So, you're here because you're probably experiencing some…let's call them "interesting" quirks with the transmission in your 2013 Infiniti JX35. You're not alone. The JX35, later rebranded as the QX60, is a popular luxury SUV, but its continuously variable transmission (CVT) has been a source of frustration for many owners. Let’s dive into what’s going on, why it’s happening, and what you can do about it.

Uh Oh, My JX35 Transmission Doesn't Feel Right – What's Going On?

The 2013 Infiniti JX35 is equipped with a Jatco JF016E CVT. While CVTs are designed for smooth, fuel-efficient operation, they can be prone to specific issues. The biggest problems with the JX35's CVT typically revolve around premature wear and tear, leading to a range of symptoms that can make driving a real headache. Here’s a breakdown of the most common culprits:

  • Shuddering and Hesitation: One of the first signs many owners notice is a shudder, especially during acceleration from a stop or at low speeds. It feels like the car is struggling to find the right gear, even though a CVT doesn't technically have gears. This shuddering is often accompanied by hesitation, where the car lags before responding to your foot on the accelerator.

  • Jerky Acceleration: Instead of the smooth, linear acceleration you'd expect from a CVT, you might experience jerky movements, almost like the transmission is slipping. This can be particularly noticeable when climbing hills or carrying a heavy load.

  • High RPMs with Low Power: The engine revs high, but the car doesn't accelerate as quickly as it should. This is a classic symptom of a slipping CVT belt. The CVT is essentially spinning without effectively transferring power to the wheels.

  • Transmission Slippage: This is a more severe symptom that indicates significant wear inside the CVT. You might notice the engine revving without any corresponding increase in speed, or the car might struggle to maintain its speed on inclines.

  • Limp Mode: In some cases, the transmission can enter "limp mode," which severely restricts the vehicle's speed and performance. This is a safety feature designed to prevent further damage to the transmission. A warning light, usually the check engine light or a transmission warning light, will illuminate on the dashboard.

  • Complete Transmission Failure: In the worst-case scenario, the transmission can fail completely, leaving you stranded. This usually happens after prolonged exposure to the other symptoms mentioned above.

Why is My JX35's CVT Acting Up? Understanding the Culprits

Several factors contribute to the transmission woes experienced by many 2013 Infiniti JX35 owners. Let's explore the main reasons:

  • Design Limitations of the Jatco JF016E: The Jatco JF016E CVT, while widely used in various Nissan and Infiniti models, has known design limitations, particularly regarding its ability to handle the torque output of the JX35's 3.5-liter V6 engine over the long term. The CVT’s belt and pulleys are particularly susceptible to wear under heavy load.

  • Overheating: CVTs are sensitive to heat. Towing heavy loads, driving aggressively, or even prolonged stop-and-go traffic can cause the transmission fluid to overheat. Overheated fluid loses its lubricating properties, accelerating wear and tear on internal components.

  • Infrequent Transmission Fluid Changes: Many manufacturers, including Nissan/Infiniti, initially marketed CVTs as having "lifetime" fluid. This is misleading. While the fluid might last the life of the transmission under ideal conditions (which rarely exist), regular fluid changes are crucial for maintaining its health. Neglecting fluid changes allows contaminants and metal particles to build up in the fluid, further accelerating wear.

  • Driving Habits: Aggressive driving habits, such as frequent hard acceleration and braking, put extra stress on the CVT, shortening its lifespan.

  • Towing: The JX35 is capable of towing, but exceeding the recommended towing capacity or towing frequently can significantly strain the CVT.

Okay, I Think I Have a Problem. What Should I Do Now?

If you suspect your 2013 Infiniti JX35 is experiencing transmission issues, here's a step-by-step guide on what to do:

  1. Get a Professional Diagnosis: The first step is to take your vehicle to a trusted mechanic or a dealership service center. They can perform a thorough inspection of the transmission, read any diagnostic trouble codes (DTCs) stored in the vehicle's computer, and accurately diagnose the problem. Don't rely solely on your own observations.

  2. Check the Transmission Fluid: A mechanic can check the condition and level of the transmission fluid. Dark, burnt-smelling fluid indicates that it's degraded and needs to be changed. Low fluid levels can also cause transmission problems.

