Volvo All Engines (2017 Emissions) Fault Code: P04009B PID: EMS Exhuast Gas Recirculation “A” Flow
Volvo All Engines (2017 Emissions) Fault Code: P04009B PID: EMS Exhuast Gas Recirculation “A” Flow
Circuit description
This function is used to calculate the EGR Mass Flow. The Engine Control Module (ECM) monitors the EGR differential pressure sensor and the EGR temperature sensor after cooler and uses these signals to calculate the EGR Mass Flow data.
Conditions for diagnostic trouble code (DTC)
EGR mass flow above calculated value
Probable cause
1) Connector
2) Wiring harness
3) EGR Valve
4) Charge air system leakage
5) EGR differential pressure sensor
Detailed information
The EGR mass flow is an calculated value based on a number of sensor signals and software calculations
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
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