A short to voltage or chafed signal wire in the sensor D circuit; A faulty particulate filter pressure sensor D; Corroded, loose, or damaged electrical connector at the sensor or engine control module; A restricted or blocked pressure sensing tube or port causing an abnormal high reading; Water or debris intrusion into the sensor housing or connector; An internal fault in the engine control module affecting the sensor reference voltage; A missing or poor ground connection for the sensor circuit

DTC codes / P2Cxx · Hybrid propulsion / P2CED

P2CEDParticulate Filter Pressure Sensor D Circuit High

Q: What does code P2CED mean?

Particulate Filter Pressure Sensor D Circuit High. P2CED means the engine control module has detected an abnormally high voltage on the signal circuit of the particulate filter pressure sensor, identified as sensor D. The sensor measures the pressure difference across the diesel particulate filter, and a high signal voltage tells the computer that the pressure reading is outside its expected range, which can prevent accurate filter monitoring and regeneration.

P2CED means the engine control module has detected an abnormally high voltage on the signal circuit of the particulate filter pressure sensor, identified as sensor D. The sensor measures the pressure difference across the diesel particulate filter, and a high signal voltage tells the computer that the pressure reading is outside its expected range, which can prevent accurate filter monitoring and regeneration.

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
A message on the dashboard indicating a particulate filter or emissions system fault
Reduced engine power or limp mode in some vehicles as a protective measure
Poor fuel economy or more frequent regeneration cycles
Black smoke or rough running if the filter becomes overloaded
Failure of the onboard diagnostic monitor to complete, preventing inspection readiness

Common causes, most likely first

A short to voltage or chafed signal wire in the sensor D circuit
A faulty particulate filter pressure sensor D
Corroded, loose, or damaged electrical connector at the sensor or engine control module
A restricted or blocked pressure sensing tube or port causing an abnormal high reading
Water or debris intrusion into the sensor housing or connector
An internal fault in the engine control module affecting the sensor reference voltage
A missing or poor ground connection for the sensor circuit

How to diagnose and fix it

Verify the code with a scan tool and check for related codes in the particulate filter system
Inspect the sensor D connector and wiring for corrosion, chafing, or loose pins, and repair as needed
Check the pressure sensing tubes and ports for blockage, cracks, or disconnection, and clean or replace them
Measure the sensor signal voltage with a multimeter and compare it to the manufacturer's specification
Test the sensor reference voltage and ground at the connector to rule out wiring or module faults
Replace the particulate filter pressure sensor D if testing confirms it is faulty
Clear the codes and perform a road test or forced regeneration to verify the repair and reset the monitor

What a high signal voltage really tells you

A high voltage on the signal circuit often indicates a short to voltage rather than a failed sensor, so inspect the harness for damage before replacing parts.
Blocked pressure sensing tubes can mimic a sensor failure by causing the sensor to output a high signal, and this is a common oversight during diagnosis.
The code may set intermittently due to water intrusion in the connector, which can corrode pins and cause a high resistance path to voltage.
On some vehicles, a faulty engine control module reference voltage can affect multiple sensors, so check for other sensor codes before condemning the module.
Replacing the sensor without checking the filter's actual soot load can lead to a repeat failure if the underlying cause is a restricted filter.

Can I keep driving with P2CED?

You can usually drive the vehicle with this code, but avoid heavy loads and long trips until it is repaired, because continued driving with a faulty pressure sensor can lead to improper filter regeneration and potential filter damage.

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.