P0087: Kraftstoffrail-/Systemdruck — zu niedrig
Kraftstoffrail-/Systemdruck — zu niedrig: High-pressure direct-injection (GDI/Common Rail) fuel rail pressure is significantly below commanded target.
| Trouble Code (DTC) | P0087 |
|---|---|
| Official SAE Definition | Kraftstoffrail-/Systemdruck — zu niedrig |
| Vehicle Subsystem | powertrain |
| Driving Severity | HIGH |
Observable Symptoms
- Loss of power under acceleration
- Engine cuts out or enters limp mode under load
- Extended cranking
Most Probable Root Causes
- Weak low-pressure in-tank lift pump or clogged fuel filter
- Failing High-Pressure Fuel Pump (HPFP) or worn cam follower
- Leaking fuel rail pressure relief valve
Step-by-Step Diagnostic Procedure
- Compare commanded vs actual high-pressure rail MPa/bar and low-pressure supply line pressure
- Inspect HPFP cam lobe and pressure regulator solenoid