C0110 Pump Motor Circuit Malfunction: Quick Fix Guide for Vehicle Owners

Encountering a C0110 Pump Motor Circuit Malfunction in your vehicle can be a daunting experience.

This article delves into the intricacies of this specific diagnostic trouble code, exploring its causes, symptoms, and effective troubleshooting methods.

Whether you’re a seasoned mechanic or a concerned car owner, this guide aims to provide a comprehensive understanding of the C0110 code, ensuring you’re well-equipped to address this issue and maintain your vehicle’s optimal performance.

C0110 Pump Motor Circuit Malfunction: Quick Fix Guide for Vehicle Owners

Understanding C0110 Pump Motor Circuit Malfunction

C0110 is a diagnostic trouble code (DTC) related to a vehicle’s pump motor circuit. When this code appears, it indicates that there’s an issue with the pump motor’s system.

This system is responsible for generating necessary pressure or motion for optimal operation. If there’s a malfunction in the circuit, it can negatively affect the associated systems1.

I should mention that I may encounter several symptoms when this code is triggered.

For instance, I might notice my vehicle’s ABS or traction control system behaving erratically2.

Moreover, in order to diagnose a C0110 code, some actions need to be taken. Here’s what a technician would do:

  • Scan the ECM for codes and review freeze frame data.
  • Visually inspect wiring and connectors for the BPMV.
  • Check for battery voltage on the BPMV power supply circuit.
  • Ensure proper grounding for the BPMV ground circuit3.

There can be multiple causes for the C0110 code to come up. Some possibilities include a faulty Electronic Brake Control Module (EBCM) with Brake Pressure Modulator Valve (BPMV) or an open/shorted EBCM harness4.

By following the diagnostic steps and addressing the root cause, I can fix the problem and restore my vehicle’s performance.

Causes of C0110

I’ve been researching the C0110 pump motor circuit malfunction, and I found some common causes that might trigger this issue. Let me share them with you in a concise manner.

The primary cause seems to be a faulty Electronic Brake Control Module (EBCM) with Brake Pressure Modulator Valve (BPMV), which can create issues with the pump motor circuit1.

Another possible reason is that the EBCM harness might be open or shorted, causing the error2.

Additionally, there might be some problems with the wiring from the pump motor connector to the motor3.

If these wires get damaged, it can lead to the C0110 error. Next, the pump motor connector itself might have a corroded or bad terminal, and this would affect the circuit3.

The error could also be a result of damaged pins in the EBCM, leading to inadequate connections3. And finally, deficiencies in the Anti-Lock Brake System (ABS) wires could be another contributing factor3.

Symptoms of C0110

I’ve noticed that there are a few common symptoms associated with the C0110 pump motor circuit malfunction. These symptoms can help in identifying and diagnosing the issue.

One of the most apparent signs is the illuminated check engine light. This light typically comes on when there is a problem in the vehicle’s engine management system. Seeing this warning signal encourages me to look into the issue right away.

Another indicator is the ABS warning light staying on. The anti-lock braking system (ABS) plays a vital role in maintaining vehicle control during sudden braking.

When this light is on, I know that the ABS might not work as expected, increasing the risk of skidding or losing control.

Additionally, I’ve observed reduced braking ability in vehicles experiencing a C0110 malfunction. This reduced braking power can lead to longer stopping distances and decreased overall safety.

In some cases, the ABS, traction control, and/or stability control systems may be disabled, affecting the overall driving experience and safety.

By paying attention to these symptoms, I can quickly identify the presence of a C0110 pump motor circuit malfunction and take appropriate steps to resolve the issue.

Diagnosing C0110

I noticed that when the Electronic Brake Control Module (EBCM) detects a low voltage in the pump motor supply circuit, the Diagnostic Trouble Code (DTC) C0110 is set.

This happens if the feedback voltage is less than 4.5 V for more than 150 ms and the pump motor is not activated1.

When I diagnose this issue, I follow these steps:

  1. First, I consult the Technical Service Bulletins (TSBs) for any relevant information5. This is useful for identifying any known issues related to C0110 and can help me save time during the diagnostic process.

