P0731 Nissan Code - 1st. Gear Malfunction
Quick Answer
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. Common causes include Low transmission fluid level, Dirty transmission fluid, Shift solenoids. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0731 Nissan indicates 1st. Gear Malfunction.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, Shift solenoids.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0731 Nissan Description
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.
What are the Possible Causes of the DTC P0731 Nissan?
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
How to Fix the DTC P0731 Nissan?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
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?
Labor: 1.0
To diagnose the P0731 Nissan code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Need Help with the Code?
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Information for Specific Nissan Models
- P0731 2002 Nissan Altima Sedan — 1st. Gear Malfunction
- P0731 2003 Nissan Altima Sedan — 1st. Gear Malfunction
- P0731 2004 Nissan Altima Sedan — 1st. Gear Malfunction
- P0731 2005 Nissan Altima Sedan — 1st. Gear Malfunction
- P0731 2006 Nissan Altima Sedan — 1st. Gear Malfunction
Frequently Asked Questions about P0731 Nissan Code
1. What are the common symptoms of OBDII code P0731 in a Nissan indicating a 1st gear malfunction?
- Common symptoms include harsh or delayed shifting into 1st gear, slipping gears, decreased fuel efficiency, and the transmission staying in a higher gear than necessary.
2. What are the possible causes of OBDII code P0731 in a Nissan?
- The code P0731 typically indicates a problem with the 1st gear ratio, which can be caused by issues such as faulty transmission components, low transmission fluid, a malfunctioning solenoid, or a defective torque converter.
3. How serious is OBDII code P0731 in a Nissan and should it be addressed immediately?
- OBDII code P0731 should be addressed promptly to prevent further damage to the transmission and ensure safe driving. Ignoring the issue can lead to more severe transmission problems and potentially costly repairs.
4. Can low transmission fluid cause OBDII code P0731 to appear in a Nissan?
- Yes, low transmission fluid levels can cause improper gear shifting and trigger code P0731 in a Nissan. It is essential to check and maintain the proper transmission fluid levels to prevent this issue.
5. What repair tips can help resolve OBDII code P0731 related to a 1st gear malfunction in a Nissan?
- Repair tips may include checking and topping up transmission fluid, inspecting and replacing damaged transmission components, diagnosing and fixing electrical issues, and performing a thorough transmission system inspection.
6. Is it safe to continue driving a Nissan with OBDII code P0731 present?
- It is not recommended to continue driving a Nissan with OBDII code P0731 present, as it can lead to further transmission damage and safety hazards. Seek professional diagnosis and repair as soon as possible.
7. How can a mechanic diagnose the exact cause of OBDII code P0731 in a Nissan?
- A mechanic can diagnose the exact cause of OBDII code P0731 by conducting a thorough inspection of the transmission system, performing a computerized scan to pinpoint the issue, and conducting various tests to identify the underlying problem accurately.
8. Can a DIY enthusiast fix OBDII code P0731 related to a 1st gear malfunction in a Nissan?
- While some basic troubleshooting steps like checking fluid levels can be done by a DIY enthusiast, resolving OBDII code P0731 usually requires professional expertise due to the complexity of transmission systems. It is advisable to seek help from a qualified mechanic.
9. How much does it typically cost to repair OBDII code P0731 in a Nissan caused by a 1st gear malfunction?
- The cost to repair OBDII code P0731 in a Nissan can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs. It is recommended to obtain quotes from reputable repair shops for an accurate estimate.
10. Can resetting the OBDII system clear code P0731 related to a 1st gear malfunction in a Nissan?
- Resetting the OBDII system may temporarily clear the code, but it will likely reappear if the underlying issue causing the 1st gear malfunction is not addressed. It is crucial to diagnose and fix the root cause of the problem for a lasting solution.
Discuss the causes and fixes for P0731 Nissan OBDII Code
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Help!!!!! 2000 maxima p0731 maybe in limp mode.. no power under load but in park ca. Get up to 4000 rpm and then stats shacking and tries to stall....just replaced the coils and plugs.... Definitely lost need help much appreciated
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You may ahve different problems. The P0731 has nothing to do with the engine performance. The P0731 is related to the transmission. Low transmission fluid a faulty transmission could cause the transmission to lock ans stall the engine. You should start by inspecting the transmission fluid. If the level and condition is OK, you should remove the transmission pan and inspect the pan for debris.
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I have a 97 Nissan Quest and it won't go past 3 RPM. The car jumps when I press on the gas pedal to hard.
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Start by checking the transmission fluid level and condition. If the fluid is OK, the you should have a transmission shop inspect the transmission.
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