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U0601 Lost Communication With Particulate Filter Pressure Sensor A

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Particulate filter pressure sensor A measures the pressure drop across a diesel or gasoline particulate filter, the basis for soot load estimates and filter monitoring. Digital versions report over SENT. GM's 2025 diesel tables (25OBDG04A/B) call it differential pressure sensor loss of communication: it sets when the sensor reports an internal fault that shuts its SENT output, when 158 of 200 checks fail, or when no fresh message has come for over 12.5 s; it is Type A, so the MIL comes on in the first trip. Ford's 2023 diesel summary flags a SENT driver error or a line stuck high or low, and Ford's 2024 gasoline summary uses it for the filter sensors with 5 s to register. U0602, U0696 and U0697 cover sensors B to D.

Likely causes

SENT line, 5 V supply or ground interrupted or shorted
Sensor internal fault switching off its output (heat, moisture)
Corroded connector near the exhaust

Symptoms

  • Check engine light, on GM already in the first trip
  • Filter regeneration may run on a model only or be blocked
  • Reduced power on some diesels

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 asensor wiring

Related codes

U0602U0696U0697P2452P2453

References: gsi.ext.gm.com, fordservicecontent.com, fordservicecontent.com, en.wikipedia.org.