Power Door Lock Circuit Open
The door lock system has a broken electrical connection, like a severed wire preventing power from reaching the lock mechanism. The vehicle's computer detected an open circuit where current should be flowing to operate the door locks.
The BCM monitors voltage and current draw on the door lock circuit. It expects specific current flow when the lock solenoid is commanded on. An open circuit results in zero current or voltage drop exceeding normal resistance thresholds, triggering the fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Door Lock Circuit Current | 2-5 amps when solenoid engaged | 0 amps or no measurable current |
| Circuit Voltage | 11-14.4 volts at solenoid | Battery voltage present but no drop indicates open circuit |
Code B1301 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, B1301 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.