Diagnostic Trouble Code
P2520
Fuel Pressure Fault — Volvo Application
What the code means
On some Volvo applications, P2520 can be presented as a fuel-pressure related fault.
This guide covers the fuel-pressure interpretation of P2520 encountered in the Speed Tweaks Volvo V50 diagnostic case.
Do not rely on the code number alone. P2520 is also used with other descriptions, so confirm the exact wording shown by your diagnostic equipment and the vehicle application before beginning diagnosis.
A fuel-pressure fault does not automatically identify a failed component. The fuel system needs to be tested to establish why the expected pressure or fuel delivery is not being achieved.
Possible causes
What could cause this P2520 fault?
Diagnostic approach
What should you check?
- 1. Confirm the exact fault description. Check that the diagnostic equipment is reporting the fuel-pressure interpretation of P2520 for this vehicle.
- 2. Read the complete fault memory. Look for related fuel-system or engine-management faults that may provide additional context.
- 3. Check the vehicle's service history. Previous maintenance and fuel-filter history can provide useful clues before components are condemned.
- 4. Inspect the fuel supply system. Check for restrictions, contamination and other obvious problems affecting fuel delivery.
- 5. Test the system before replacing components. Use the appropriate pressure, electrical and live-data checks for the vehicle to prove where the fault lies.
Speed Tweaks diagnostic video
Watch this P2520 diagnosis in the workshop
This Speed Tweaks video follows a real-world P2520 fault and shows the diagnostic process in practice.
Watch on YouTube →A useful thing to remember
The exact fault description and vehicle application matter. The same P2520 code number can appear with a different description on another vehicle.