Volvo All Engines (2010 Emissions) Fault Code: SPN 3936 FMI 0 PID: PSID 28 Aftertreatment DPF System
The function identifies and indicates malfunction of the aftertreatment diesel particulate filter (DPF) by analyzing the pressure drop over the aftertreatment DPF. This is done by making a check for deviation between sensor value and a model pressure drop. In some extreme cases the engine will derate.
Conditions for diagnostic trouble code (DTC):
1) High differential pressure across the filter (DPF)
Probable cause
1) Aftertreatment DPF Differential Pressure Sensor
2) Aftertreatment Diesel Particulate Filter (DPF)
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