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Discussion Starter #1
I have a 2017 Toyota Sienna LE with the 6 cylinder 8 speed drive train. We are constantly getting a bump shift now and it is getting more constant when cold.
It happens when you first start off in the morning and when you come to a rolling stop, Another words your slowing down for a red light, the light turns green so you go to accelerate and wham .. it hits that shift hard and lurches forward. Just wondering what this could be. I am out of warentee by years (only 21K on the van). Is this software related?

Also is this normal behavior for this transmission? The last real stepped auto that I have had was back in 2005 (been purchasing hybrids since them or compact cars with CVT) and I never remember it acting like this
 

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Call Toyota Customer Care and open a case. There were several TSB's issued over a 2 year period for software updates and a set of VIN numbers (traceable to transmission builds that were truly bad) that qualify for replacement. There was a quiet extension of the warranty depending on the circumstances and severity of the issue. So while you are outside of the basic warranty, you probably still qualify for the powertrain (5 year / 60k miles) warranty and possibly even one of these extensions.

Do a search on the 'General' and the 'Problems' section of the Gen-III segment for links to some of the documents and details.
 

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Fibber thank you for your response. I will do that. I never got any other notice from Toyota so that is why I am concerned. I am wondering if the other crossovers with this combo are having issues also

I am kicking myself in the ass for not getting the 2016 with the older combo
 

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TSB's are notifications to the dealership shop that there is a known problem, and how to proceed with a repair. They aren't supposed to be seen by the likes of us (customers), but we have our ways! If you complain, they will act. If you keep quiet, they remain stone faced dumb on the issues.
 
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yeah it looks like I am going to have to raise holy hell in the dealer to get this thing fixed or I think I am going to trade it in .. I have not decided yet at this point.
I also see that the highlander uses the same power train. i wonder if this is across the board,
 

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I cross-posted some of the TSB's over on the ToyotaNation Highlander board, as the vehicles share much of the drivetrain. They were clobbered by it too (2017-2018).
 

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Discussion Starter #7
oh wow..... on going issue. man I wish they left this well enough alone with that tried and true 6 speed.
\
 

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I have a 2017 Toyota Sienna LE with the 6 cylinder 8 speed drive train. We are constantly getting a bump shift now and it is getting more constant when cold.
It happens when you first start off in the morning and when you come to a rolling stop, Another words your slowing down for a red light, the light turns green so you go to accelerate and wham .. it hits that shift hard and lurches forward. Just wondering what this could be. I am out of warentee by years (only 21K on the van). Is this software related?

Also is this normal behavior for this transmission? The last real stepped auto that I have had was back in 2005 (been purchasing hybrids since them or compact cars with CVT) and I never remember it acting like this
We have a 2018 LE with an 8-speed transmission.
I remember that the dealership did some ECU firmware update during one of the services and the shifting seems to have become a lot smoother. Maybe I'm just imagining it. We have only 10k miles on the van.
 

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Discussion Starter #10
Yeah we are making an appointment to get it looked at along with the annual New York State inspection process. There are really no other options out there from Toyota that are in our price range and we love the versatility of the mini van. Having a somewhat large family along with our elderly parents just enforces the need for the 7 to 8 seat Van/suv. Since the highlander uses this same transmission it would be a no go for us.

I would love to actually get some of the safety features also but I am not willing to pay almost 40k for it.
 

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Let us know how it goes. I'm up to 7k miles on my 2020 LE and running smoothly. Isn't this the same 8spd in the Lexus RX?
 

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Discussion Starter #12
I have called around my area to three different transmission shops. One flat out told me to take it to the dealer as they don’t service these transmissions due to the complexity of filling it up. One told me to bring it by And he will see if it is an electric issue. The third shop said I probably will need a new one and it’s close to 9000 to replace.
At this point I am taking it to the second shop next week to get a diagnosis along with some WS fluid as they also said it could be low
 

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Discussion Starter #15
Captain I am out of the 3 year, 36k warentee by years. I will see what the dealer will do for me but I doubt they will replace it. I will check with them though
 

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It should be covered under the Power train Warranty, which is 6 year / 60K miles. Bring the TSB numbers mentioned on my post. I used Fibbers TSB information as well. That's what I did. I came to them prepared with the TSBs. I said it lacked power during low gear acceleration.
 

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I may have to consolidate and repost some of the old info on UA80 8spd tranny issues for 2017/2018. If you follow some of the links mentioned above, you'll find several pointers.

Here's one:


Basic coverage is 5 yr / 60k miles. If you call Toyota and open a case, they will often extend coverage beyond this as there was so much bad press on these early transmissions.
 

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Discussion Starter #18
I definitely will open up a case with Toyota on this one. It happened to us again.. sluggish off the line, funny shifting when cold.
my father and I took it for a quick toot for a couple of miles just now. I hooked up an Autel and monitored the trans temp. when we are done it was at 199.98 degrees F. It will go in this coming weekend and if we are not satisfied with the outcome my wife and I will raise hell with Toyota. It’s just not right with this god awful UA80. We shall see what happens.
 

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Discussion Starter #19
update: Van will be going into toyota dealer next week to address the problems. I will post an update as to what they say. thank you all for all your help
 

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Cool! I was a bit concerned when they told me I needed a new transmission on a vehicle I owned for less than a week. But so far, 2000 miles later, no trouble.
 
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