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2019 Limited CVT
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43 Posts
Discussion Starter · #1 · (Edited)
Recently I noticed my '19 Limited is surging and bucking under light acceleration (around 1700 - 2000 RPM, give or take). For example, when I'm gently merging onto the interstate.

What happens is that the car feels as if I'm rapidly pulsing the accelerator hard, about 3-4 times per second. This surging / bucking always starts off weak and very quickly grows in intensity. After 2-3 seconds it's enough to make me think the CVT is going to tear itself apart! I can immediately fix the issue by letting off the accelerator.

Unfortunately this doesn't happen often so I can't find any cause or common conditions. All I know is it happens during light acceleration while the vehicle is already moving. So far this has not happened during urban driving, hard acceleration, or when applying power to get up a hill. I was consistently using Costco gas but after reading about a similar issue in an '06 that OP believed was linked to Costco gas, I switched to a variety of local convenience stores.

Anyone else experience this? Any thoughts?
 

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I've notice a very very slight surging when light acceleration with everything still cold. Nothing like you have described. It's only happened a few times under very light throttle. I just assume it's the CVT hunting up and down the ratios. Yours sounds much much worse. I wonder of this is all mechanical or some type of programming issue that could be improved on in the future. hrmmm
 

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2019 Limited CVT
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43 Posts
Discussion Starter · #3 ·
We've been in the 80s and low 90s here the past few months, so although the ambient temperature is relatively warm and the cold engine light is off, the vehicle has typically been running for 3-5 minutes when this happens. I'm not sure if that puts me in "cold engine" territory or not.

I also hope it's a programming issue that can be addressed.
 

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2019 Limited CVT
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Discussion Starter · #6 ·
I experienced this again today while driving up a gentle (about 3%) hill for several miles with cruise set at 70. The car felt as if someone was tapping the accelerator, or as if the A/C compressor was cycling several times per second (climate control was off).

Unlike past issues, I noticed the RPMs changing changing by about 200 even though my speed was constant. I understand that can happen with a CVT but there was no apparent cause. I boosted the cruise up to 75 and acceleration was smooth, but the issue returned once I hit 75. I then turned off cruise, let the speed drop to 65, manually accelerated up to 75, and set cruise again. Same issue.

This was the first time I was honestly concerned about losing the engine. The stuttering was really bad. The issue continued for about four minutes until I crested the hill, at which point it immediately stopped. It didn't return the rest of the trip.

Anecdotally, this seems to happen more with Kirkland Signature gas. When this occurred my tank was roughly 1/4 full with Sunoco. 87 as always. I know it's happened with other brands including Sheetz, Turkey Hill, and Speedway. I'm not convinced the gas is the issue, but I can't rule that out.

I'm posting this update in case anyone happens to have found a fix since my previous post.
 

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2019 Forester Premium Lineartronic® CVT
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511 Posts
I have the same thing happen occasionally. There are a few threads on the topic, though most of those are having this jerking while the CC is activated. That said, there is an ECM update available TSB 11-200-20R. You might give it a try. I am outside the warranty period to try this update, and do not have the issue frequently enough to warrant the cost.
 

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2017 XT Limited + Tech
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525 Posts
Perhaps try to use a scanner to see if there is any code. May use a fancier scanner that gives live data.
 
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