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P1025 - Fuel Pressure Regulation Valve (N276): Mechanical Failure

Possible Symptoms

  • Malfunction Indicator Light (MIL) ON
  • High pitched whining noise from engine when idling.
  • ECM may also have stored in memory, P0088 - Fuel Rail/System Pressure: Too High.

Possible Causes

  • Faulty High Pressure Fuel Pump
  • Engine camshaft(s) out of time

Possible Solutions

  • Replace faulty High Pressure Fuel Pump
  • Correct camshaft timing issues
  • When found in 2006 to 2009 Volkswagen Passat, Passat CC and Touareg with 3.6L gasoline engines:
    • Check MVB group [208] and [209] with engine idling, if [8 degrees(+/-)] or more the engine is considered out of time.
    • NAR (North American Region) users can see VW Tech Tip [01-16-05] for exact repair details.
    • RoW (Rest of World) users may find TPI 2040216/1 helpful.
  • When found in gas models with a remote battery such as the Q7, P0088 may be stored due to voltage drop issues. TSB 2025746 applies to the NAR market.

Special Notes

  • NAR (North American Region) VW Tech Tip 01-20-05 for 2006 to 2021 vehicles with the 3.6L engine has information on timing issues due to timing chain issues.