A New GT-R Owner’s Guide to Ensuring GR6 Transmission Reliability
Introduction:
Congratulations on your new (to you) R35 Nissan GT-R! Known for its raw power, iconic design, and groundbreaking all-wheel-drive system, the GT-R is a supercar that redefined performance. At the heart of this marvel lies the GR6 dual-clutch transmission, an engineering masterpiece that demands attention to ensure reliability and performance, especially in used models.
Whether you're a new owner of a CBA model (2009-2011) or a DBA model (2012-2016), understanding your transmission is crucial for a worry-free ownership experience. In this guide, we’ll explore what to inspect, common weak points, and essential upgrades to keep your GR6 running at its best.
1. Understand the GR6 Transmission Basics
The GR6 dual-clutch transmission (DCT) is a sophisticated piece of technology that offers lightning-fast shifts and incredible power transfer. However, it’s also a high-maintenance system, particularly in used vehicles where unknown service history or modifications could introduce wear.
Key Features of the GR6:
Six-speed dual-clutch design.
Integrated with ATTESA AWD system.
Engineered to handle high-performance demands but sensitive to neglect.
2. Common Weak Points in Early CBA Models
For owners of 2009-2011 GT-Rs, known as the CBA models, there are several inherent weak points in the GR6 transmission. It’s not a matter of if, but when these issues will arise. Addressing these proactively is essential to avoid costly repairs.
Pressure Sensors:
The pressure sensors in the GR6 are notorious for failing in early models. Over time, they may begin reading incorrectly, causing transmission faults and, ultimately, leaving the car in limp mode. Testing the sensors regularly is critical to catching issues before they lead to failure.
Solenoids:
Alongside the pressure sensors, the solenoids in the transmission should also be tested to ensure they remain within specification. Faulty solenoids can contribute to transmission errors and performance degradation.
Clutch Seals:
Clutch seals in CBA models are prone to tearing or failing. This prevents the clutch from maintaining the pressure needed to engage properly, leading to slipping and eventual damage to the clutch frictions or steels. If left unchecked, this can cause extensive wear and require a full rebuild.
Gear Selector Rings:
The gear selector rings in early models have a design flaw that can lead to synchronizer or hub damage. Although this is the least common failure, it can result in costly full gearbox rebuilds. When we build transmissions in-house, we upgrade these components to eliminate this weakness and extend the lifespan of the transmission.
DBA Model Improvements:
Many of these issues were resolved in the DBA models (2012-2016), which feature improved pressure sensors, clutch seals, and gear selector designs. However, CBA owners should remain vigilant about these weak points.
For expert help addressing these issues, check out our GR6 Transmission Rebuild Services.
3. Inspect Service Records and Transmission Data
Why It’s Crucial:
The first step in evaluating your GR6 transmission is to review both the service history and the internal data stored within the transmission. These details provide valuable insights into how the transmission has been used and maintained, offering indicators of its current condition and potential wear.
What to Look For:
Fluid and Filter Service Intervals:
Check if the transmission fluid and filters have been serviced every 15,000 to 18,000 miles. Regular fluid changes are critical for lubricating components, maintaining proper temperatures, and preventing premature wear.High-Temperature Reports:
Transmission temperature data reveals whether the gearbox has been overheated during previous use. Frequent high-temperature readings can indicate stress on internal components, requiring closer inspection.Launch Count:
The GR6 stores data on how many times the vehicle has been launched. A high launch count suggests aggressive use, which can accelerate wear on clutches, seals, and gears.Clutch Pressure and Preload Settings:
Reviewing clutch pressure and preload values can reveal how well the transmission is functioning. Deviations from optimal settings may indicate worn parts or improper tuning, helping predict when a rebuild or component replacement might be necessary.
Why It Matters:
These data points not only provide a window into the transmission’s history but also help assess whether the vehicle was cared for properly. Vehicles with inconsistent fluid service intervals, frequent high temperatures, excessive launches, or off-spec clutch settings are more likely to require immediate attention or upgrades.
4. Diagnostic Checks for New Owners
Proper diagnostics are essential for assessing the health of your GR6 transmission and catching potential issues early. Whether you’ve just purchased your GT-R or are maintaining it regularly, having the right tools and knowledge can save you from costly repairs down the road.
Importance of Reading Diagnostic Codes
One of the most critical tools for any GT-R owner is the ability to read and clear transmission diagnostic codes. We recommend using ECUTek’s software and dongle, a reliable and user-friendly solution that allows you to monitor your transmission’s health.
