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U0697 Lost Communication With Particulate Filter Pressure Sensor D

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

Sensor D is the fourth filter pressure slot and appears only in Ford's 2024 gasoline OBD summary, which watches particulate filters on both banks (P226D and P226E for a missing substrate). There U0697 sits with P2CEA in the circuit and lost-communication check for SENT-type pressure sensors A to D: it runs all the time and needs 5 s to log a fault. Ford keeps a separate functional check (P2CEB) and, for analog parts, low and high limits of 0.3 and 4.73 V. GM's 2025 diesel tables go no further than C. A missing D reading leaves the filter it serves without a measured pressure drop, so soot load and the missing-substrate test fall back on models or wait. U0696 refers to sensor C, U0601 and U0602 to A and B.

Likely causes

Wiring to filter pressure sensor D damaged

Sensor D stopped transmitting

Connector corroded or unlatched

Symptoms

Check engine light
Particulate filter monitor for one bank 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 dvehicle bus wiring

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