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U0602 Lost Communication With Particulate Filter Pressure Sensor B

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

Pressure sensor B serves a second particulate filter or a second measuring point, for example on engines with one gasoline particulate filter per bank. The code means its digital SENT output has stopped delivering usable frames to the engine controller. Ford's 2024 gasoline OBD summary lists U0602 with P245E in the check for SENT-type filter pressure sensors A to D, running continuously and needing 5 s to register; analog versions of the same sensors use the circuit low/high codes instead. CARB 1968.2 requires lost communication on a coded digital input to get its own fault code, apart from circuit and range faults. U0601 refers to sensor A, U0696 and U0697 to C and D. Filter loading for that branch must then be estimated without measurement.

Likely causes

Damaged SENT, supply or ground wire to sensor B
Sensor B electronics failed
Loose or corroded connector at sensor B

Symptoms

  • Check engine light on
  • Particulate filter monitor for the affected branch incomplete

Repair estimate

DifficultyMediumDIY possible
Parts and labour€60–400
Time0.3–1.5 h

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

Parts involved

dpf pressure sensor bsensor wiring

Related codes

U0601U0696U0697P245E

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