Liftgate Door Unlock Actuator Circuit Malfunction
The B0319 code means the vehicle's onboard diagnostic system has detected: Liftgate Door Unlock Actuator Circuit Malfunction. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $80 - $350 (parts and labor)
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Common Symptoms
- Liftgate door will not lock electronically
- Liftgate door lock makes clicking noise
- Key fob does not operate liftgate lock
- Liftgate lock indicator incorrect on dash
Probable Causes (Ranked by Likelihood)
- Faulty liftgate door lock actuator Very High
- Damaged wiring in liftgate door High
- Door lock relay failure Moderate
- BCM door lock output fault Low
Step-by-Step Diagnostic Procedure
-
Test liftgate lock actuator with direct power
-
Check wiring through liftgate door boot
-
Verify BCM lock command with scan tool
-
Inspect door lock relay operation
Frequently Asked Questions
Why does only one door not lock?
A single door lock failure usually indicates a faulty actuator or broken wiring specific to that door.
Can I lock the door manually?
Yes, most vehicles allow manual locking with the interior lock button or key, even when the electronic actuator fails.
How long does actuator replacement take?
Typically 1-2 hours as the door panel must be removed to access the lock assembly.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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