P0408 Volvo Exhaust Gas Recirculation Sensor B Circuit High

Possible causes

– EGR volume control solenoid valve
– EGR volume control solenoid valve harness is open or shorted
– EGR volume control solenoid valve circuit poor electrical connection
– EGR temperature sensor and circuit

What about the obd code?

An improper voltage signal is sent to ECM through the valve

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Engine hesitation

P0408 Volvo Description

Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control