Faulty Diesel Particulate Filter (DPF)
Faulty Diesel Particulate Filter Exhaust Differential Pressure Sensor
Diesel Particulate Filter Exhaust Differential Pressure Sensor harness is open or shorted
Diesel Particulate Filter Exhaust Differential Pressure Sensor circuit poor electrical connection
Engine Light ON (or Service Engine Soon Warning Light)
The exhaust differential pressure sensor measures the pressure difference across the inlet and outlet of the Diesel Particulate Filter (DPF). The pressure difference across the diesel particulate filter increases as captured particulates in the diesel particulate filter increase. The Engine Control Module (ECM) supplies a 5 V reference circuit and a ground on the low reference circuit. The exhaust differential pressure sensor provides a signal voltage to the ECM, relative to the backpressure as a function of exhaust flow, diesel particulate filter temperature, and diesel particulate filter soot loading. The ECM converts the signal voltage input to a pressure value. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the diesel particulate filter exhaust differential pressure sensor is higher than the maximum threshold.