Powertrain, generic · Fuel and air metering

P01FA Turbocharger Outlet Pressure Sensor B Circuit

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. P01FA is the general electrical fault that the module does not classify as low or high. Without a plausible actual pressure, boost control usually limits boost.

Likely causes

Connector or pins at sensor B loose or corroded
Harness damaged (5 V reference, signal, ground)
Sensor faulty
Engine module or 5 V supply disturbed

Symptoms

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

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–250
Time0.3–1.5 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

P00F8P01FBP01FCP01FDP01FF

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