Faulty particulate filter pressure sensor C itself, due to internal failure or contamination.; Damaged, cracked, or blocked pressure sensor hose or tube connecting the sensor to the filter.; Water or soot contamination inside the sensor or its pressure lines.; Corroded or loose electrical connector at the sensor, or damaged wiring in the sensor circuit.; Exhaust leaks upstream of the pressure sensor tap, causing false pressure readings.; A genuinely restricted or damaged particulate filter that pushes the sensor signal beyond its normal range.; Software or calibration issue in the engine control module (ECM) that misinterprets a valid sensor signal.

DTC codes / P2Cxx · Hybrid propulsion / P2CE6

P2CE6Particulate Filter Pressure Sensor C Range/Performance

Q: What does code P2CE6 mean?

Particulate Filter Pressure Sensor C Range/Performance. P2CE6 means the engine computer has detected that the particulate filter pressure sensor C is reporting a signal outside its expected range or behaving erratically during the self-test. The sensor measures the pressure difference across the diesel particulate filter (DPF), and the computer uses that reading to judge soot loading and trigger regeneration; a range or performance fault means the signal is not tracking reality.

P2CE6 means the engine computer has detected that the particulate filter pressure sensor C is reporting a signal outside its expected range or behaving erratically during the self-test. The sensor measures the pressure difference across the diesel particulate filter (DPF), and the computer uses that reading to judge soot loading and trigger regeneration; a range or performance fault means the signal is not tracking reality.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaHybrid propulsion

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms.
A message on the dash indicating the particulate filter is full or regeneration is required.
Reduced engine power or limp mode if the fault escalates and the computer cannot trust the pressure reading.
Frequent or failed DPF regenerations, leading to increased fuel consumption.
Black smoke or rough running in severe cases where the filter becomes overloaded.
A stored code for particulate filter efficiency or regeneration performance alongside P2CE6.

Common causes, most likely first

Faulty particulate filter pressure sensor C itself, due to internal failure or contamination.
Damaged, cracked, or blocked pressure sensor hose or tube connecting the sensor to the filter.
Water or soot contamination inside the sensor or its pressure lines.
Corroded or loose electrical connector at the sensor, or damaged wiring in the sensor circuit.
Exhaust leaks upstream of the pressure sensor tap, causing false pressure readings.
A genuinely restricted or damaged particulate filter that pushes the sensor signal beyond its normal range.
Software or calibration issue in the engine control module (ECM) that misinterprets a valid sensor signal.

How to diagnose and fix it

Scan all modules and record freeze-frame data for P2CE6, then clear the code and test-drive to see if it returns.
Visually inspect the pressure sensor, its electrical connector, and the pressure hoses for cracks, blockages, or contamination.
Check the sensor's live pressure reading with a scan tool and compare it to expected values at key-on, engine-off and during a road test.
Perform a smoke test or visual check for exhaust leaks between the filter and the pressure sensor tap.
Measure the sensor reference voltage and signal voltage with a multimeter to confirm wiring integrity and sensor output.
If the sensor and wiring test good, carry out a particulate filter pressure differential test to assess filter restriction.
Replace the faulty pressure sensor or damaged hose as needed, clear the code, and verify the repair with a regeneration test drive.

Pressure sensor faults that mimic filter failure

A clogged or disconnected pressure hose often sets P2CE6 before any filter problem exists, so always inspect the hoses before condemning the sensor.
The sensor C designation can refer to a second or third pressure sensor on some systems, so confirm the exact sensor location in the service information rather than assuming it is the primary one.
Water ingress into the pressure sensor is a common cause on vehicles that operate in wet or humid conditions, and it can produce intermittent range faults that clear when the sensor dries out.
A genuine DPF restriction can cause the pressure sensor to exceed its normal range, so a range fault does not automatically mean the sensor is defective.
After replacing the sensor, some vehicles require a relearn or adaptation procedure with a scan tool to avoid a repeat code.

Can I keep driving with P2CE6?

You can usually continue driving to a workshop, but avoid long trips or heavy loads until the fault is diagnosed, because an untrusted pressure reading can prevent regeneration and lead to a blocked particulate filter. If the engine enters limp mode or the filter warning light comes on, stop driving and seek service.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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