Left Front Door Lock Motor Circuit Failure
There's an issue with the left front door lock motor or its circuit.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The computer is seeing that the left front door lock motor isn't responding properly when it tries to activate it. This can mean a bad motor, a wiring issue, or a connector problem.
What the computer is actually seeing
The system expects a specific voltage signal (around 12V) when the door lock motor is commanded to lock or unlock. If the voltage is low or nonexistent, it triggers the fault code.
What a healthy reading looks like
Expected voltage while locking/unlocking should be at least 10.5V. If voltage drops below that during operation, there may be a fault in the lock motor or circuit.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors at the left front door for damage or corrosion. Repair any found issues.
- 22. Check the door lock motor for proper operation. Apply 12V directly to the motor terminals and see if it functions. If it doesn't, replace the motor.
- 33. Measure the voltage at the door lock motor connector when the command to lock/unlock is given. If below 10.5V, go to step 4. If correct, suspect a wiring issue between the BCM and motor.
- 44. Check for continuity in the wiring between the BCM and the door lock motor connector. Repair any broken wires or poor connections.
Common causes
- Faulty door lock motor
- Damaged wiring or connectors in the door harness
- Faulty body control module (BCM)
- Corroded connectors in the locking mechanism
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Yes, but the left front door may not lock or unlock properly, posing a security risk.
Will this code come back after resetting?
If the underlying issue isn't fixed, yes, it will return.
Why does this code pair with B1030 and B1031?
Those codes indicate issues with other door locks, possibly due to similar wiring problems or faults in the BCM.
Working a real vehicle right now?
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