P0087 — Fuel Rail/System Pressure Too Low
The ECU detects fuel rail pressure below the desired setpoint despite maximum pump and metering valve commands. Common in direct injection diesel and gasoline systems where high-pressure pump or rail pressure regulator fails.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- High pressure fuel pump
- Fuel pressure regulator
- Fuel rail
- Fuel filter
- Fuel injector
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- High-pressure fuel pump worn
- Pressure regulator stuck open
- Fuel filter clogged
- Injector leaking back
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
- Reduced-power or limp mode may occur
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.