DTC code
B0004
Driver Knee Bolster Deployment Control
Technical guide
reference — not individually verifiedSymptoms
- Warning light or symbol related to the affected system
- Comfort or safety function impaired
Probable causes
- high: Clock spring conductor partially worn
- medium: Oxidized airbag connector pins
- low: Driver airbag module internal fault
Diagnostic steps
Check the components involved: driver airbag module, clock spring, srs wiring. Verify wiring and connectors before replacing any part. Job difficulty: hard (workshop equipment required). Typical European range — 150-1000 EUR, 0.8-3 h. Reference values only.
Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.
AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.
0 confirmed cases on B0004
Nothing confirmed yet for this code. No guess is offered on purpose.
Open a case