  2. Next, I thoroughly inspect the wiring and connectors related to the pump motor, the Anti-Lock Brake System (ABS), and the Electronic Brake Control Module5. Damaged or corroded connectors can lead to a malfunction in the pump motor circuit.

For better understanding, the main components involved in diagnosing C0110 are:

  • Electronic Brake Control Module (EBCM)
  • Pump motor
  • Wiring and connectors related to the ABS

In some cases, a temporary fix can be done by addressing the ABS and stability control code4. However, a long-term solution may require more in-depth analysis and repair. A comparison table can be found below:

ComponentPossible IssueSolution
EBCMLow voltageCheck wiring and connections
Pump motorNot activatedInspect motor and related components
ABS wiringDamaged or corrodedReplace or repair as necessary

Remember, diagnosing C0110 errors involves a step-by-step process. Always refer to the vehicle’s service manual for specific diagnostic procedures and safety precautions.

Repair and Replacement Options

DIY Repair Options

I’ve found that there are a few possible causes of the C0110 pump motor circuit malfunction, such as a faulty ABS pump motor, damaged wiring harness, or bad connections at the ABS module or pump motor 1.

If I’m comfortable working on my own vehicle, some DIY repair options might include:

  • Checking for damaged wiring and connectors around the ABS pump motor
  • Inspecting the fuses and relays related to the ABS pump motor
  • Replacing the ABS pump motor if it’s determined to be faulty

Replacing the ABS Pump Motor

When dealing with a C0110 Pump Motor Circuit Malfunction, one of the critical steps you might need to consider is replacing the ABS (Anti-lock Braking System) Pump Motor.

This component is crucial for the proper functioning of your vehicle’s braking system. Here’s a detailed guide on how to replace the ABS Pump Motor:

Step-by-Step Guide to Replacing the ABS Pump Motor

  1. Preparation and Safety:
    • Ensure the vehicle is parked on a flat surface and the engine is turned off.
    • Engage the parking brake and disconnect the battery to prevent any electrical shocks or short circuits.
    • Gather all necessary tools, including wrenches, screwdrivers, and a new ABS pump motor.
  2. Locating the ABS Pump Motor:
    • The ABS Pump Motor is typically located in the engine compartment.
    • Refer to your vehicle’s manual to find the exact location and any specific instructions related to your car model.
  3. Removing the Old ABS Pump Motor:
    • Carefully remove any components that obstruct access to the ABS pump motor.
    • Disconnect the electrical connectors and brake lines connected to the pump. Be prepared for brake fluid spillage and have a container ready to catch the fluid.
    • Unscrew and remove the mounting bolts that secure the ABS pump motor in place.
  4. Installing the New ABS Pump Motor:
    • Position the new ABS pump motor in place and secure it with the mounting bolts.
    • Reconnect the brake lines and electrical connectors to the new pump. Ensure all connections are tight and secure.
    • Bleed the brake system to remove any air that may have entered during the replacement process. This step is crucial for the proper functioning of the brakes.
  5. Final Checks and Testing:
    • Once everything is reassembled, reconnect the battery.
    • Start the engine and check for any warning lights on the dashboard.
    • Test the brakes in a safe area to ensure they are functioning correctly. Listen for any unusual noises and ensure the brake pedal feels firm.
  6. Professional Assistance:
    • If you are not confident in performing this replacement yourself, it is highly recommended to seek professional assistance. A certified mechanic will have the expertise and tools to ensure the job is done safely and correctly.

Tips and Considerations:

  • Compatibility: Ensure the replacement ABS pump motor is compatible with your vehicle model.
  • Brake Fluid: Use the correct type of brake fluid as specified in your vehicle’s manual.
  • Warranty: Check if your vehicle is still under warranty, as some repairs might be covered.
  • Recalls: Stay informed about any manufacturer recalls that might apply to your vehicle’s braking system.

Professional Repair Services

If I’m not confident in my ability to perform the DIY repairs, or if the issue persists after attempting the DIY options, it’s best to seek professional repair services.

