Chassis
generic / SAE
C05A7
ABS Pump Motor Supply Voltage B Circuit Low
ABS pump motor supply B below expected range. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
SystemChassis
Typegeneric / SAE
GroupC0
Range / number5 / A7
Possible causes
- Weak supply or high resistance high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 10–400 €
- Estimated time: 0.3–2 h
- Component: abs pump supply b
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012