1.5l 6 Speed 1-2 hesitation and WOT slipping - Chevy Malibu Forum: Chevrolet Malibu Forums
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post #1 of 11 (permalink) Old 03-17-2019, 09:38 PM Thread Starter
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On my *2018* LS 1.5L 6 Speed with 27k miles I am getting a hesitation/jerking at the 1-2 shiftpoint. Sometimes this is just a short jerk/shudder, and other times it is up to a full second before power returns upon 2nd gear engaging. I also am getting what feels like slight slippage shudder at WOT at higher speeds. Also, and this is more rare, on long trips when going 50-60 mph, I get a very slight power surge lasting 1-2 seconds every 1-2 seconds (similar to what it would feel like to tow a trailer, which I have never done with this car). Before I take it in, is anyone else having these issues with the 1.5L 6-Speed LS or LT? Thanks!

Last edited by Briancjackson1.; 03-19-2019 at 04:58 AM. Reason: I have a 2018 model. I mistakenly said 2019.
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post #2 of 11 (permalink) Old 03-17-2019, 09:44 PM
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Re: 1.5l 6 Speed 1-2 hesitation and WOT slipping

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Originally Posted by Briancjackson1. View Post
On my 2019 LS 1.5L 6 Speed with 27k miles I am getting a hesitation/jerking at the 1-2 shiftpoint. Sometimes this is just a short jerk/shudder, and other times it is up to a full second before power returns upon 2nd gear engaging. I also am getting what feels like slight slippage shudder at WOT at higher speeds. Also, and this is more rare, on long trips when going 50-60 mph, I get a very slight power surge lasting 1-2 seconds every 1-2 seconds (similar to what it would feel like to tow a trailer, which I have never done with this car). Before I take it in, is anyone else having these issues with the 1.5L 6-Speed LS or LT? Thanks!
Take it to the dealer. Wouldn't be the first time I have heard of a tranny not having the proper level of fluid in it from the factory. Don't know if that's the issue, but nail them to the wall on warranty. Years ago, found on road dead, didn't fill the rear axles on some of their vehicles, so they had to put brand new axles in.

Last edited by Chevyman4life; 03-17-2019 at 09:46 PM.
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post #3 of 11 (permalink) Old 03-17-2019, 09:46 PM
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Re: 1.5l 6 Speed 1-2 hesitation and WOT slipping

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Originally Posted by Briancjackson1. View Post
On my 2019 LS 1.5L 6 Speed with 27k miles I am getting a hesitation/jerking at the 1-2 shiftpoint. Sometimes this is just a short jerk/shudder, and other times it is up to a full second before power returns upon 2nd gear engaging. I also am getting what feels like slight slippage shudder at WOT at higher speeds. Also, and this is more rare, on long trips when going 50-60 mph, I get a very slight power surge lasting 1-2 seconds every 1-2 seconds (similar to what it would feel like to tow a trailer, which I have never done with this car). Before I take it in, is anyone else having these issues with the 1.5L 6-Speed LS or LT? Thanks!
Doesn't this 2019 model have a CVT transmission, and not a 6 speed auto?

If so; let the CVT saga begin!

Edit: Earlier posts state you have a 2018 LS, this post states a 2019 model.
If indeed a 2018, it has a 6speed auto; 2019's with a 1.5 have a CVT.
I don't like hearing a 6 speed auto is having issues.

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Last edited by GarBec; 03-17-2019 at 09:58 PM. Reason: Questioning the model year: 2018 or 2019 Which transmission?
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post #4 of 11 (permalink) Old 03-18-2019, 09:18 AM
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Re: 1.5l 6 Speed 1-2 hesitation and WOT slipping

All 2019 Malibu models with the 1.5T engine have a CVT transmission that has fake shift points and gears. The only likely cause of the weird feeling (if anything is actually wrong) is the program controlling the pretend shifts.


