Transmission Fluid Pressure Sensor ‘A’
Table of contents
P0840 NISSAN Possible Causes
- Faulty Transmission Fluid Pressure Sensor ‘A’
- Transmission Fluid Pressure Sensor ‘A’ harness is open or shorted
- Transmission Fluid Pressure Sensor ‘A’ poor electrical connection
- Transmission Valve Body
How do I fix code P0840 NISSAN?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- There is a factory service bulletin for the following Nissan Models:
- 2007-2008 Nissan Altima
- 2007-2008 Nissan Rogue
- 2007-2008 Nissan Sentra
- The bulletin suggests replacing the transmission valve body.
- 2007-2008 Nissan Altima, Rogue, Sentra Factory Service Bulletin OBDII Code P0840
- 2007 Nissan Maxima
- 2007 Nissan Maxima Factory Service Bulletin OBDII Code P0840
- For Nissan vehicles with CVT transmission, Nissan has extended the CVT warranty from 5 years/60,000 to 10 years/120,000 miles
Cost of diagnosing the P0840 NISSAN code
The cost of diagnosing the P0840 NISSAN code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0840 NISSAN Description
The Transmission Fluid Pressure Sensor ‘A’ (primary pressure sensor) detects primary pressure of Continuously Variable Transmission (CVT) and sends the Transmission Control Module (TCM) the signal. The Diagnostic Trouble Code (DTC) will set when the TCM detects no signal from the Transmission Fluid Pressure Sensor ‘A’.