P008B
Low Pressure Fuel System Pressure - Too High
The low-pressure fuel pressure is above the expected value. Often caused by a stuck-closed fuel return valve or a faulty pressure regulator.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Pressure regulator stuck closedCommon
- Return line blockedPossible
Parts involved
- Low Pressure Regulator
- Fuel Return Valve
- Low Pressure Sensor
P008B 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.