Engine-Codes - Nissan - P0840 NISSAN

P0840 NISSAN - Transmission Fluid Pressure Sensor 'A'

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
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 is the P0840 NISSAN code repair?

Start by checking 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

What is the cost to diagnose the P0840 NISSAN code

Labor: 1.0

The cost to diagnose the P0840 NISSAN code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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Possible Symptoms

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

P0840 NISSAN Meaning

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'.

More Information

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