Ensuring you are Ready for the Road Ahead , the Dorman Diesel Particulate Filter (DPF) Differential Pressure Sensor effectively measures exhaust backpressure, signaling when the powertrain control module (PCM) should clear the filter of diesel particulate matter (DPM). High amounts of DPM result in higher DPF pressure. This exhaust gas differential pressure sensor keeps the DPM in check, keeping you on the road longer. FleetPride is your First Click in Heavy Duty .