P008B Low Pressure Fuel System Pressure - Too High

Some engines, mainly gasoline direct injection with a demand-controlled in-tank pump, have their own pressure sensor in the low-pressure line between the tank pump and the high-pressure pump. The engine control module compares this supply pressure with its target. P008B is set when the supply pressure stays too high. Manufacturer bulletins name a faulty low-pressure sensor as the most common cause, for example from fuel entering the sensor and falsifying its signal; a mechanical gauge test clarifies whether the pressure is really too high.

Likely causes

Symptoms

• Check engine light on
• Often no drivability symptoms

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.