Faulty particulate filter pressure sensor C, internally shorted or failed; Damaged or chafed wiring between the sensor and the powertrain control module, causing a short to ground; Corroded or loose electrical connector at the sensor or intermediate harness; Low reference voltage or ground circuit fault shared with other sensors; Water intrusion into the sensor or connector, leading to signal corruption; Exhaust system blockage or excessive backpressure that forces the sensor out of range; Aftermarket or incorrect sensor installed previously that does not meet specification

DTC codes / P2Cxx · Hybrid propulsion / P2CE7

P2CE7Particulate Filter Pressure Sensor C Circuit Low

Q: What does code P2CE7 mean?

Particulate Filter Pressure Sensor C Circuit Low. P2CE7 means the powertrain control module has detected an abnormally low voltage signal on the circuit for the particulate filter pressure sensor C, which is one of the sensors used to monitor the pressure differential across the diesel particulate filter. The computer expects the sensor signal to stay within a specific voltage range, and a low reading indicates either a wiring short to ground, a failed sensor, or a reference voltage problem.

P2CE7 means the powertrain control module has detected an abnormally low voltage signal on the circuit for the particulate filter pressure sensor C, which is one of the sensors used to monitor the pressure differential across the diesel particulate filter. The computer expects the sensor signal to stay within a specific voltage range, and a low reading indicates either a wiring short to ground, a failed sensor, or a reference voltage problem.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Reduced engine power or limp mode if the fault triggers a derate strategy
Poor fuel economy or frequent active regeneration cycles
A message on the dash indicating a particulate filter or emissions system fault
Rough running or hesitation if the sensor signal is used for regeneration control
Possible black smoke or increased soot output in severe cases

Common causes, most likely first

Faulty particulate filter pressure sensor C, internally shorted or failed
Damaged or chafed wiring between the sensor and the powertrain control module, causing a short to ground
Corroded or loose electrical connector at the sensor or intermediate harness
Low reference voltage or ground circuit fault shared with other sensors
Water intrusion into the sensor or connector, leading to signal corruption
Exhaust system blockage or excessive backpressure that forces the sensor out of range
Aftermarket or incorrect sensor installed previously that does not meet specification

How to diagnose and fix it

Scan all modules and record freeze-frame data for P2CE7 and any related codes before clearing anything
Visually inspect the sensor, connector, and harness for damage, corrosion, or loose pins
Measure reference voltage and ground at the sensor connector with the key on and engine off
Backprobe the signal wire and compare the voltage reading to the manufacturer's expected range
Check for exhaust backpressure or a restricted particulate filter that could skew sensor readings
If wiring and voltage checks pass, replace the particulate filter pressure sensor C with a quality part
Clear codes, perform a road test, and verify the monitor runs without resetting the fault

What the pressure sensor C code hides

A low signal code often results from a short to ground in the harness where it rubs against a bracket or heat shield, not from a failed sensor.
Technicians sometimes replace the sensor only to find the connector pins are pushed back or corroded, so always perform a pin drag test.
This code can be set by a shared reference voltage circuit that also feeds other sensors, so check for additional codes on those circuits.
Excessive soot loading or a cracked filter can cause pressure readings that mimic a sensor fault, so verify actual backpressure before condemning the sensor.
After repairs, a regeneration may be required to reset learned values, and skipping that step can cause the code to return.

Can I keep driving with P2CE7?

You can usually drive the vehicle short distances to a repair shop, but avoid heavy loads, sustained high speeds, or towing because a faulty pressure sensor can disrupt regeneration and lead to filter damage. If the engine enters limp mode or you notice excessive smoke, stop driving and seek professional diagnosis.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.