P01FBTurbocharger Outlet Pressure Sensor B Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Turbocharger outlet pressure sensor B is a second pressure sensor at a compressor outlet – for example one per turbo on twin-turbo engines or a second measuring point; sensor A has the codes P00F8–P00FC. It is a separate family from the boost pressure sensor: GM and Ford report the pressure ahead of the throttle under the boost sensor codes P0236–P0238. No manufacturer using the sensor B codes was found; FCA documents sensor A and a second outlet sensor. P01FB is the plausibility fault: the signal is electrically valid but does not fit. After a long stop all pressures should equal barometric pressure; while running the value is compared with a pressure modelled from airflow, speed and throttle – GM flags its boost sensor at deviations of roughly 25–30 kPa.
- What you may notice
- Check engine light on
- Loss of power, boost limited
- Limp mode possible
- Likely causes
- LikelySensor drifting or stuck
- PossibleLeaking charge air hose or blocked pressure port
- PossibleContact resistance at the connector
- RareFault in other model inputs (MAF, MAP)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €50 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.