Powertrain, generic · Fuel and air metering, auxiliary emission controls

P00FB Turbocharger Outlet Pressure Sensor A Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

The turbocharger outlet pressure sensor A measures the pressure directly after the compressor, usually ahead of the charge air cooler; FCA fits it as a combined temperature and pressure sensor. Boost control and compressor protection use the value. P00FB means the signal voltage is above its valid range: typically a signal wire shorted to the 5 V reference or battery voltage, an open ground, or a failed sensor. It does not mean the boost really is too high – that would be P0234. The circuit is monitored continuously from key-on; comparable GM pressure sensors fail above 86–97 % of the reference for about 4 s. The engine then works with a substitute value and may limit boost. GM and Ford do not use this code family in their published summaries – they rely on the boost sensor ahead of the throttle (P0235–P0238) – so no manufacturer document naming exactly this code was found.

Likely causes

Signal wire shorted to 5 V reference or battery voltage
Ground (low reference) wire open or connector corroded
Sensor faulty internally (oil mist, heat at compressor outlet)
Engine control module faulty

Symptoms

  • Check engine light on
  • Loss of power or limp mode with boost limit
  • Further pressure plausibility codes possible

Repair estimate

DifficultyEasyDIY possible
Parts and labour€20–250
Time0.3–1 h

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

Parts involved

turbocharger outlet pressure sensor asensor wiringsensor reference voltage

Related codes

P00F8P00F9P00FAP00FCP0238P0234

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