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U069F Lost Communication With Exhaust Pressure Sensor C

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Exhaust pressure sensor C is a third pressure measuring point in the exhaust; where it sits is up to the manufacturer, for example behind the turbine or on a second exhaust branch. U069F: this digital sensor, typically a SENT device, no longer supplies usable frames. No manufacturer documents U069F publicly. The nearest documented case is sensor A on Ford's 2023 diesels (6.7 L, 3.0 L): Ford stores U0691 for a transmission error or data gap, a signal wire pinned at one level, or a self-reported sensor fault, watched continuously over 5 s. Letters differ between makers, so these limits are not transferable. CARB requires a coded digital input that falls silent to have a code of its own. Wired analog versions of sensor C report P2E54 to P2E57. Expect the MIL and substitute values for boost or EGR control.

Likely causes

Signal, supply or ground wire of sensor C damaged by exhaust heat
Sensor C reports an internal fault or stops sending
Moisture or corrosion in the sensor connector

Symptoms

  • Check engine light
  • Possibly less boost or power
  • Pressure value missing or frozen in live data

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–400
Time0.5–2 h

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

Parts involved

exhaust pressure sensor cvehicle bus wiring

Related codes

U0691U0692P2E54P2E55P2E56P2E57

References: fordservicecontent.com, law.cornell.edu, en.wikipedia.org.