VOLVOUU All Engines (2017 Emissions) Fault Code: P040984 PID: EMS EGR Differential Pressure Sensor

VOLVOUU All Engines (2017 Emissions) Fault Code: P040984 PID: EMS EGR Differential Pressure Sensor

Circuit description
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)
Abnormal system response, most likely low flow

Observable symptoms
Possible engine de-rate
Exhaust leakage
Black smoke

Probable cause
1) Connector
2) Wiring harness
3) Clogged ports
4) EGR Cooler
5) EGR system pipe and connections
6) EGR differential pressure sensor

Detailed information

Activation
The diagnostic trouble code (DTC) is first set after 30 min when driving with varying engine loads

At idle the diagnostic trouble code (DTC) is normally not set to active

Deactivation
The diagnostic trouble code (DTC) will be shown as inactive when the ignition key is turned to the 0 position

To fully verify the repair it may be necessary to activate vehicle functions or perform a test drive