Rear Cargo Door Unlock Circuit Open
The rear cargo door unlock circuit has an open connection, like a broken wire in a lamp that prevents electricity from flowing. The ECU can't send the unlock signal to the door because the electrical path is interrupted.
The ECU monitors voltage and current flow in the rear cargo door unlock solenoid circuit when unlock is commanded. It expects to see current draw within normal range when the unlock button is pressed. An open circuit causes no current flow, triggering the fault code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Unlock solenoid current | 2-5 amps when activated | 0 amps or below detection threshold |
| Circuit voltage | 11-14V at solenoid | 0V or open circuit detected |
Code B2242 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, B2242 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.