Chassis
generic / SAE
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).
SystemChassis
Typegeneric / SAE
GroupC0
Range / number5 / 7F
Possible causes
- Phase wire open or motor winding open high
- Pin pushed back out of connector body low
- Cracked solder joint inside the module or sensor low
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 400–2500 €
- Estimated time: 2–6 h
- Component: brake booster motor a
- Component: motor phase wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012