WOMS
P code powertrain Medium severity

P260D Coolant Pump 'A' Control Circuit Low

The OBD2 code P260D indicates a low voltage or malfunction in the control circuit of the coolant pump 'A', which is responsible for circulating coolant in the engine or hybrid system

Definition

The OBD2 code P260D indicates a low voltage or malfunction in the control circuit of the coolant pump 'A', which is responsible for circulating coolant in the engine or hybrid system

Common causes

  • Faulty coolant pump
  • Damaged wiring or connectors
  • Short circuit in the control circuit
  • Open circuit in the control circuit
  • Faulty engine control module (ECM)
  • Poor ground connection
  • Blown fuse related to the coolant pump circuit

Common misdiagnoses

  • Faulty coolant pump
  • Wiring issues or shorts in the circuit
  • Bad coolant temperature sensor
  • Engine control module (ECM) failure
  • Low coolant level
  • Thermostat malfunction
  • Faulty relay or fuse related to the coolant pump
  • Incorrectly diagnosed overheating issues

Troubleshooting steps

  1. 1. 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 multiple issues

  2. 2. Inspect the Coolant Pump

    Visual Inspection: Check the coolant pump for any visible damage, leaks, or corrosion

  3. 3. Functionality

    If possible, test the coolant pump to ensure it is functioning correctly. You may need to apply power directly to the pump to see if it operates

  4. 4. Examine the Wiring and Connectors

    Wiring Inspection: Look for damaged, frayed, or corroded wires in the coolant pump circuit. Pay special attention to areas where the wiring may be exposed to heat or moisture

  5. 5. Connector Check

    Ensure that all connectors are secure and free of corrosion. Clean any corroded connectors and ensure a tight fit

  6. 6. Test the Coolant Pump Relay

    If the coolant pump is controlled by a relay, test the relay for proper operation. You can swap it with a similar relay in the fuse box to see if the problem persists

  7. 7. Check the Power and Ground

    Use a multimeter to check for proper voltage at the coolant pump connector. Ensure that the pump is receiving the correct voltage when commanded to operate

  8. 8. Check the ground connection for the coolant pump. A poor ground can cause low voltage readings

  9. 9. Inspect the Engine Control Module (ECM)

    If all other components check out, the issue may lie with the ECM. Ensure that the ECM is functioning properly and that it is sending the correct signals to the coolant pump

  10. 10. Look for Short Circuits

    Inspect the circuit for any short circuits that may be causing the low voltage condition. This can include checking for pinched wires or shorts to ground

  11. 11. Check for Software Updates

    In some cases, a software update for the ECM may resolve the issue. Check with the manufacturer for any available updates

  12. 12. Clear Codes and Test Drive

    After performing repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns

  13. 13. Consult a Professional

    If you are unable to diagnose or fix the issue, it may be best to consult a professional mechanic who has experience with your specific vehicle make and model. By following these steps, you should be able to identify and resolve the issue related to the P260D code. Always refer to the vehicle's service manual for specific diagnostic procedures and specifications