Powertrain, generic · Fuel and air metering

P01FC Turbocharger Outlet Pressure Sensor B Circuit Low

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. P01FC means the signal voltage stays below its lower limit – usually a signal wire shorted to ground or a missing 5 V reference. For comparison, GM sets its boost sensor low code below 14.4 % of 5 V, Ford below 0.19 V for 5 s.

Likely causes

Signal wire shorted to ground
5 V reference open or shorted
Sensor faulty internally

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

P00FAP01FAP01FDP01FEP0237

References: law.cornell.edu, gsi.ext.gm.com, fordservicecontent.com.