OBD-II code · Chassis
C056C Brake Pressure Sensor B Intermittent/Erratic
Intermittent signal from brake pressure sensor B.
Is it safe to drive with C056C?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyConnector loose or chafed wiring
- Less likelyConnector with intermittent contact under vibration
- Less likelyHarness routed against vibrating component
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–4 h
- Emissions test
- Usually unaffected
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Brake Pressure Sensor B
Related codes
- C056BBrake Pressure Sensor A Intermittent/Erratic
- C0569Brake Booster Solenoid Circuit Performance
- C056ABrake Booster Pressure Sensor Power Supply Circuit
- C056DBrake Pedal Position Sensor Supply Voltage Circuit Low
- C056EBrake Pedal Position Sensor Supply Voltage Circuit High
- C056FBrake Booster Travel Sensor Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.