OBD-II code · Chassis
C058C Brake Booster Motor B Position Sensor Circuit Low
Brake Booster Motor B Position Sensor Circuit Low: the signal voltage is below the expected range. The electric brake booster generates the braking assist; a motor or sensor fault can reduce or disable power-assisted braking. Safety-relevant.
Is it safe to drive with C058C?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Booster Motor B Pos Sensor
Related codes
- C0588Brake Booster Motor A Position Sensor Circuit Low
- C0589Brake Booster Motor A Position Sensor Circuit High
- C058ABrake Booster Motor A Position Sensor Circuit Range/Performance
- C058BBrake Booster Motor B Position Sensor Circuit/Open
- C058DBrake Booster Motor B Position Sensor Circuit High
- C058EBrake Booster Motor B Position Sensor Circuit Range/Performance
- C058FRegeneration Torque Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.