P0840 Volvo Transmission Fluid Pressure Sensor A

Possible causes

– Transmission Fluid Pressure Sensor A harness is open or shorted
– Transmission Fluid Pressure Sensor A poor electrical connection
– Faulty Transmission Fluid Pressure Sensor A
– Transmission Valve Body

Symptoms

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

P0840 Volvo Description

The transmission fluid pressure sensor A (primary pressure sensor) detects primary pressure of Continuously Variable Transmission (CVT) and sends Transmission Control Module (TCM) the signal.