Chassis
generic / SAE
C0591
Brake Booster Motor A Phase U-V-W Current Low
Brake booster motor A phase current below expected range — possibly motor not running, or load disconnected.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number5 / 91
Possible causes
- Motor circuit open or load disconnected high
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
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012