DTC code
C004B
Brake Fluid Level Sensor/Switch Circuit/Open
Technical guide
reference — not individually verifiedSymptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Probable causes
- high: Wiring open
- low: Pin pushed back out of connector body
- low: Cracked solder joint inside the module or sensor
Diagnostic steps
Check the components involved: brake fluid level switch. Verify wiring and connectors before replacing any part. Job difficulty: easy. Typical European range — 30-200 EUR, 0.3-1 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 C004B
Nothing confirmed yet for this code. No guess is offered on purpose.
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