ABS Pump Motor Circuit Malfunction
What does C0110 mean?
The C0110 code means the vehicle's onboard diagnostic system has detected: ABS Pump Motor Circuit Malfunction. This is a critical severity code.
Common Symptoms
- ABS warning light on
- Buzzing or humming noise from ABS module
- ABS pump runs continuously
- Poor brake pedal feel
- Traction control light illuminated
Probable Causes (Ranked by Likelihood)
- Failed ABS pump motor Very High
- Corroded ABS pump motor relay or connector High
- ABS pump motor relay failure Moderate
- Wiring fault in pump motor circuit Moderate
- ABS hydraulic control module internal failure Low
Step-by-Step Diagnostic Procedure
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Scan for DTCs and check for related pump motor codes
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Listen for the ABS pump motor running -- continuous operation indicates a fault
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Test the ABS pump motor relay by swapping with a similar relay
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Check voltage and ground at the pump motor connector with ignition on
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Inspect wiring between the relay box and ABS module for damage
Frequently Asked Questions
Why is my ABS pump running constantly?
A continuously running ABS pump usually indicates internal pressure loss in the ABS hydraulic unit or a stuck relay. The pump keeps running trying to build pressure it cannot maintain. This will eventually burn out the motor.
Can I just replace the ABS pump motor?
On some vehicles the pump motor is replaceable separately from the hydraulic unit. On others, the entire ABS modulator assembly must be replaced. Check your vehicle's service manual for repairability.
Is an ABS pump motor replacement expensive?
Yes. The ABS modulator assembly with pump can cost $400 to $900 for the part alone. Labor adds $100 to $300. Remanufactured units are available and can save significant money.