Signal wire shorted to voltage; Open sensor ground circuit; Faulty differential pressure sensor; Damaged connector or water ingress.

Diesel particulate filter (DPF)

P2455 Diesel Particulate Filter (DPF) Pressure Sensor A Circuit High

The ECU monitors the voltage of the DPF differential pressure sensor. P2455 is set when the signal stays above the maximum expected voltage.

Common causes

Signal wire shorted to voltage
Open sensor ground circuit
Faulty differential pressure sensor
Damaged connector or water ingress

Typical symptoms

Check engine light (MIL) on
Regeneration disabled
Reduced power or limp mode on some vehicles

P2455 and NuoVolta

When the DPF and its pressure sensor have been removed for off-road or motorsport use, where permitted by law, the NuoVolta DPF / ADV Removal solution adjusts the ECU calibration and the DTC removal feature can disable this code. Otherwise, check the sensor wiring and ground first.

DPF / ADV Removal Available for 189 ECUs

Related codes

P2002Particulate Filter Efficiency Below Threshold (Bank 1) P242FDiesel Particulate Filter (DPF) Restriction - Ash Accumulation P244ADiesel Particulate Filter (DPF) Differential Pressure Too Low (Bank 1) P244BDiesel Particulate Filter (DPF) Differential Pressure Too High (Bank 1) P2453Diesel Particulate Filter (DPF) Pressure Sensor A Circuit Range/Performance P2454Diesel Particulate Filter (DPF) Pressure Sensor A Circuit Low P2458Diesel Particulate Filter (DPF) Regeneration Duration P2459Diesel Particulate Filter (DPF) Regeneration Frequency

Diagnose and repair real faults first. Removing or disabling emission systems is only permitted where allowed by law, for example for off-road or motorsport use.