Power Door Lock Circuit Malfunction
What does B1300 mean?
The B1300 code means the vehicle's onboard diagnostic system has detected: Power Door Lock Circuit Malfunction. This is a low severity code.
Common Symptoms
- Power door locks not responding to button press
- One or more doors not locking or unlocking electrically
- Door lock switch intermittent
- Remote key fob lock/unlock not working
- Clicking noise from door without lock movement
Probable Causes (Ranked by Likelihood)
- Failed door lock actuator motor Very High
- Faulty door lock switch High
- Damaged wiring in door jamb area Moderate
- Blown door lock fuse or relay Moderate
- Body control module output fault Low
Step-by-Step Diagnostic Procedure
-
Check door lock fuse and relay
-
Test door lock switch inputs with scan tool
-
Listen for actuator clicking inside affected door
-
Inspect wiring through door jamb boot for breaks
-
Test door lock actuator by applying direct power
Frequently Asked Questions
Why does the lock click but not move?
A clicking sound without lock movement usually means the actuator motor is working but its internal gears or linkage rod have broken, preventing it from engaging the lock mechanism.
Can I still lock the door manually?
Yes. In most cases, the manual lock knob or key cylinder will still work even when the power lock actuator has failed.
Is the door lock actuator inside the door?
Yes. The actuator is mounted inside the door panel and connects to the lock mechanism via a linkage rod. Replacing it requires removing the inner door panel.