AutoCodes – Infiniti – P0734 Infiniti

P0734 Infiniti Code - 4th. 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 (4th) 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: P0734 Infiniti indicates 4th. 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.

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Code Popularity 11,008

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0734 Infiniti 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 (4th) 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 P0734 Infiniti - 4th. Gear Malfunction - AutoCodes.com — P0734 Infiniti Code - 4th. Gear Malfunction

What does this mean?

What are the Possible Causes of the DTC P0734 Infiniti?

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

How to Fix the DTC P0734 Infiniti?

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.

What does this mean?

Code Tech Notes

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0734 Infiniti 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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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 Infiniti Code

1. What are the common symptoms of OBDII code P0734 in an Infiniti?

- Common symptoms include harsh shifting between gears, delayed engagement when shifting into 4th gear, and the transmission slipping.

2. What does OBDII code P0734 in an Infiniti indicate?

- OBDII code P0734 indicates a malfunction specifically in the 4th gear of the transmission.

3. What are the possible causes of OBDII code P0734 in an Infiniti?

- Possible causes include low transmission fluid levels, a faulty transmission solenoid, a worn-out clutch, or internal transmission damage.

4. How can I diagnose the cause of OBDII code P0734 in my Infiniti?

- A thorough diagnostic scan, checking transmission fluid levels and condition, and inspecting for any visible signs of transmission damage are good starting points.

5. Is it safe to continue driving my Infiniti with OBDII code P0734?

- It is not recommended to continue driving your vehicle with this code as it can lead to further damage to the transmission.

6. Can I repair OBDII code P0734 in my Infiniti on my own?

- While some simple repairs like checking and topping up transmission fluid can be done at home, diagnosing and repairing internal transmission issues may require professional help.

7. How much does it typically cost to repair OBDII code P0734 in an Infiniti?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to a few thousand dollars, especially if parts need to be replaced.

8. Are there any preventive maintenance tips to avoid OBDII code P0734 in my Infiniti?

- Regularly checking and changing transmission fluid, addressing any transmission issues promptly, and driving gently can help prevent transmission malfunctions.

9. Can I clear the OBDII code P0734 in my Infiniti by disconnecting the battery?

- While disconnecting the battery may clear the code temporarily, it will not fix the underlying issue causing the malfunction in the 4th gear.

10. How urgent is it to address OBDII code P0734 in my Infiniti?

- It is recommended to address this code as soon as possible to prevent further damage to the transmission and ensure the safe operation of your vehicle.