WOMS
P code powertrain Medium severity

P1681 Metering Oil Pump Malfunction

The OBD2 code P1681 indicates a malfunction in the metering oil pump, which is responsible for regulating the flow of oil to the engine

Definition

The OBD2 code P1681 indicates a malfunction in the metering oil pump, which is responsible for regulating the flow of oil to the engine

Common causes

  • Faulty metering oil pump
  • Electrical connection issues
  • Wiring harness damage
  • Low oil level
  • Oil contamination
  • Faulty engine control module (ECM)
  • Sensor malfunctions
  • Blocked oil passages

Common misdiagnoses

  • Faulty oil pressure sensor
  • Engine oil level issues
  • Oil pump failure
  • Wiring or connector issues
  • Engine control module (ECM) problems
  • Faulty fuel pump
  • Incorrect oil viscosity
  • Oil filter blockage

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

    Examine the wiring and connectors related to the metering oil pump. Look for signs of damage, corrosion, or loose connections that could affect the pump's operation

  3. 3. Test the Metering Oil Pump

    If accessible, test the metering oil pump for proper operation. This may involve checking the resistance of the pump's electrical components or using a multimeter to ensure it is receiving the correct voltage

  4. 4. Check Oil Levels and Quality

    Ensure that the engine oil is at the correct level and is in good condition. Low oil levels or contaminated oil can affect the performance of the oil metering system

  5. 5. Inspect the Oil Filter

    A clogged or dirty oil filter can restrict oil flow, leading to issues with the metering oil pump. Replace the oil filter if necessary

  6. 6. Examine the Oil Supply Lines

    Check for any blockages or leaks in the oil supply lines that could affect the flow of oil to the metering pump

  7. 7. Look for Mechanical Issues

    Inspect the engine for any mechanical issues that could affect oil flow, such as a failing oil pump or internal engine wear

  8. 8. Reset the Code

    After performing any repairs or adjustments, clear the trouble code using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  9. 9. Seek Professional Help

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with the specific vehicle make and model. By following these troubleshooting steps, you can identify and potentially resolve the issue associated with the P1681 code