Decklid Ajar Rear Door Circuit Open
The decklid (trunk) or rear door switch circuit has lost electrical connection, like a broken wire preventing the car from knowing if the trunk is open or closed. Your vehicle's computer can't receive the signal that tells it the decklid is properly latched.
The ECU monitors the decklid ajar switch circuit for a voltage signal (typically 5V when closed, 0V when open). When the circuit is open, no signal reaches the ECU, triggering the fault code. The ECU expects to see a valid voltage state transition when the decklid is operated.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Decklid Switch Signal Voltage | 0V (open) or 5V (closed) with clear state transitions | No signal detected or stuck voltage; open circuit condition |
| Circuit Resistance | Less than 10 ohms (closed circuit path) | Greater than 100 ohms or infinite resistance (open circuit) |
Code B1332 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, B1332 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.