P0088
Fuel Rail/System Pressure Too High
The ECU detects fuel rail pressure above the desired setpoint and cannot reduce it through pressure regulator commands. Risk of injector damage and rail seal failure if not addressed.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Pressure regulator stuck closedCommon
- Rail pressure sensor driftPossible
Parts involved
- Fuel Pressure Regulator
- High Pressure Fuel Pump
- Fuel Rail Pressure Sensor
P0088 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.