ABS Pump Motor Circuit Malfunction
The C0110 code means the vehicle's onboard diagnostic system has detected: ABS Pump Motor Circuit Malfunction. This is a critical severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $1200 (parts and labor)
Basic scanners cannot read ABS codes. BlueDriver reads all systems including ABS, SRS, and transmission through your phone.
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Basic scanners cannot read ABS codes. This one reads all four systems so you know exactly which sensor failed.
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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
-
Scan for DTCs and check for related pump motor codes
-
Listen for the ABS pump motor running -- continuous operation indicates a fault
-
Test the ABS pump motor relay by swapping with a similar relay
-
Check voltage and ground at the pump motor connector with ignition on
-
Inspect wiring between the relay box and ABS module for damage
Common Fixes by Vehicle
What techs usually find when diagnosing C0110 on specific vehicles — tap your vehicle for the fix and the exact part:
2003-2014 Chevrolet Silverado/GMC Sierra hard DIY
C0110 (pump motor circuit malfunction) on GM trucks is similar to C0020 -- the ABS pump motor or its driver circuit is failing. Check the 60A ABS fuse in the underhood box first (free fix if blown). Next, listen for the pump motor running at key-on. If it is silent, the motor is likely dead or the relay inside the EBCM has failed. Remanufactured EBCMs ship programmed to your VIN from most rebuilders.
Labor: 2-3 hours2002-2009 Chevrolet Trailblazer/GMC Envoy hard DIY
Envoy/Trailblazer C0110 is typically the EBCM solder joint issue affecting the pump motor circuit. DIY solder repair is a well-documented fix (search forum threads for "Envoy EBCM rebuild"). If you do not want to solder, a remanufactured EBCM with lifetime warranty costs ~$250 online. Bleeding the ABS after install requires a scan tool with bidirectional control.
Labor: 2-3 hours2006-2012 Chevrolet Impala/Monte Carlo hard DIY
Impala C0110 sometimes clears by cleaning the EBCM ground connection. The EBCM grounds through its mounting bolts to the frame rail -- corrosion here can cause voltage drops that log C0110. Remove the EBCM, wire-wheel the mounting bolt holes, apply anti-seize, reinstall. If the code persists, the EBCM pump driver is failing and needs replacement.
Labor: 2-3 hoursFrequently 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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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