C0110
ABS Pump Motor Circuit Malfunction
The ABS control module has detected a fault in the hydraulic pump motor circuit. The pump rebuilds brake pressure during ABS regulation — without it, ABS and stability control are disabled.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: hard
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- ABS pump motor failed (worn brushes, seized)Common
- ABS pump relay failedPossible
- Power supply wiring or fuse faultLess likely
Parts involved
- ABS Pump Motor
- ABS Control Module
- ABS Relay
- Power Supply Wiring
C0110 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.