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P0731 Nissan Code - 1st. Gear Malfunction

- Code Popularity: 74,132 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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What are the Possible Causes of the DTC P0731 Nissan?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Low transmission fluid level
  • Dirty transmission fluid
  • Shift solenoids
  • Transmission mechanical problems
  • Transmission hydraulic control circuit
⚠ Does your Nissan have Safety Recalls? → Check here

How to Fix the DTC P0731 Nissan?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Code 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

Search for P0731 Nissan Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0731 Nissan code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

When is the 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 Possible Symptoms?

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

Code P0731 Nissan Description

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.

OBDII Code P0731 Nissan - 1st. Gear Malfunction - AutoCodes.com
P0731 Nissan Code - 1st. Gear Malfunction

Need More Information on the Code?

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Code P0731 Nissan comments

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