C0110 – Pump Motor Circuit Malfunction

The ODBII code C0110 indicates a malfunction in the pump motor circuit, typically related to the anti-lock braking system (ABS) or traction control system, suggesting an issue with the pump motor’s operation or electrical connections.

The severity of ODBII code C0110 is generally considered moderate to severe.

Common Causes For: C0095 Right Rear ABS Solenoid #2 Circuit Malfunction

• Faulty pump motor
• Damaged wiring or connectors
• Blown fuse
• Failed relay
• Short circuit in the circuit
• Open circuit in the circuit
• Corroded terminals
• Faulty control module

Common misdiagnosis for C0110 Pump Motor Circuit Malfunction

• ABS Module Failure
• Wheel Speed Sensor Issues
• Brake Fluid Level Sensor Malfunction
• Wiring Harness Problems
• Relay or Fuse Issues
• Brake Booster Problems
• Power Supply Issues
• Grounding Problems
• Pump Motor Failure
• Control Module Software Issues

Common Troubleshooting Steps

The OBD-II code C0110 refers to a “Pump Motor Circuit Malfunction,” which typically indicates an issue with the pump motor circuit in the vehicle’s anti-lock braking system (ABS) or traction control system. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check for Additional Codes: Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues present.
• Inspect the Wiring and Connectors: Visually inspect the wiring and connectors associated with the pump motor circuit. Look for signs of damage, corrosion, or loose connections.
• Pay special attention to the wiring harness that connects to the pump motor and the ABS module.
• Test the Pump Motor: If accessible, test the pump motor directly. You can do this by applying power to the motor to see if it operates. If it does not run, the motor may be faulty and require replacement.
• Check the Relay and Fuses: Inspect the relay and fuses associated with the pump motor circuit. A blown fuse or a faulty relay can prevent the pump motor from receiving power.
• Replace any blown fuses and test the relay for proper operation.
• Measure Voltage and Ground: Use a multimeter to check for voltage at the pump motor connector while the vehicle is in the appropriate mode (e.g., ignition on, engine running).
• Ensure that the pump motor is receiving the correct voltage and that there is a good ground connection.
• Test the ABS Module: If the pump motor and circuit appear to be functioning correctly, the issue may lie within the ABS module itself. Testing or replacing the ABS module may be necessary if other components are functioning properly.
• Check for Fluid Leaks: Inspect the brake fluid reservoir and the hydraulic lines for any leaks that could affect the operation of the ABS system.
• Clear Codes and Test Drive: After performing repairs or replacements, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns.
• Consult Service Manual: Refer to the vehicle’s service manual for specific diagnostic procedures and specifications related to the pump motor circuit for your particular make and model.
• Seek Professional Help: If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with ABS systems and can perform more advanced diagnostics. By following these steps, you should be able to identify and resolve the issue related to the C0110 code.