What Causes Jerking in CVT Transmissions?
3 Answers
Here are the reasons for jerking in CVT transmissions: 1. Insufficient Lubrication: A common cause of jerking in CVT transmissions is gear-shift jerking during cold starts. Since most mainstream CVT transmissions require fluid, insufficient lubrication during cold starts can lead to poor chain connections. When the clutch engages during a cold start, it is prone to impact, causing gear-shift jerking. This issue can be avoided by warming up the car and ensuring the brake is firmly pressed during gear shifts to allow smooth clutch engagement. 2. Design and Quality Issues: Design and quality problems can also frequently cause shaking in CVT transmissions. A typical example involves a certain Japanese brand. The CVT failures in this brand are mainly due to poor torque converter design (connecting the transmission body to the engine), leading to gear-shift impacts that can occur at any speed. Additionally, subpar quality, excessive chain wear beyond normal levels, and a large amount of metal shavings accumulating in the oil pan can also cause shaking in CVT transmissions, though severe jerking is unlikely.
I've been driving a CVT car for over a decade, and the common cause of jerking is transmission fluid issues. Aged or insufficient fluid reduces lubrication effectiveness, causing internal chain slippage and body jerking during acceleration. Faulty hydraulic control units are also frequent culprits, where unstable pressure leads to rough gear shifts. Daily driving requires attention to temperature, as prolonged high-temperature operation deteriorates fluid quality. Maintenance advice suggests changing the specialized fluid every 40,000 kilometers and checking if the fluid level is at the midpoint of the dipstick. Ignoring these issues may accelerate drive belt wear, double repair costs, and compromise driving safety, especially during mountain driving or highway overtaking. My experience shows that regular maintenance significantly extends transmission lifespan and prevents unexpected failures.
As a driver who frequently transports family members, I've noticed that many CVT jerks are caused by driving habits. Frequent sudden acceleration or braking can lead to chain overheating and tension changes, resulting in jerks. Additionally, oil pump failure is another root cause, as insufficient oil pressure disrupts RPM matching. Urban congested areas are the most prone to issues, so I've learned to press the throttle smoothly to reduce strain. Checking the fluid color is crucial—if it appears dark, it's time for a change. For prevention, ensure a one-minute warm-up after a cold start before driving to minimize wear. This not only saves money but also makes the ride smoother, reducing the unease of sudden jolts. Regular maintenance is key—don't wait for major problems to arise before fixing them.