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post #5 of 11 (permalink) Old 03-18-2019, 10:12 AM
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Re: 1.5l 6 Speed 1-2 hesitation and WOT slipping

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Originally Posted by cp-the-nerd View Post
All 2019 Malibu models with the 1.5T engine have a CVT transmission that has fake shift points and gears. The only likely cause of the weird feeling (if anything is actually wrong) is the program controlling the pretend shifts.
Actually, my first thought was that the CVT chain and/or pulleys are going bad.
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post #6 of 11 (permalink) Old 03-18-2019, 10:43 AM
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Re: 1.5l 6 Speed 1-2 hesitation and WOT slipping

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Actually, my first thought was that the CVT chain and/or pulleys are going bad.
My thoughts too, but earlier posts from the OP states he has a 2018 LS; which has a conventional auto 6 speed.
Here is his first post; From 9/8/18---

"I have a 2018 Malibu 1.5 LS with 14,000 miles. The Auto-Stop has worked flawlessly since I bought it new. Even on hot days here in Florida with the ac on it would still stop when it needed to. That..."

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post #7 of 11 (permalink) Old 03-18-2019, 12:25 PM
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I think GarBec is right, this is the 6-speed not a 2019 w/CVT. The 2019 must be a typo as the previous posts indicate 2018 and the last sentence of the first post of this thread confirms: "Before I take it in, is anyone else having these issues with the 1.5L 6-Speed LS or LT? Thanks!"
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Last edited by campb292; 03-18-2019 at 02:06 PM. Reason: Seriously? A typo in my own post suggesting a typo?
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post #8 of 11 (permalink) Old 03-19-2019, 05:03 AM Thread Starter
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I think GarBec is right, this is the 6-speed not a 2019 w/CVT. The 2019 must be a typo as the previous posts indicate 2018 and the last sentence of the first post of this thread confirms: "Before I take it in, is anyone else having these issues with the 1.5L 6-Speed LS or LT? Thanks!"
Sorry about that folks. I can’t believe I said 2019. I own a 2018 model. Manufactured in July 2017 in Kansas City Fairfax plant. NOT A CVT. definitely a 6 speed. Sorry about the confusion I caused earlier. I fixed my original post to say 2018. Anyway. Appreciate any advice. Thanks for the catch on the model year.
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post #9 of 11 (permalink) Old 03-19-2019, 06:15 AM
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Re: 1.5l 6 Speed 1-2 hesitation and WOT slipping

Thanks for clarifying... very different transmissions so advice will be different. I will side with @Chevyman4life's advice and suggest a dealership visit. Tell them you have been suddenly feeling some hard jerky shifts at low and high speed. It sounds like you have no warning lights or codes which is a bummer. If they say it is normal or cannot duplicate ask if they can at least verify the fluid level. It is also possible if they cannot find anything wrong and the fluid is at the proper level you could benefit from a fluid exchange. GM doesn't specify change until 45,000 miles under severe service (driving over 12,000/year qualifies) but at nearly 30k on the initial fluid it could help. I personally always change at 30, sometimes again at 60 and then never again.

As for general comments, the transmission is the same between the 2016-2018 models but programming seems to be different (at least on the ECM side) for the 2018 cars. Might help to have input from 2018 owners. I have a 2016. The 6T40 is a light duty unit that I find to be slow and lazy. I find the shifts between 1st and 2nd and 2nd and 3rd to be slow shifts but they aren't jerky, there is no flare, and no shudder. I feel a little shudder between 3 and 4 under light acceleration but every 6-speed gen9 I have driven behaves the same way on that shift. At 3/4-->WOT the shifts are all quick and smooth.

Good luck and hopefully some 2018 owners will chime in.
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post #10 of 11 (permalink) Old 04-01-2019, 06:26 AM
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Have you figured anything out with this issue. I just got a 2018 redline. Drove it from Maryland to Pennsylvania. It has 350 miles on it now. It’s doing the same thing. Really noticed it will going up a hill around 3000rpm. Felt like the power was surging but the rpm gauge was not showing the surge. Any help would be appreciated
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