Powertrain, generic (extended)

P2CE5 Particulate Filter Pressure Sensor C Circuit

Check engine lightOn

EmissionsRelevant

Drive cycleRequired

Limp modeNo

Two manufacturers use P2CE5, with different meanings. In GM's 2025 diesel tables 25OBDG04A and 25OBDG04B, sensor C is the downstream relative pressure sensor that reads gauge pressure behind the particulate filter. Despite the circuit title, GM uses the code as an offset test without exhaust flow: with the engine stopped the reading should be zero, and an offset learned more than 2.20 % away from its nominal value sets a Type B fault without debounce. Ford's 2024–25 petrol summary, which covers particulate filters on both banks, uses P2CE5 for the general circuit fault of a digital SENT sensor C, registered within 5 s; lost communication with it is U0696. A drifted sensor, condensate in the hose or a damaged connector are typical. Regeneration and back pressure monitoring lose a measured input.

Likely causes

Sensor C zero point drifted (offset at standstill too large)

Condensate or soot in the sensing hose holding pressure

Damaged connector or wiring of a digital sensor C

Sensor C internally faulty

Symptoms

Warning lamp on, usually after two trips on GM diesels
Particulate filter regeneration may run less accurately or more often
Usually no noticeable change in driving

Repair estimate

DifficultyMediumDIY possible

Parts and labour€40–350

Time0.3–1.5 h

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

Parts involved

dpf pressure sensor cwiring harnessecm

References: gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com.