Volvo All Engines (2017 Emissions) Fault Code: P040901 PID: EMS EGR Differential Pressure Sensor

Volvo All Engines (2017 Emissions) Fault Code: P040901 PID: EMS EGR Differential Pressure Sensor

This Diagnostic Trouble Code (DTC) monitors and evaluates malfunctions in the (EGR) Exhaust Gas Recirculation Diff Pressure. A faulty (EGR) Exhaust Gas Recirculation differential Pressure can lead to uneven running and response problems.

Conditions for diagnostic trouble code (DTC):
1) General Electrical Failure

Observable symptoms
1) The exhaust brake does not function

Probable cause
1) Sensor
2) Damaged wiring harness