What causes CVT transmission slippage?
2 Answers
Stopping to rest for 20 minutes usually means the transmission has entered protection mode, likely due to overheating. The transmission needs to cool down before exiting protection mode. Additional extended information is as follows: 1. Overview: The transmission is a device that changes the speed ratio and direction of motion, typically located between the clutch and the central drive. It can alter the torque, speed, and direction of motion transmitted from the driving shaft to the driven shaft according to different working conditions. Gear-driven transmissions generally consist of a housing and several gears. 2. Classification: Automatic transmissions have become mainstream internationally, mainly including AT, AMT, CVT, and DCT types. Early AT transmission systems were primarily 4AT. AT achieves automatic shifting through an electronically controlled automatic operating system. CVT is a true continuously variable transmission with fewer parts and a smaller size. DCT has two clutches.
CVT transmission slippage is quite common, and I've encountered this issue many times. Generally, slippage occurs due to wear or loosening of the transmission steel belt or chain, which results in insufficient power transfer. Problems with the hydraulic system, such as low oil pressure, can also cause issues—if the pump is aging or the filter screen is clogged, shifting becomes problematic. Transmission fluid is another critical factor; if the fluid is dirty, low, or degraded, the lubrication effect diminishes, leading to poor gear operation, ranging from jerky shifts to outright slippage. A faulty control module can also be the culprit, sending incorrect commands that result in inaccurate shifting. Symptoms include a rapid increase in RPM during acceleration without a corresponding rise in speed, and in severe cases, unusual noises. If you notice these signs, don't push it—stop and check the fluid level and color. A light brown color is normal, but if it's dark or has a burnt smell, immediate action is needed. Regular maintenance is crucial; changing the fluid every two years can significantly prevent this issue.
