P0734 2002 Nissan Altima Sedan 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 2002 Nissan Altima Sedan 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.
Code P0734 2002 Nissan Altima Sedan 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 (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.
What are the Possible Causes of the DTC P0734 2002 Nissan Altima Sedan?
- Low transmission fluid level
- Dirty transmission fluid
- Shift solenoids
- Transmission mechanical problems
- Transmission hydraulic control circuit
How to Fix the DTC P0734 2002 Nissan Altima Sedan?
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
There is a Factory Service Bulletin for the 2002 Nissan Altima:
2002 Nissan Altima Factory Service Bulletin OBDII Code P0734
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0734 2002 Nissan Altima Sedan 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.
Need more information about the P0734 2002 Nissan Altima Sedan code?
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Need Help with the Code?
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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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