  3. Consider a Transmission Fluid Change (If Appropriate): If the diagnosis indicates that the fluid is degraded, a transmission fluid change might help. However, it's important to note that a fluid change won't fix existing mechanical damage. In some cases, a fluid change on a very worn transmission can even exacerbate the problem. Consult with your mechanic to determine if a fluid change is the right course of action. Use only the Nissan CVT Fluid NS-3, which is the fluid specified for this transmission. Using the wrong fluid can cause irreversible damage.

  4. Explore Repair or Replacement Options: Depending on the severity of the problem, you might have several options:

    • Minor Repairs: If the problem is relatively minor, such as a faulty sensor or a leaking seal, a repair might be sufficient.
    • Valve Body Replacement: The valve body controls the flow of fluid within the transmission. A faulty valve body can cause shifting problems. Replacing the valve body can sometimes resolve these issues.
    • Transmission Rebuild: A transmission rebuild involves disassembling the transmission, replacing worn or damaged parts, and reassembling it. This is a more extensive and costly repair than a simple repair.
    • Transmission Replacement: In the most severe cases, the transmission might need to be replaced entirely. This is the most expensive option, but it guarantees a fresh start. You can opt for a new transmission from Nissan, a remanufactured transmission, or a used transmission. Be cautious when considering a used transmission, as its history and condition might be unknown.

  5. Get Multiple Quotes: Before committing to any repairs, get quotes from several different shops. This will help you ensure you're getting a fair price.

  6. Consider Extended Warranty Options: If you're planning to keep your JX35 for a long time, consider purchasing an extended warranty that covers the transmission. This can provide peace of mind and protect you from unexpected repair costs.

Preventing Future Problems: Taking Care of Your JX35's Transmission

While the 2013 Infiniti JX35's CVT has its challenges, there are steps you can take to minimize the risk of problems and extend its lifespan:

  • Regular Transmission Fluid Changes: Follow a more frequent transmission fluid change schedule than recommended by the manufacturer. Every 30,000 to 50,000 miles is a good guideline, especially if you do a lot of towing or aggressive driving.

  • Avoid Overheating: Be mindful of situations that can cause the transmission to overheat, such as towing heavy loads or driving in stop-and-go traffic. If you do tow, consider installing a transmission cooler to help keep the fluid temperature down.

  • Drive Conservatively: Avoid aggressive acceleration and braking. Smooth, gradual driving is much easier on the CVT.

  • Don't Ignore Warning Signs: If you notice any of the symptoms mentioned earlier, don't ignore them. Address them promptly to prevent further damage.

  • Proper Maintenance: Keep up with all recommended maintenance, including regular oil changes and other fluid checks.

Frequently Asked Questions About JX35 Transmission Issues

  • Is the 2013 Infiniti JX35 transmission reliable? The 2013 JX35's CVT has a reputation for being less reliable than traditional automatic transmissions, with a higher likelihood of experiencing problems. Regular maintenance and careful driving habits can help improve its longevity.

  • How much does it cost to replace a 2013 Infiniti JX35 transmission? The cost of replacing the transmission can vary widely depending on whether you opt for a new, remanufactured, or used unit, as well as labor costs, ranging from $3,000 to $6,000 or more. Getting quotes from multiple shops is recommended.

  • What fluid type is recommended for a 2013 Infiniti JX35 transmission? The only fluid recommended for the 2013 Infiniti JX35 transmission is Nissan CVT Fluid NS-3. Using any other fluid can cause serious damage to the transmission.

  • Can I tow with a 2013 Infiniti JX35? Yes, the JX35 is capable of towing, but it's crucial to adhere to the manufacturer's recommended towing capacity and take extra precautions to prevent transmission overheating, such as installing a transmission cooler.

  • Will a transmission fluid change fix my JX35's transmission problems? A transmission fluid change might help alleviate some minor issues, but it won't fix existing mechanical damage. It's best to consult with a mechanic to determine if a fluid change is appropriate for your specific situation.

The Bottom Line

The 2013 Infiniti JX35's CVT can be a source of headaches, but understanding the common issues, taking preventative measures, and addressing problems promptly can help you keep your SUV running smoothly. Remember, regular maintenance and a proactive approach are key to maximizing the lifespan of your JX35's transmission.