Symptoms

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

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

Tech Notes

There is a service bulletin for the P0840 code for the following Nissan Models: 2007-2008 Altima 2007-2008 Rogue 2007-2008 Sentra The bulletin suggest replacing the transmission valve body. Service Bulletin Code P0840 Nissan Nissan has extended the CVT warranty from 5 years/60,000 to 10 years/120,000 miles

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.