P0088 Fuel Rail/System Pressure - Too High
Rail fuel pressure is above the expected value.
Common causes
- Faulty pressure regulator or control valve
- Faulty rail pressure sensor
- Return line restriction
Symptoms
- Check engine light
- Rough running
- Limp mode
What to check
- Compare sensor reading with a mechanical gauge where possible
- Check regulator wiring
- Inspect return line
Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P0088, follow the service information for that make and model.