The Diesel Particulate Filter (DPF) is generally designed with a steel housing, and is used on diesel engine vehicles to clean exhaust emissions. When the number of soot particles in the DPF increases, the exhaust pressure will increase accordingly as indicated by the PCM and the Diesel Particulate Filter Sensor. In this case, the regeneration process in the filter elements is initiated. Once regeneration is initiated in the DPF, pressures will drop to the programmed levels.
If the Powertrain Control Module detects a DPF pressure condition above the allowable parameters, the DTC P244B OBD2 code will be set and the Check Engine light will illuminate on the vehicle’s dashboard.