By Ezra Lane If your Nissan displays a P0734 code, it indicates an incorrect fourth gear ratio, signaling issues such as slipping gears or harsh gear transitions. This mismatch arises primarily from low or dirty transmission fluid, faulty shift solenoids, or internal wear. Begin diagnostics by checking the transmission fluid's level and cleanliness, followed by an inspection of the shift solenoids and electrical connectors for any signs of damage or wear. These steps are critical in preventing further transmission damage and ensuring the longevity of the vehicle. Should you encounter persistent issues, a thorough review by a professional could reveal deeper insights.
P0734 Nissan Code Meaning
The P0734 code in a Nissan means the fourth gear ratio doesn't match the Transmission Control Module's expectations.
Causes include low/dirty transmission fluid, faulty shift solenoids, or mechanical wear.
Check fluid first; if unresolved, inspect solenoids, transmission components, and electrical connections.
Error Code P0734 Symptoms
When your Nissan shows the P0734 error code, it means there's a problem with the fourth gear. You'll see the check engine light come on, and the car might act differently.
Here's what to watch for:
- Shifting Issues: The car might've trouble getting into fourth gear. It may skip fourth gear and go straight to a higher one. This can make driving feel rough or jerky.
- Worse Gas Mileage: The car won't use fuel efficiently because the gears aren't working smoothly.
- Limp Mode: In bad cases, the car might switch to limp mode. This means it will slow down to protect the transmission.
You might also hear strange noises like grinding or whining from the car. These sounds mean the transmission parts mightn't be working right.
If you notice these signs, get it checked out to prevent further damage.
Causes of Nissan P0734 Fault Code
If your Nissan is showing a P0734 code, it means there's an issue with the fourth gear. The Transmission Control Module (TCM) is responsible for monitoring this.
Here are some common reasons why this might happen:
- Low or Dirty Transmission Fluid: Your car needs clean and enough transmission fluid to work properly. If the fluid is dirty or too low, it can affect the pressure and how well the gears shift, causing problems like the P0734 code.
- Bad Shift Solenoids: These parts control how the transmission fluid flows, allowing the gears to shift as they should. When they don't work right, the TCM can't manage the gear changes properly, which might cause this error code.
- Wear and Tear: Over time, the parts inside your transmission can get worn out. This can include damaged gears, which can lead to the TCM detecting the wrong gear ratios.
Additionally, if there are issues with the wiring or connectors in the transmission hydraulic control circuit, it can mess with the TCM's ability to control the gears properly.
Identifying the exact problem is crucial to fixing the P0734 error.
Tools Needed to Diagnose
To diagnose the P0734 Nissan code, you'll need some specific tools. These help you pinpoint problems and keep your car's transmission in good shape.
Here's what you'll need:
- OBD-II Scanner: This tool reads and clears error codes from your car's computer, showing you what might be wrong.
- Multimeter: Use this to check the wiring. It helps ensure the transmission control module and shift solenoids work well.
- Transmission Fluid Pressure Gauge: This helps you see if the fluid pressure in the system is right. Incorrect pressure can indicate mechanical problems.
Also, have a mechanic's tool set ready. It includes wrenches, sockets, and screwdrivers for checks or small fixes.
A transmission fluid dipstick or funnel is useful too. Checking the fluid level and its condition is key since low or dirty fluid can cause gear ratio problems.
With these tools, you're set to address the P0734 error code.
How to Fix P0734 Nissan Error Code – Step by Step
Step 1:
Begin by checking the transmission fluid level and condition. If the fluid is low or appears dirty, replace it with fresh fluid to avoid triggering the P0734 error code.
Step 2:
Examine the wiring harness and connectors for any signs of damage, corrosion, or loose connections. Address any issues found, as these can disrupt the vehicle's communication system and cause the error code.
Step 3:
Test the shift solenoids, as these components are crucial for proper gear shifting. If they're found to be malfunctioning, replacing them may resolve the P0734 error.
Step 4:
If the problem persists, it may be due to internal transmission mechanical issues or problems in the hydraulic control circuit. These issues require more complex diagnostics and repairs.
