The Continuously Variable Transmission (CVT) in 2013–2016 Nissan Altimas has been known to experience certain failures, primarily due to design and manufacturing issues. These failures can lead to a variety of symptoms, such as jerking, shuddering, slipping, or complete transmission failure. Below are the main reasons for these issues and potential solutions to fix them.

 
Common Reasons for CVT Failure
 

1. Overheating:

• The CVT might overheat due to insufficient cooling. This is often caused by inadequate fluid flow or defective transmission coolers. Overheating can lead to metal wear and eventual failure.

1. Fluid Contamination:

• Metal shavings and other contaminants can mix with the transmission fluid, resulting in poor lubrication and increased wear and tear on transmission components.

1. Software Issues:

• Faulty software can lead to incorrect transmission control, causing erratic shift patterns and stress on the transmission components.

1. Manufacturing Defects:

• Some Altimas from these years came with defective CVT components that were prone to premature wear or failure.

1. Inadequate Fluid Maintenance:

• If CVT fluid is not replaced according to the manufacturer's recommendations, it can cause breakdowns and reduced transmission performance.

 
Symptoms of CVT Problems
 

• Jerking or Shuddering:

• Often experienced during acceleration or shifting, indicating possible issues with fluid or internal wear.

• Slipping:

• When the engine revs but the vehicle does not accelerate proportionately, it suggests the transmission is slipping.

• Whining or Unusual Noises:

• High-pitched noises or new, unusual sounds could indicate internal CVT problems.

• Check Engine Light:

• This light may appear for a range of issues, including transmission problems, and necessitates a diagnostic scan.

• Complete Transmission Failure:
• The car may become immobile if the transmission completely fails.

 
Repair and Fix Strategies
 

1. Fluid Flush and Replacement:

• Regularly changing the CVT fluid according to Nissan's recommended schedule can help in maintaining the transmission's health. Using the correct type of fluid is crucial.

1. Install an Aftermarket Transmission Cooler:

• An aftermarket cooler can help mitigate overheating issues by enhancing the cooling capacity of your transmission, reducing the risk of overheating.

1. Software Updates:

• Ensuring the vehicle's software is up to date can fix certain shifting issues. Visiting a Nissan dealer might be necessary to receive any software updates.

1. Professional Diagnosis and Repairs:

• For severe issues, a professional diagnostic is vital to ascertain the specific problem and appropriate solution — whether it's rebuilding parts of the transmission or replacing it entirely.

1. Recall or Warranty Repair:

• Check if there are any recalls or extended warranties from Nissan covering CVT issues, which might cover some or all repair costs.

1. Replace CVT Transmission:

• In some cases, replacing the entire transmission might be the most viable solution, especially if there is extensive damage.

Regular maintenance and addressing issues promptly can mitigate these failures. Discussing with certified mechanics or dealerships familiar with Nissan CVT issues is advisable for continued vehicle health.