Powertrain, generic (extended)

P2CE7 Particulate Filter Pressure Sensor C Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modeNo

P2CE7 means the raw signal of filter pressure sensor C has dropped below its electrical floor, the typical picture of a signal wire shorted to ground or a lost 5 V supply. GM's 2025 diesel tables, where C is the relative pressure sensor behind the particulate filter, set it when the raw value is under 0.02 % in 158 of 200 samples taken every 12.5 ms with the ignition in range and the engine not cranking; it is Type B, so the lamp follows on the second trip. Ford's 2024–25 petrol summary uses the same code for an analog sensor C on its gasoline particulate filters, with a limit of 0.3 V held for 5 s. Checking reference, ground and signal at the plug comes before replacing the sensor. The high counterpart is P2CE8; sensor D has P2CEC.

Likely causes

Signal wire of sensor C shorted to ground, often from heat damage near the exhaust

5 V supply to the sensor interrupted

Sensor C internally failed with output stuck low

Symptoms

Warning lamp on
Live data shows sensor C at minimum regardless of engine load
Regeneration planning relies on a soot model only

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, fordservicecontent.com, law.cornell.edu.