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
– Transmission Fluid Pressure Sensor A poor electrical connection
– Faulty Transmission Fluid Pressure Sensor A
– Transmission Valve Body
Tech description
There is a service bulletin for the P0840 code for the following Nissan Models:
2007-2008 Nissan Altima
2007-2008 Nissan Rogue
2007-2008 Nissan Sentra
The bulletin suggest replacing the transmission valve body.
Nissan Factory Service Bulletin OBDII Code P0840
2007 Nissan Maxima
Nissan Factory Service Bulletin OBDII Code P0840
For Nissan vehicles with with CVT transmission, Nissan has extended the CVT warranty from 5 years/60,000 to 10 years/120,000 miles
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P0840 NISSAN OBD Code Description