenger Rear Door Ajar Circuit Open
The vehicle's computer detected that the passenger rear door ajar sensor circuit is broken or disconnected, like a light switch that no longer sends a signal when flipped. The ECU can't tell if the door is open or closed because the electrical pathway is interrupted.
The ECU monitors the door ajar switch circuit for voltage changes when the door opens and closes. It expects a signal transition from closed (high voltage) to open (low voltage). When the circuit is broken or the switch fails, the ECU receives no signal, triggering the fault code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Door Ajar Switch Signal | 0V (door open) to 12V (door closed) transition | Open circuit - no voltage change detected |
| Circuit Continuity | < 5 ohms resistance | > 10 ohms or infinite resistance |
Code B2245 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, B2245 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.