Immediate Insights:
Diagnostic codes can provide invaluable information about what’s happening inside your GR6, even if you’re not experiencing noticeable issues.Remote Support:
Even if you’re unsure what the diagnostic fault means, ECUTek enables you to share the data with your transmission shop of choice (hopefully Colab Garage!) for expert advice and resolution.On-the-Go Convenience:
Keep the ECUTek dongle in your car at all times, so you’re always prepared to identify and address issues if they arise.
Testing the AWD Clutch System (ETS)
One of the most common issues with the GR6 transmission is related to the AWD clutch system, also known as the ETS unit. This system is crucial for proper all-wheel-drive functionality and can exhibit symptoms that are easy to test for at home. Regular checks can help identify problems early, preventing more significant damage.
Reverse Test:
On a flat surface, put the car in reverse and turn the steering wheel fully to one direction. If the car struggles to creep backward, your ETS unit likely needs servicing.Sharp Turn Noise Test:
Listen for popping or clunking noises during sharp, slow turns. These sounds often indicate issues with the ETS unit that require attention.
A malfunctioning ETS system can affect drivability and performance, especially in high-torque or spirited driving scenarios. Addressing these issues early ensures your AWD system operates as intended and prevents wear on other drivetrain components.
If your tests reveal an issue with your AWD clutch system, don’t wait—have it inspected and serviced by experts. At Colab Garage, ETS rebuilds are one of our most common and trusted services. Learn more about our ETS rebuild service.
Proactive Maintenance with Diagnostics
In addition to reading diagnostic codes, performing a clutch and gear learning procedure during fluid and filter maintenance is an excellent practice. Even if your transmission seems to be operating correctly, this procedure can reveal hidden wear or misalignment.
Failed Learning Procedure:
If your GR6 cannot complete the learning process, it’s a clear indication that something is worn or out of spec. Addressing these issues early can prevent costly failures down the line.
What to Include in Diagnostics:
Error Codes: Scan for stored codes indicating transmission faults.
High-Temperature Logs: Check for frequent overheating events.
Clutch Life and Gear Learn Status: Use ECUTek to run learning procedures and evaluate clutch engagement health.
The Bottom Line:
Investing in ECUTek’s diagnostic tools and performing regular ETS system checks are musts for any GT-R owner. These steps empower you to understand your transmission’s health, share detailed data with your shop, and take proactive steps to ensure your GR6 performs at its best.
Want to learn more about our diagnostic tools and services? Visit our GR6 Transmission Diagnostics Page
5. Upgrades for Long-Term Reliability
Upgrading your GR6 transmission with the right components and systems ensures it can handle your driving style and performance goals while maintaining reliability. However, not every upgrade is necessary for every owner, so understanding your needs is critical.
Cooling Solutions:
Keeping transmission temperatures in check is vital for long-term reliability, but whether you need a cooling upgrade depends on how you use your GT-R.
When Cooling is Essential:
If you’re a weekend track warrior or enjoy spirited mountain drives, a transmission cooler is crucial to keep fluid temperatures below the recommended threshold of 240°F.
When It’s Optional:
For straight-line racers or daily drivers who only occasionally push their GT-R, a cooling upgrade may not be necessary, as transmission temps rarely reach dangerous levels in these scenarios.
There are many proven cooling solutions available on the market, with HKS, Greddy, and Dodson Motorsport offering some of the most popular options.
For more details about Dodson Motorsport components and how they benefit the GR6, check out our comprehensive GR6 transmission blog post.
TCU Tuning:
If you’ve made any upgrades or replaced parts in your GR6 transmission, Transmission Control Unit (TCU) tuning is essential to optimize its performance.
Why It Matters:
A properly tuned TCU ensures smooth shifting, precise clutch engagement, and optimal power handling, significantly enhancing both drivability and long-term reliability.
Choosing the Right Tuner:
Selecting an experienced tuner is critical. Your tuner will play a major role in how your transmission adapts to upgrades, so it’s important to identify who you’ll work with before or during the upgrade process. A great tuner ensures your GR6 performs flawlessly and avoids unnecessary wear.
Conclusion:
Owning an R35 GT-R is a thrilling experience, and with proper care, the GR6 transmission will provide exceptional performance for years to come. For CBA model owners, proactively addressing weak points is key to a worry-free ownership experience, while DBA model owners can enjoy enhanced reliability with regular maintenance and strategic upgrades.
If you’re looking to rebuild, upgrade, or maintain your GR6 transmission, Colab Garage has you covered. From diagnostics and service to complete transmission packages, we offer tailored solutions for every R35 GT-R owner.
Explore our GR6 Transmission Packages today or contact us for personalized advice. Let’s keep your GT-R performing at its peak!
