WOMS
P code powertrain Medium severity

P1680 Metering Oil Pump Malfunction

The OBD2 code P1680 indicates a malfunction in the metering oil pump, which is responsible for regulating the flow of oil to the engine components

Definition

The OBD2 code P1680 indicates a malfunction in the metering oil pump, which is responsible for regulating the flow of oil to the engine components

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 control module (ECM) issues
  • Wiring or connector problems
  • Oil pump failure
  • Low oil level or oil quality issues
  • Faulty fuel pump or fuel system issues
  • Ignition system problems
  • Sensor calibration errors

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 associated with 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 pump's electrical connections and ensuring it is receiving the correct voltage and ground

  4. 4. Check the Oil Level and Quality

    Ensure that the engine oil level is adequate and that the oil is in good condition. Contaminated or low oil can affect the performance of the metering oil pump

  5. 5. Inspect the Oil Pump Control Module

    If the vehicle is equipped with an oil pump control module, check its functionality. This may involve testing the module for proper operation and ensuring it is receiving the correct signals

  6. 6. Examine the Fuel System

    Since the metering oil pump is often part of the fuel system, inspect the fuel lines, filters, and injectors for any blockages or leaks that could affect performance

  7. 7. Check for Mechanical Issues

    Inspect the engine for any mechanical issues that could affect the metering oil pump's operation, such as a malfunctioning timing belt or chain

  8. 8. Clear the Code and Test Drive

    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 reappears

  9. 9. Seek Professional Help

    If the issue persists after performing the above steps, consider seeking assistance from a qualified mechanic or technician who has experience with diesel engines and OBD-II diagnostics. By following these troubleshooting steps, you can systematically identify and resolve the underlying issues causing the P1680 code