They will have the necessary tools and expertise to diagnose and fix the issue accurately. Typically, a professional technician would:

  • Scan for codes in the ECM and review freeze frame data for failure 2
  • Perform a visual inspection of all the wiring and connectors for the BPMV
  • Check for battery voltage on the BPMV power supply circuit
  • Check for ground on the BPMV ground circuit

One of the key aspects to avoid experiencing a C0110 pump motor circuit malfunction is to regularly inspect and maintain your vehicle’s braking system.

Prevention Tips

This includes checking the Electronic Brake Control Module (EBCM) and Brake Pressure Modulator Valve (BPMV) since a faulty EBCM can cause the C0110 code to appear.

As a car owner, I also pay attention to any abnormal signs in my car’s performance. For instance, if my ABS or traction control lights come on, I take it as a cue to inspect these components.

Staying alert to such indicators helps in identifying issues early on and preventing more severe problems.

To further ensure my vehicle’s braking system’s proper functioning, I follow manufacturer-recommended maintenance schedules.

This involves flushing and replacing the brake fluid, checking brake pads, and occasionally inspecting the brake lines for any corrosion or leaks. Maintaining these components reduces the likelihood of triggering the C0110 code.

Additionally, I keep myself updated on possible recalls concerning my car model. In certain cases, manufacturers acknowledge some issues and provide guidelines or remedies to address these problems.

Staying informed about such actions can keep me ahead of potential malfunctions.

Remember, prevention is better than dealing with unexpected car issues. By prioritizing regular maintenance, inspection, and vigilance, I effectively reduce the chances of experiencing a C0110 pump motor circuit malfunction in my vehicle.

Frequently Asked Questions

What can cause a C0110 pump motor circuit malfunction?

A C0110 pump motor circuit malfunction can be caused by several factors, including a faulty Electronic Brake Control Module (EBCM) with Brake Pressure Modulator Valve (BPMV), or an open or shorted EBCM harness1. Other possible causes may include low voltage in the pump motor supply circuit or a binding or stalled pump motor.

How do you troubleshoot and fix a C0110 code?

To troubleshoot and fix a C0110 code, you should begin by inspecting all wiring and connectors for damage2. Check the battery voltage on the BPMV power supply circuit and examine the ground on the BPMV ground circuit. Also, look for any internal system relay issues in the EBCM and test the pump motor feedback voltage after activation.

What is the potential impact of a C0110 code on vehicle performance?

The potential impact of a C0110 code on vehicle performance may include reduced brake fluid pressure, causing a decrease in braking efficiency. Additionally, the vehicle’s Anti-lock Braking System (ABS) may be compromised, which could lead to longer stopping distances and potential collisions.

Are there any common fixes for a C0110 code in a GMC or Chevy Silverado?

In a GMC or Chevy Silverado, common fixes for a C0110 code may include3: replacing the Electronic Brake Control Module, repairing any damaged wiring or connectors, and checking the vehicle’s battery voltage to ensure proper voltage is being supplied to the circuit.

How can I identify if the pump motor circuit is stuck or open?

To identify if the pump motor circuit is stuck or open, monitor the pump motor feedback voltage1. If the voltage remains low during activation (below 4.5 V for greater than 150 ms), it may indicate that the circuit is stuck or open.

Is it safe to drive with the C0110 code triggered in a Chevy Colorado or Vauxhall?

Driving with the C0110 code triggered in a Chevy Colorado or Vauxhall can be dangerous, as it may compromise the braking system by reducing brake fluid pressure and impairing the Anti-lock Braking System (ABS). It is recommended to get the issue resolved as soon as possible to ensure safety.


Navigating the complexities of a C0110 Pump Motor Circuit Malfunction can be challenging, but with the right knowledge and approach, it’s manageable.

This article has provided a thorough exploration of the causes, symptoms, and solutions for this specific diagnostic trouble code.

By understanding the intricacies of the C0110 code and following the outlined troubleshooting steps, vehicle owners can effectively address this issue, ensuring their vehicle’s braking system remains reliable and efficient.


  1. DTC Explainer 2 3 4 5 6

  2. Code C0110 Pump Motor Circuit – AutoCodes 2 3 4

  3. OBD2PROS 2 3 4 5 6

  4. Engine-Codes.com 2

  5. https://fixtroublecodes.com/c0110/ 2