OBD2 code B0309: Window regulators and mirrors
Window regulator or mirror fault.
Detected Root Component
Body Component
Observed Symptoms
- Inoperative window regulator
- Faulty central locking
Possible Causes
- Faulty BCM module
- Blown fuse
- Damaged wiring
Tools Required
Interactive Diagnostic
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Diagnostic Result
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Parts likely to be the cause (Boîtier fusibles / BSI)
Boîtier fusibles / BSI
Photo d'illustration : Boîtier fusibles / BSI
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Frequently asked questions about code B0309
What does code B0309 mean? ▾
OBD2 code B0309: Window regulators and mirrors. Window regulator or mirror fault.
What are the symptoms of code B0309? ▾
Code B0309 may cause: Inoperative window regulator, Faulty central locking. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code B0309? ▾
The most common causes of code B0309 are: Faulty BCM module, Blown fuse, Damaged wiring. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code B0309? ▾
Code B0309 is generally benign (Info). It does not prevent driving, but a check helps rule out related issues.
How do I fix code B0309? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Faulty BCM module, Blown fuse, Damaged wiring. Difficulty: Easy · Estimated time: 30-60min.