Engine-Codes - Nissan - P0731 Nissan

P0731 Nissan Code - 1st. Gear Malfunction

- Code Popularity: 68,519 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the Code P0731 Nissan?

  • Low transmission fluid level
  • Dirty transmission fluid
  • Shift solenoids
  • Transmission mechanical problems
  • Transmission hydraulic control circuit

|How to Fix the P0731 Nissan Code?

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.

|Code P0731 Nissan Tech Notes

There are Factory Service bulletins for the following Nissan models:

1995-1996 Nissan Maxima
1995-1997 Nissan Sentra/200SX
1996-1997 Nissan Truck
1995-1997 Nissan Altima
1996-1997 Nissan Pathfinder
1995-1996 Nissan 240SX
1996-1997 Nissan Quest
Nissan Factory Service Bulletin OBDII Code P0731

2002 Nissan Sentra
2002 Nissan Altima
2002 Nissan Sentra and Altima Factory Service Bulletin OBDII Code P0731

|What is the Cost to Diagnose the Code P0731 Nissan?

Labor: 1.0

The cost to diagnose the P0731 Nissan code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

Does your Nissan have Safety Recalls? → Check here

|When is the P0731 Nissan Code Detected?

P0731 is detected when A/T cannot be shifted to the 1st gear position even if electrical circuit is good.

|What are Code P0731 Nissan Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)
  • Incorrect transmission shifting

|What Does the P0731 Nissan Code Mean?

This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by Transmission Control Module (TCM) as follows:

Torque converter slip ratio = A x C/B

A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from Engine Control Module (ECM)
C: Gear ratio determined as gear position which TCM supposes

If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

P0731 Nissan Code - 1st. Gear Malfunction

|Need more Information on the P0731 Nissan Code?

Need more information on how to fix the P0731 Nissan code? Get Access to Factory Service Manuals

|Need Help with the P0731 Nissan Code?

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