Left Rear Power Window Motor Circuit Malfunction
The B0339 code means the vehicle's onboard diagnostic system has detected: Left Rear Power Window Motor Circuit Malfunction. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $150 - $450 (parts and labor)
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Common Symptoms
- Left Rear window does not operate
- Left Rear window moves slowly
- Window switch has no effect on left rear
- Left Rear window operates intermittently
Probable Causes (Ranked by Likelihood)
- Faulty left rear window motor Very High
- Failed window regulator assembly High
- Damaged wiring in left rear door Moderate
- Window switch failure Low
Step-by-Step Diagnostic Procedure
-
Test left rear window motor with direct power
-
Check window switch continuity
-
Inspect wiring through left rear door boot
-
Verify BCM window commands
Frequently Asked Questions
Why does my window go down but not up?
This often indicates a failing motor that has enough power to lower the window with gravity assistance but cannot raise it.
Can I raise the window manually?
Some regulators allow manual assist by pressing up while activating the switch, but this is a temporary measure.
Is the regulator and motor one assembly?
In many modern vehicles, the motor and regulator are sold as a single assembly for easier replacement.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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