P008B

Low Pressure Fuel System Pressure - Too High

Q: Is it safe to drive with P008B?

Not for long. High low-side pressure can force a rich mixture and cause stalling or hard running. Get it diagnosed promptly to avoid being stranded and to protect fuel-system parts.

Q: Can I just clear P008B?

It returns as soon as the pressure reads high again. The sensor, return line, or pump/regulator fault behind it has to be repaired first.

Fuel delivery / pressure Generic OBD-II High

What it means

P008B means the ECM measured higher-than-expected pressure in the low-pressure (lift-pump) side of the fuel system. That side feeds the high-pressure pump or injectors, and pressure that runs too high can upset fueling — making the engine run rich, lose power, or stall. The cause is often a faulty pressure sensor, a restricted return line, or a pump/regulator commanding too much pressure.

High

Can I keep driving? Limited — excess low-side fuel pressure can make the engine run rich, lose power, or stall. It may keep running, but have it diagnosed before driving far.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Power loss or hesitation
Rich running (fuel smell, black smoke) or poor economy
Rough running or stalling

Common causes

Most likely first

Faulty low-side fuel pressure sensor reading highLikely
Restricted or kinked fuel return line raising system pressureCommon
Fuel pump control module or lift pump commanding too much pressureCommon
Faulty fuel pressure regulator on the low-pressure sideLess often
Wiring or connector fault on the pressure sensor circuitLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and compare the sensor's reported pressure to a mechanical gauge on the fuel rail.
If the gauge disagrees with the sensor, suspect the sensor or its wiring; if it agrees, the pressure really is high.
Inspect the fuel return line for kinks, restriction, or blockage.
Check fuel pump / control module operation and the pressure regulator.
Repair or replace the confirmed faulty component, then clear and road-test.

FAQ

Quick answers

Is it safe to drive with P008B?+

Not for long. High low-side pressure can force a rich mixture and cause stalling or hard running. Get it diagnosed promptly to avoid being stranded and to protect fuel-system parts.

Can I just clear P008B?+

It returns as soon as the pressure reads high again. The sensor, return line, or pump/regulator fault behind it has to be repaired first.

Read & clear P008B yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX