Powertrain, generic (extended)

P2CE8 Particulate Filter Pressure Sensor C Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

P2CE8 is the high-side electrical fault of filter pressure sensor C: its output sits above the range a working sensor can produce. GM's 2025 diesel tables aim this test at a broken line or a battery-voltage short and set the code when the raw signal of the downstream relative pressure sensor exceeds 99.80 % in 158 of 200 samples (12.5 ms task), Type B with two trips. On Ford's 2024–25 gasoline particulate filters with analog sensors the limit is 4.73 V for 5 s. An open sensor ground or a signal wire touching the 5 V reference are the usual electrical causes; heat-damaged harness sections near the exhaust deserve a close look. Because a pinned-high value would look like an extremely full filter, the controller ignores it. Low voltage is P2CE7, the D sensor equivalent P2CED.

Likely causes

Sensor ground or signal wire open

Signal wire shorted to 5 V reference or battery voltage

Sensor C internally failed with output stuck high

Symptoms

Warning lamp on
Live data shows sensor C at maximum even at idle
Regeneration requests may become more frequent

Repair estimate

DifficultyMediumDIY possible

Parts and labour€30–350

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.