How do you diagnose a CVT transmission?
A continuously variable transmission (CVT) is a type of automatic transmission that provides a seamless and efficient power delivery by using a belt or chain system to continuously vary the gear ratio. Diagnosing a CVT transmission can be a bit more complex than a traditional automatic transmission, but there are several key signs and symptoms to look for.
Common CVT Transmission Issues
Some of the most common problems that can occur with a CVT transmission include:
- Slipping or Jerking: If the CVT is slipping or jerking during acceleration, it could indicate a problem with the belt, pulleys, or other internal components.
- Whining or Grinding Noises: Strange noises coming from the transmission may signal an issue with the bearings, gears, or other moving parts.
- Delayed or Erratic Shifting: If the transmission is slow to respond or shifts unexpectedly, it could be a sign of a control system or sensor problem.
- Overheating: Excessive heat buildup in the CVT can lead to premature wear and failure of the components.
- Leaks: Fluid leaks around the transmission housing or connections may indicate a seal or gasket issue.
These symptoms can help point to the root cause of the CVT problem, but a thorough diagnostic process is usually required to pinpoint the exact issue.
Diagnosing a CVT Transmission
Diagnosing a CVT transmission typically involves the following steps:
- Perform a Visual Inspection: Check for any obvious signs of damage, leaks, or wear on the external components of the transmission.
- Check Fluid Level and Condition: Ensure the CVT fluid is at the proper level and has not become contaminated or degraded.
- Scan for Diagnostic Trouble Codes: Use an OBD-II scanner to read any diagnostic trouble codes that may be stored in the vehicle's computer system.
- Conduct a Road Test: Drive the vehicle to replicate the symptoms and observe the transmission's behavior under various driving conditions.
- Perform Specialized Tests: Depending on the findings, additional tests may be required, such as pressure checks, component inspections, or transmission fluid analysis.
By following this systematic approach, a skilled technician can often identify the root cause of the CVT transmission issue and recommend the appropriate repair or replacement solution.
How to check used CVT transmission?
CVT in a Used Car
Take the car out on a long stretch of road and test it at a speed over 60 MPH. If you notice any shaking or bucking, this may be a sign of transmission malfunction.
What happens when a CVT fails?
CVT Problems
Transmission overheating. Loud whining and other transmission noises. Delayed acceleration/engine revving/transmission slipping. Vehicle jerking, shuddering, or shaking.
Can a CVT transmission be fixed?
It is possible to repair CVT units from certain manufacturers, but for the most part, a failing CVT means replacing the transmission. Remanufactured units are available for many OEM manufacturers, and dealer units are often available in cases where there are no aftermarket options.
What does a failing CVT sound like?
In a CVT transmission, whining is one of the most common signs that the transmission is beginning to have internal issues. Rather than using a traditional gear system, a CVT transmission will often use pulleys and a belt to allow constant ratio changes.
What is the biggest problem with CVT transmissions?
CVTs can be expensive to repair or replace when compared to a conventional automatic transmission. Some of the common problems that owners run into include overheating, slipping, and sudden loss of acceleration. Shuddering is also a common problem.
What year CVT transmission is bad?
Nissan CVT Problems Overview
Owners of Nissan vehicles, model years between 2013 and 2020, have filed complaints with the National Highway Traffic Safety Administration (NHTSA) claiming that their vehicles have been affected by CVT transmission defects.
How much does it cost to replace a CVT transmission?
$3,000 to $8,000
On average, the cost of a new CVT transmission can range from $3,000 to $8,000, including parts and labor. If your vehicle experiences transmission issues while under warranty, the cost of a new transmission should be included.
How do I tell if my CVT transmission is bad?
CVT Common Problems
- Transmission 'jerking', slipping, grinding or jumping during acceleration when the car is shifting gears.
- Noisy while driving – some customers have issues with a 'whining', 'clanging' or 'rattling' sound while driving especially with Nissan CVT's.
- Contaminated or low transmission fluid.
- Overheating.
How is CVT diagnosed?
Radiological diagnosis of CVT
In most acute hospitals, computerised tomography (CT) of the brain is widely available and is the most common initial imaging used in acute stroke presentations. Subacute ischaemia and acute haemorrhage (parenchymal or subarachnoid) are readily identified by CT imaging (Fig 1a,b).
How to test for CVT?
MRI with contrast (MRV) appears to be the most accurate test for diagnosing CVT.
