OBD-II Code · Chassis
C0110
Pump Motor Circuit Malfunction (ABS)
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Only if running normally
A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety.
Indicative cost (USD)
$400–$1,500
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
ABS pump motor circuit fault.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- ABS light
- Brake pedal feel changed
- Reduced ABS function
Likely causes
- Failed pump motorMost common
- Wiring
- ABS module driver
Read the full diagnostic procedureC0110 indicates an ABS pump motor circuit malfunction — the EBCM is commanding the hydraulic pump motor to run (during self-test or active ABS event)…
C0110 indicates an ABS pump motor circuit malfunction — the EBCM is commanding the hydraulic pump motor to run (during self-test or active ABS event) and either not seeing the expected current draw, seeing a stuck-on condition, or detecting a control-circuit fault. This is one of the few ABS codes where the cheapest-first ladder is short, because the pump motor itself is usually integral to the EBCM/hydraulic control unit (HCU) assembly.
Start with the free checks
clear the code, cycle the key three times and listen for the pump self-test (a 1-2 second whirr on most GM/Ford applications); silence usually means the motor or its relay is dead. Check the ABS pump motor fuse and the dedicated battery-feed circuit — pump motors pull 30-50 amps in operation and run on a thick fusible link straight from the battery; corrosion at the underhood fuse block is a $0 fix that masquerades as a $1,200 EBCM. Measure battery voltage at the pump motor connector with the relay commanded on via scan tool: anything under 11.5V under load points to a wiring/ground issue, while full battery voltage with no motor rotation means the motor armature is open or seized. The expensive misdiagnosis: replacing the entire EBCM/HCU at $900-$1,500 when the actual fault was a corroded pump-motor ground stud at the inner fender, an $8 repair.
Vehicle-specific patterns1999-2007 GM full-size trucks (Silverado, Sierra, Tahoe, Suburban, Yukon) with Kelsey-Hayes 325 EBCM — pump motor brushes wear and the solder joints…
- 1999-2007GM full-size trucks (Silverado, Sierra, Tahoe, Suburban, Yukon) with Kelsey-Hayes 325 EBCM — pump motor brushes wear and the solder joints inside the EBCM crack, classic C0110 plus C0265 combo; Module Masters and several remanufacturers offer a $150-$250 rebuild service vs $900+ for new.
- 2005-2010Pontiac G6/Chevy Malibu — pump motor ground at the radiator support corrodes.
- 2003-2008Dodge Ram 1500/2500 — pump motor connector backshell cracks, water enters.
- 2000-2005Ford Excursion/F-250 Super Duty — pump motor relay in the underhood fuse box welds contacts.
Estimated repair$8 to $1,500.
Look up another code
C0110 — frequently asked
What does a C0110 code mean?
ABS pump motor circuit fault.
What causes a C0110 code?
Common causes: Failed pump motor; Wiring; ABS module driver.
What are the symptoms of a C0110 code?
Typical symptoms: ABS light; Brake pedal feel changed; Reduced ABS function.
Is it safe to drive with a C0110 code?
Only if running normally. A short trip to a shop may be reasonable if the light is steady and the car runs normally. Stop safely for a flashing light, severe shaking, overheating, loss of power, or another urgent warning. The code alone cannot confirm safety. Estimated repair: $400-$1,500.
How do I diagnose a C0110 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
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