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Engine-Codes – Nissan – P0734 2002 Nissan Altima Sedan

P0734 2002 Nissan Altima Sedan Code - 4th. Gear Malfunction

Quick Answer

The P0734 code for a 2002 Nissan Altima Sedan indicates a malfunction in the vehicle's 4th gear. Common causes include Low transmission fluid levels, Faulty transmission solenoids, Damaged or corroded wiring in the transmission system. 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
P0734 2002 Nissan Altima Sedan indicates 4th. Gear Malfunction.
Common causes
Common causes include Low transmission fluid levels, Faulty transmission solenoids, Damaged or corroded wiring in the transmission system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0734 2002 Nissan Altima Sedan Description

The P0734 code for a 2002 Nissan Altima Sedan indicates a malfunction in the vehicle's 4th gear. This means that the transmission is having trouble engaging or maintaining 4th gear, which can lead to a variety of performance issues. When the transmission fails to shift into or stay in 4th gear properly, it can result in poor fuel efficiency, rough shifting, and overall reduced driving performance.

OBDII Code P0734 2002 Nissan Altima Sedan - 4th. Gear Malfunction
P0734 2002 Nissan Altima Sedan Code - 4th. Gear Malfunction

Common Causes of P0734 2002 Nissan Altima Sedan

  1. Low transmission fluid levels
  2. Faulty transmission solenoids
  3. Damaged or corroded wiring in the transmission system
  4. Internal mechanical issues within the transmission
  5. Electronic control module (ECM) malfunctions

Symptoms of P0734 2002 Nissan Altima Sedan

  1. Delayed or harsh shifting when trying to engage 4th gear
  2. Slipping out of 4th gear while driving
  3. RPM spikes or drops when attempting to shift into 4th gear
  4. Reduced fuel efficiency due to improper gear engagement
  5. Illumination of the Check Engine Light on the dashboard

How to Fix P0734 2002 Nissan Altima Sedan

  1. Begin by checking the transmission fluid level and condition. Top off or replace the fluid if necessary.
  2. Inspect and test the transmission solenoids for proper functioning. Replace any faulty solenoids.
  3. Check the wiring harness for any damage or corrosion. Repair or replace any affected wiring.
  4. Perform a thorough diagnostic scan to identify any internal mechanical issues within the transmission. Repair or replace damaged components as needed.
  5. If all else fails, consider reprogramming or replacing the electronic control module (ECM) to address any malfunctions causing the 4th gear malfunction.

Cost to Fix P0734 2002 Nissan Altima Sedan

The typical repair costs for addressing a P0734 code in a 2002 Nissan Altima Sedan can range from $200 to $800, depending on the specific cause of the issue and the extent of the repairs needed. This estimate includes parts and labor, but actual costs may vary based on the location of the repair shop, the make and model of the vehicle, and the type of engine. It's recommended to obtain quotes from multiple auto repair shops to ensure the best price for the necessary repairs. Keep in mind that diagnostic time and labor rates can also impact the final cost of the repair.

What does this mean?

Tech Notes for P0734 2002 Nissan Altima Sedan

Start by inspecting the transmission fluid level and condition, and change fluid if necessary.



There is a Factory Service Bulletin for the 2002 Nissan Altima:

2002 Nissan Altima Factory Service Bulletin OBDII Code P0734

When is the Code Detected?

P0734 is detected when A/T cannot be shifted to the 4th gear position even if electrical circuit is good.

Need more information about the P0734 2002 Nissan Altima Sedan code?

Need more information on how to fix the P0734 2002 Nissan Altima Sedan code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0734 2002 Nissan Altima Sedan Code

1. What does OBDII code P0734 mean on a 2002 Nissan Altima Sedan?

Code P0734 indicates a 4th gear malfunction in the automatic transmission of the 2002 Nissan Altima Sedan.

2. What are common symptoms of OBDII code P0734 in a 2002 Nissan Altima Sedan?

Common symptoms of code P0734 include harsh shifting, slipping gears, delayed engagement, and the transmission staying in limp mode.

3. What are possible causes of OBDII code P0734 in a 2002 Nissan Altima Sedan?

Potential causes of code P0734 in the 2002 Nissan Altima Sedan include low transmission fluid levels, faulty shift solenoids, a worn clutch, or internal transmission damage.

4. How can I diagnose OBDII code P0734 in a 2002 Nissan Altima Sedan?

Diagnosing code P0734 may involve checking the transmission fluid level and condition, conducting a visual inspection of the transmission components, and using a scan tool to monitor transmission data.

5. Can driving with OBDII code P0734 in a 2002 Nissan Altima Sedan cause further damage?

Continuing to drive with code P0734 may lead to additional damage to the transmission components, potentially resulting in a more costly repair.

6. How can I repair OBDII code P0734 in a 2002 Nissan Altima Sedan?

Repairing code P0734 may involve addressing the root cause of the issue, such as replacing faulty shift solenoids, servicing the transmission, or rebuilding the transmission if internal damage is present.

7. Is it safe to reset the OBDII code P0734 in a 2002 Nissan Altima Sedan without fixing the underlying issue?

Resetting the code without fixing the underlying problem may temporarily clear the check engine light, but the issue will likely resurface, and driving with a malfunctioning transmission can be unsafe.

8. How much does it cost to repair OBDII code P0734 in a 2002 Nissan Altima Sedan?

The cost of repairing code P0734 in a 2002 Nissan Altima Sedan can vary depending on the extent of the damage and the specific components that need to be replaced or repaired. It is recommended to consult a professional for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code P0734 in a 2002 Nissan Altima Sedan?

While some aspects of diagnosing and repairing code P0734 may be within reach of experienced DIY enthusiasts, transmission repairs can be complex and may require specialized tools and expertise. It is advisable to seek professional help for transmission-related issues.

10. How often does OBDII code P0734 occur in a 2002 Nissan Altima Sedan?

Code P0734 is not limited to the 2002 Nissan Altima Sedan and can occur in any vehicle with an automatic transmission. The frequency of occurrence may vary depending on factors such as maintenance, driving habits, and vehicle age.

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