B0004
Driver Knee Bolster Deployment Control
B0004 is an OBD-II diagnostic trouble code meaning: Driver Knee Bolster Deployment Control. Common causes: broken or damaged wiring, shock sensor malfunction. Estimated repair cost: $56–167.
Symptoms
- Airbag light is on
- Knee airbag does not deploy during testing
- Error B0004 displays when scanning
Causes
- Broken or damaged wiring
- Shock sensor malfunction
- Problems with the airbag control module
- Corrosion or oxidation of contacts
How to Fix
- Diagnose the airbag system
- Check the integrity of wiring and connectors
- Test shock sensors
- If necessary, replace the control module or other components
- Reset the error and check the system
Related codes
Error B0004 by Vehicle Brand
FAQ
What does the B0004 code mean?
B0004 is an OBD-II diagnostic trouble code that indicates: Driver Knee Bolster Deployment Control
What causes a B0004 error code?
The most common causes of B0004 include: Broken or damaged wiring; Shock sensor malfunction; Problems with the airbag control module; Corrosion or oxidation of contacts.
How do I fix a B0004 diagnostic trouble code?
To fix B0004: Diagnose the airbag system. Check the integrity of wiring and connectors. Test shock sensors. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with B0004?
Limited driving only, diagnose soon
How much does it cost to fix B0004?
The estimated repair cost for B0004 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
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