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C0110 Code Explained: Causes, Symptoms & ABS Pump Motor Circuit Malfunction Fixes

An ABS hydraulic control module with the pump motor highlighted alongside an OBD-II scanner displaying C0110 and illuminated ABS and traction control warning lights.

If your scan tool displays C0110, your vehicle’s Anti-lock Braking System (ABS) has detected a malfunction within the ABS pump motor circuit.

Unlike wheel speed sensor faults, the C0110 code indicates the Electronic Brake Control Module (EBCM) is unable to properly operate or monitor the hydraulic pump motor responsible for building brake pressure during ABS events.

The ABS pump motor is activated whenever the system detects impending wheel lockup. It rapidly restores hydraulic pressure while the ABS solenoids pulse the brake pressure to individual wheels, allowing you to maintain steering control during hard braking.

When the EBCM detects an electrical fault, excessive current draw, low voltage, or an internal pump failure, it stores C0110 and illuminates the ABS warning light. Depending on the vehicle, the Traction Control and Stability Control warning lights may also illuminate.

For additional chassis diagnostics and repair guides, visit our Complete OBD-II Trouble Code Guide:

https://my.prostreetonline.com/dtc-obdii

Quick Facts

ItemInformation
OBD-II CodeC0110
DescriptionABS Pump Motor Circuit Malfunction
CategoryChassis (C) Codes
SystemAnti-lock Braking System (ABS)
Severity★★★★★ Critical
Safe to Drive?Yes, but ABS, traction control, and stability control may be disabled
Common CausesFailed ABS pump motor, faulty EBCM, blown fuse, damaged wiring, low system voltage
Typical Repair Cost$150–2,000

What Does C0110 Mean?

The C0110 code indicates the Electronic Brake Control Module (EBCM) has detected an abnormal condition within the ABS hydraulic pump motor circuit.

The ABS pump motor plays a critical role during emergency braking by restoring brake pressure after the ABS solenoids momentarily release it. Without the pump motor, the ABS system cannot rapidly cycle brake pressure, reducing its ability to prevent wheel lockup.

Depending on the manufacturer, the fault may involve:

Unlike wheel speed sensor codes, C0110 generally points to the hydraulic control unit rather than a sensor.

Symptoms of C0110

Common symptoms include:

Normal braking usually remains available.

Common Causes

Failed ABS Pump Motor

The electric pump motor may fail internally due to:

This is one of the most common causes of C0110.

Faulty Electronic Brake Control Module (EBCM)

The EBCM controls pump motor operation.

Internal driver failures may prevent the pump from operating correctly.

Blown Fuse or Failed Relay

A failed ABS pump fuse or relay can interrupt power to the motor.

Always inspect these components before replacing the pump.

Low Battery Voltage

The ABS pump requires a stable power supply.

Weak batteries, poor alternator output, or voltage drops can trigger C0110.

Damaged Wiring Harness

Inspect for:

High current flowing through the pump motor makes connector damage relatively common.

Corroded Ground

Poor grounding can prevent the pump motor from operating correctly.

How Serious Is C0110?

Very serious.

Although the vehicle will generally stop normally, the following systems may become disabled:

Emergency braking performance may be significantly reduced on wet or slippery roads.

Can You Drive With C0110?

Yes—but use caution.

The hydraulic braking system continues to function normally, but without ABS:

Repairs should be completed as soon as possible.

How to Diagnose C0110

1. Scan the ABS Module

Use a professional scan tool capable of reading manufacturer-specific ABS data.

Record all stored and pending chassis codes.

2. Check Battery Voltage

Verify:

Low voltage can falsely trigger C0110.

3. Inspect ABS Fuses and Relays

Check:

4. Test Pump Motor Operation

Many scan tools allow an active test that commands the ABS pump motor on.

Listen for:

5. Inspect Wiring

Inspect the pump motor harness for:

6. Test the EBCM

If the pump motor, wiring, and power supply all test correctly, the EBCM may require further diagnosis or replacement.

Common Repairs

RepairEstimated Cost
Replace ABS fuse$20–50
Replace ABS relay$40–120
Repair wiring$100–300
Replace ABS pump motor$400–1,000
Replace hydraulic control unit$700–1,600
Replace EBCM$800–2,000

Common Diagnostic Mistakes

Common mistakes include:

Vehicles Commonly Affected

C0110 is frequently found on:

Although the exact repair procedures vary, ABS hydraulic pump failures are common across many manufacturers.

How to Prevent C0110

Reduce the likelihood of C0110 by:

Frequently Asked Questions

What causes C0110?

The most common causes include a failed ABS pump motor, faulty Electronic Brake Control Module, blown fuse, damaged wiring, low battery voltage, or poor electrical connections.

Is C0110 dangerous?

Yes.

Although conventional braking remains functional, ABS, traction control, and stability control may no longer operate correctly.

Can a weak battery cause C0110?

Yes.

Low system voltage is a surprisingly common cause of ABS pump motor faults.

Will C0110 clear itself?

No.

The underlying problem must be repaired before the ABS module clears the code.

Does C0110 affect engine performance?

No.

This code only affects chassis and braking systems.

Final Thoughts

The C0110 code indicates a malfunction within the ABS pump motor circuit, one of the most important components of the Anti-lock Braking System. While the vehicle usually remains drivable under normal conditions, the loss of ABS, traction control, and stability control can significantly reduce safety during emergency braking.

Most repairs involve diagnosing the pump motor, EBCM, wiring, relays, and power supply before replacing expensive components. Performing a systematic diagnosis can often save hundreds of dollars in unnecessary parts replacement.

For additional chassis diagnostics and repair guides, browse our complete Chassis (C) OBD-II Code Library:

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