OBD-II code · Chassis
C057F Brake Booster Motor A Phase U-V-W Circuit/Open
Open circuit on one of the three U/V/W phases of brake booster motor A (3-phase BLDC motor in electric brake boosters).
Is it safe to drive with C057F?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyPhase wire open or motor winding open
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
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
- 2–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Brake Booster Motor A, Motor Phase Wiring
Related codes
- C057CBrake Booster Temperature Sensor B Circuit Range/Performance
- C057DBrake Booster Temperature Sensor Circuit B Intermittent/Erratic
- C057EBrake Booster Temperature Sensor A/B Correlation
- C0580Brake Booster Motor A Phase U-V-W Circuit Low
- C0581Park Brake Apply Performance
- C0582Brake Booster Motor A Phase U-V-W Circuit Range/Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.