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Discussion Starter #1
So, I've been experiencing something that to my surprise I can't seem to find anywhere in the manual or on this forum.

When it's hot hot outside 90+ we get very sluggish performance out of our transmission shifts. I don't mean slight differences....I mean full on driving a fully loaded semi truck up a hill performance. It seems to do whatever it can to keep the revs as low as possible. If you really, really force the pedal down it will eventually relent and give you a downshift but it will quickly go back to low rpms asap.

I somewhat expect this is a coping mechanism for the heat bit it drives like a totally different vehicle in these temps.

Anyone noticed this or do we have an issue that needs to be looked at?
 

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So, I've been experiencing something that to my surprise I can't seem to find anywhere in the manual or on this forum.

When it's hot hot outside 90+ we get very sluggish performance out of our transmission shifts. I don't mean slight differences....I mean full on driving a fully loaded semi truck up a hill performance. It seems to do whatever it can to keep the revs as low as possible. If you really, really force the pedal down it will eventually relent and give you a downshift but it will quickly go back to low rpms asap.

I somewhat expect this is a coping mechanism for the heat bit it drives like a totally different vehicle in these temps.

Anyone noticed this or do we have an issue that needs to be looked at?
Welcome to the forum. A little more info about your van would be helpful. If you put your van info (year, trim, gas/hybrid, etc.) in the signature line of the UserCP it will show up at the bottom of all your posts. Year and build date (on edge of driver's door) would help since there were some transmission updates early on. Does this happen more when you are using cruise control?

I haven't noticed a shifting issue related to the heat.
 

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Yep, my bad. It's a 17 Limited (without ESS). The only thing to add is that when this happens the engine temp never goes above 208 but can dip as low as 185 when up to speed. So it's not like it's curbing the output because the engine is overheating.
 

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Yep, my bad. It's a 17 Limited (without ESS). The only thing to add is that when this happens the engine temp never goes above 208 but can dip as low as 185 when up to speed. So it's not like it's curbing the output because the engine is overheating.
Have you had your van in for any software updates? It seems like my van had a few software updates.
Have you had any transmission updates done on your van? My van is also non ESS and had this technical service bulletin done which seemed to help most shifting issues. A TSB isn't the same as a recall so they aren't going to update software unless you say that there is a problem. There may be newer updates, so it is probably best to take the info along and ask the dealer if there are newer updates also. The malfunction light didn't come on for this issue in my van.
https://www.pacificaforums.com/forum/356586-post2.html
 
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