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C0110 – What Does It Mean and How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.

Definition

C0110 is an OBD-II Code that refers to Pump Motor Circuit

Meaning

A C0110 code is a manufacturer specific diagnostic trouble code that relates to Chevrolet, GMC and related makes and vehicles that informs of when the pump motor that is an integral part of the Brake Pressure Modulator Valve (BPMV) has an issue and is also a vital part of the Electronic Brake Control Module (EBCM). 

It usually occurs when the pump motor relay is not activated during normal system operation. Activation of the pump motor relay and turning on the pump motor are required when the antilock brake system (ABS) or Traction Control System (TCS) is activated.

Causes

Common causes for this code include:

  • Malfunctioning Brake Pressure Modulator Valve (BPMV) 
  • Harness is open or shorted with the BPMV
  • The BPMV circuit has poor electrical connection

Symptoms

The symptoms of a C0110 code are:

  • Illuminated Check Engine Light
  • Illuminated Anti-Lock Brake System (ABS) Warning Light
  • The EBCM may disable the antilock brake system (ABS)/traction control system (TCS)/vehicle stability enhancement system (VSES)

Diagnosis

To diagnose a C0110 DTC code, a technician would:

  1. Scan for codes in the ECM and look at the freeze frame data for failure.
  2. Visually inspect all the wiring and connectors for the BPMV.
  3. Check for battery voltage on the BPMV power supply circuit.
  4. Check for ground on the BPMV ground circuit.
  5. With a test light, check for continuity of the BPMV pump motor relay control circuit from the ECM to the relay.
  6. With a multimeter, check for resistance in the pump motor winding and if it is within range, check for proper ohm value according to manufacturer’s specifications.
  7. If all these checks fail, then replace the BMPV valve. If they are all successful, clear the codes and perform a road test to verify that there are no more ABS/TCS/VSES failures.

Common mistakes

The following are some of the most common mistakes that a technician may make when diagnosing a C0110 code:

  • Not thoroughly inspecting all the wiring and connectors for damage.
  • Not checking the battery voltage on the BPMV power supply circuit.
  • Not checking the ground on the BPMV ground circuit.
  • Failing to check for continuity of the BPMV pump motor relay control circuit from the ECM to the relay.
  • Failing to check for resistance in the pump motor winding and if it is within range, not checking for proper ohm value according to manufacturer’s specifications.

How serious is this?

A C0110 code is a serious code that can result in the ABS/TCS/VSES system being disabled. This can lead to decreased braking ability and increased stopping distances, which can be extremely dangerous.

What repairs can fix the code?

The following are solutions that may fix this problem:

  • Repair or replace any wiring that is damaged
  • Check the battery voltage on the BPMV power supply circuit
  • Check the ground on the BPMV ground circuit
  • Repair or replace the BPMV valve
  • EBCM replacement, setup, and programming

Related codes

A C0110 is related to and may be accompanied by the following codes:

B0110 – EBCM System Relay Circuit

C0035 – EBCM System Relay Circuit

C0040 – EBCM System Relay Circuit

Other Manufacturer Specific Codes

Conclusion

In conclusion, the C0110 code is a diagnostic trouble code that refers to a problem with the pump motor in the brake pressure modulator valve. This code is associated with Chevrolet, GMC, and other related makes and models. The most common cause of this code is a malfunctioning brake pressure modulator valve, but it can also be caused by a number of other factors. Symptoms of this code include an illuminated check engine light and ABS warning light, as well as the potential for the EBCM to disable the ABS/TCS/VSES system. If you have this code, it is important to get it diagnosed and repaired as soon as possible to avoid any potential safety issues.