C056CBrake Pressure Sensor B Intermittent/Erratic
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C056C is the intermittent fault of the second brake pressure sensor, B. Which pressure B measures depends on the system – in Ford's hybrid ABS modules the two sensors read different points of the hydraulic unit, and other makers fit sensor B in a separate circuit or in the boost chamber. No maker documents C056C publicly. By analogy with sensor A (Ford C056B: corrupted sensor data or a missing control response for 70 ms), the code points to brief signal loss rather than lasting drift, which belongs under C0541. Honda's patent shows how a pressure sensor is judged: if pedal stroke rises but pressure does not follow, the sensor is deemed faulty. Typically stability functions shut down until the next start.
- What you may notice
- Sporadic ABS or stability warning
- Traction and stability control briefly unavailable
- No noticeable change in normal braking
- Likely causes
- LikelyIntermittent contact at the sensor B connector or harness
- PossibleSensor B electronics dropping out under heat or vibration
- PossiblePoor ground or unstable reference voltage
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.