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U0692 Lost Communication With Exhaust Pressure Sensor B

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

Exhaust pressure sensor B is a second pressure point in the exhaust, whose location the maker defines, for instance on the other bank or behind the turbine. U0692 means its digital output, usually SENT, has stopped delivering valid frames. Code-specific documentation from a manufacturer is not public. Ford's 2023 diesel summary has only one exhaust pressure sensor, the SENT unit ahead of the turbine with U0691, and GM's 2025 diesel tables list no B sensor. CARB names exhaust pressure sensor output among the values diesel OBD systems must report and requires a separate code when a digitally coded input stops communicating. Analog circuit faults of sensor B are P047A to P047E; sensor C has U069F. What the driver notices depends on what the reading is used for, ranging from nothing beyond the lamp to reduced power.

Likely causes

Wiring to pressure sensor B damaged by exhaust heat

Sensor B electronics failed

Connector corroded

Symptoms

Check engine light
Possibly reduced power

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 bvehicle bus wiring

References: law.cornell.edu, fordservicecontent.com.