Powertrain, generic · Fuel and air metering

P01FB Turbocharger Outlet Pressure Sensor B Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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.

Likely causes

Sensor drifting or stuck
Leaking charge air hose or blocked pressure port
Contact resistance at the connector
Fault in other model inputs (MAF, MAP)

Symptoms

  • Check engine light on
  • Loss of power, boost limited
  • Limp mode possible

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–300
Time0.5–2 h

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

Parts involved

turbocharger outlet pressure sensor bsensor wiringengine control module

Related codes

P00F9P01FAP01FFP0236P0299

References: law.cornell.edu, static.nhtsa.gov, gsi.ext.gm.com.