Step 5:
Consult a professional if previous steps don't resolve the issue. Professional diagnosis typically costs between $75 to $150 per hour, but is essential to ensure accurate repairs and prevent further damage to your Nissan.
Common Diagnosis Mistakes
Don't jump into complex diagnostics right away when you get the P0734 Nissan code. Start by looking at simple things first.
- Transmission Fluid Levels and Quality: Check if the transmission fluid is low or dirty. If the fluid isn't right, it can mess up gear shifting and cause the P0734 code.
- Shift Solenoids Inspection: Look at the shift solenoids. These parts help the gears work right. If they aren't working, you might see problems with gear ratios.
- Wiring and Connectors: Check the wiring and connectors for any damage or rust. Electrical problems can affect how the transmission works and make you think there are bigger problems.
If you don't understand symptoms like the check engine light and transmission acting weird, you might try fixing things that aren't broken.
Don't forget to check the hydraulic control circuit, as it might've issues you need to fix. Use a step-by-step approach to find out what's wrong.
P0734 Nissan Repair Cost
Fixing the P0734 code on a Nissan can cost different amounts. It mostly depends on the labor fees in your area and how tricky the issue is.
Usually, you might pay between $75 to $150 for each hour of work. Diagnosing and fixing this problem typically takes about one hour, but more complex issues could take longer and cost more.
Several things can affect the total cost. These include your car's model and engine type. If it turns out that the transmission fluid needs to be changed or topped up, or if parts like shift solenoids or hydraulic components need replacing, your expenses will increase.
A simple fluid change mightn't add much to the bill, but replacing major parts can be expensive.
It's a good idea to get a professional check to know exactly what needs fixing and avoid spending extra on unnecessary parts.
Related Error Codes on Nissan
If you see error P0734 on your Nissan, you might also find codes like P0731, P0732, and P0733. These codes relate to problems with your car's transmission, specifically with gear ratios. It's a sign that there might be a bigger issue with the transmission that needs a quick check.
To figure out what's wrong, check the transmission fluid and shift solenoids. Low or dirty fluid can mess up how the gears work, leading to multiple error codes. Bad solenoids can also cause trouble with gear changes, making the transmission act up.
Here's a quick look at each code:
| Code | Gear | Problem Type |
|---|---|---|
| P0731 | 1st | Gear Ratio Problem |
| P0732 | 2nd | Gear Ratio Problem |
| P0733 | 3rd | Gear Ratio Problem |
| P0734 | 4th | Incorrect Gear Ratio |
Don't ignore these codes. They could lead to more serious transmission issues. It's a good idea to see a professional for a solid diagnosis and the right repairs.
Can I drive safely with P0734 Nissan?
No, it's not safe to drive your Nissan with a P0734 code.
This means there's a problem with the transmission's fourth gear. It can cause unsafe driving like slipping gears.
Drive slowly to a mechanic to fix it and avoid more damage.
People Also Ask
Does Altitude Affect the P0734 Nissan Error Code Occurrence?
Yes, high places can make your car act different. The air is thinner, which means the engine might not work as strong. This can confuse the car's transmission and cause a P0734 error, which means it's having trouble with gear changes.
Can Software Updates Prevent the P0734 Error in Nissans?
Software updates can help stop the P0734 error in Nissans. These updates make the car's computer smarter, so it shifts gears better. It's a good idea to ask your Nissan dealer about the latest updates.
How Does Weather Impact the P0734 Transmission Error?
Weather can cause transmission problems like the P0734 error. In hot or cold weather, the fluid in the transmission becomes too thick or too thin, making it hard for gears to work properly. This can lead to errors when driving.
Does P0734 Nissan Code Affect Fuel Economy?
Yes, the P0734 Nissan code affects fuel economy. When your car has trouble with gear ratios, the engine works harder and uses more fuel. This means you will need to fill up your gas tank more often because your car isn't running as efficiently.
Is There a Recall Associated With the P0734 Nissan Code?
To see if your Nissan has a recall for the P0734 code, which means a transmission issue, visit the NHTSA website and enter your car's VIN. You can also call a Nissan dealership for help. They can tell you if there's a recall.