The C0110: ABS Pump Motor Circuit Malfunction OBD2 code specifically relates to a malfunction within the ABS pump motor circuit.
This pump motor is crucial for maintaining control and stability during braking by preventing the wheels from locking up. Issues identified by this code can lead to compromised braking performance, highlighting the importance of timely diagnostics and repair.
C0110 quick overview
Meaning | C0110: ABS Pump Motor Circuit Malfunction |
Is it serious? | Yes, it directly impacts the vehicle’s braking system and overall safety. |
Possible causes | – Faulty ABS pump motor – Poor electrical connections to the pump motor – Faults within the Electronic Brake Control Module (EBCM) – Damaged wiring in the pump motor circuit |
How to diagnose? | Inspect electrical connections to the ABS pump motor for corrosion or looseness. Check the ABS pump motor’s wiring for damage or breaks. Test the ABS pump motor for proper function. Consider the EBCM for faults or the need for reprogramming. Verify ground connections, particularly engine to frame grounding points. |
C0110 Meaning
Imagine your car’s ABS system as a safety net that keeps your brakes from locking up during an emergency stop. The C0110 code signals a problem in the electrical circuit that powers the pump keeping this safety net ready.
This could be due to anything from a faulty pump, a loose wire, or even an issue with the brain of the ABS system. Addressing this code is crucial because it ensures that your vehicle’s ABS system is ready to spring into action, preventing skidding and maintaining control when you need it most.
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How to fix C0110 – learn from mechanics
I looked into C0110 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.
Case #1: GMC C0110
Vehicle information 2004 GMC Envoy SLE 4.2L ABS module
Issue + repair history
- Code CO110 present.
- Checked both connectors at the EBCM (Electronic Brake Control Module) and cleaned and tightened the ground on the frame.
- Cleared the code, but it reappeared after driving 10 feet.
- Fuses confirmed good, and the red wire has 12 volts at the EBCM.
- Suspected issue with the module mounted on top of the ABS unit.
Other OBD2 Codes + Test Results
- No other OBD2 codes mentioned.
- Test results indicate 12 volts at the EBCM’s red wire.
Mechanic suggestions
- Suggested checking out Module Master and ABS Fixer websites for repair options.
- Recommended Module Master in Moscow, Idaho, for repair without reprogramming.
- Advised checking the ground from the engine to the frame.
- Suggested replacing the module and performing a tire size calibration procedure with a scan tool.
Final fix Replaced the ABS module with a used unit obtained from a salvage yard, as the original module could not be repaired. Upon installation, the ABS light remained illuminated, leading to the discovery of a shorted motor. Replaced the used unit and bled the system, resolving the issue.
Case #2: Pontiac C0110
Vehicle information 2006 Pontiac Grand Prix GT 3.8L
Issue + repair history
- Message “SERVICE VARIABLE EFFORT STEERING” displayed on the DIC (Driver Information Center) upon ignition.
- OBD2 trouble codes retrieved: C0110 (Pump Motor Circuit), C0040 (RF Wheel Speed Sensor Circuit), C0450 (Steering Assist Control Circuit), U1000 (Class 2 Datalink Fault).
- Confusion due to illuminated steering light despite the vehicle not being equipped with variable assist steering.
- Initial focus on the C0450 code, but vehicle does not have variable assist steering.
- Questions whether to focus on the ABS problem and concerns about the EBTCM (Electronic Brake and Traction Control Module).
Other OBD2 Codes + Test Results
- OBD2 codes: C0110, C0040, C0450, U1000.
- No specific test results mentioned.
Mechanic suggestions
- Suggested checking the PCM (Powertrain Control Module) for compatibility and correct installation.
- Advised double-checking fuses, even seemingly unrelated ones, as missing fuses could cause issues.
- Recommended checking the RPO sticker for variable steering option and inspecting the rack for replacement.
- Suggested focusing on the speed sensor code first, as it might be causing the other codes.
- Recommended checking the steering wheel sensor near the brake pedal.
- Suggested inspecting wires to the pinion area and terminals 29 and 30 at EBTCM for possible damage or incorrect programming.
Final fix Swapped EBTCM with a unit from a compatible vehicle, which resolved the issue, indicating a defective EBTCM or incorrect module installation from a previous replacement.
Case #3: Chevrolet C0110
Vehicle information 2004 Chevrolet Express 2500 4.8L
Issue + repair history
- Complaint of ABS lamp on and intermittent instrument cluster operation.
- History codes: C0035, C0040. No current codes.
- Unable to communicate with other modules or clear codes when ABS module is plugged in.
- Checked power wires, ground, resistance of pump motor, and front speed sensors.
- Installed used and new ABS modules, but issues persisted with different codes.
- Finally traced the problem to a bad ground on the braided grounding strap from the RF of the engine to the frame.
Other OBD2 Codes + Test Results
- Initial codes: C0035, C0040.
- After module replacements: C0055, C0201, C0110.
Mechanic suggestions
- Raised concerns about the programming of the new module and potential sensitivity to used modules.
- Advised to check for a bad ground and recommended inspecting the driver’s side frame rail for the ground connection.
- Suggested performing a voltage drop test on powers and grounds with the ABS module harness connected.
Final fix
- Identified a bad ground on the braided grounding strap from the RF of the engine to the frame.
- Installed a new ground wire, resolving all issues.
- Planning to install a new ground strap once available.
How to diagnose C0110
I made you an overview of solving this DTC, based on all the advice that was suggested by certified mechanics to address this issue in previously mentioned service cases.
Diagnostic Step | Explanation |
---|---|
Inspect electrical connections to the ABS pump motor | Ensure they are secure and free from corrosion, which could disrupt power supply. |
Check the pump motor’s wiring | Look for any signs of damage or wear that might impede electrical flow. |
Test the ABS pump motor | Use diagnostic equipment to verify the pump’s operational integrity. |
Evaluate the EBCM | Assess for any programming issues or faults that might be causing the C0110 code. |
Verify ground connections | Check grounding points, especially from the engine to the frame, as poor grounding can lead to various electrical issues. |
By following these steps, based on real service cases, you can effectively troubleshoot and resolve issues related to the C0110 code. Given the complexity of modern ABS systems and the critical safety functions they perform, seeking professional assistance is often advisable to ensure accurate diagnosis and repair.
Car Diagnostics Training
- Car Electrical basics
- OBD-II scanner basics
- How to use an OBD reader
- Introduction to a Bi-directional Scan tool
- OBD scanner buyer’s guide + discounts
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko