17433/P1025/004133
From Ross-Tech Wiki
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
Special Notes
- NAR (North American Region) VW Tech Tips 01-16-05 and 01-20-05 for vehicles with the 3.6L engine has information testing for possible timing chain issues.
- https://static.nhtsa.gov/odi/tsbs/2016/MC-10096053-0699.pdf NHTSA
- https://static.nhtsa.gov/odi/tsbs/2020/MC-10180093-0001.pdf NHTSA
- Check camshafts phase adjustments, if [8 degrees(+/-)] or more the engine is considered out of time.
- MVB group [208] and [209] with engine idling for non UDS ECMs
- IDE00182 and IDE00184 with engine idling for UDS ECMs
- Check camshafts phase adjustments, if [8 degrees(+/-)] or more the engine is considered out of time.
- 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.