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4l80e Trouble?

hotbread597

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hotbread597 Enthusiast

hotbread597

Posted
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I have a 2006 GMC Sierra 2500HD 4x4 6.0L with a 4L80E tranny, and it has about 50000km's on it. I have noticed recently that sometimes I drop the truck in drive and you hear it settle into gear and then as soon as a touch the throttle nothing happens and the rpms climb to about 1500 and then it kinda jumps and goes forward almost like the tranny is slipping? Has anybody else had this problem as well. I still have a factory warranty so im wondering if i need a tranny, and how i would make it do it all the time because right now the problem only occurs every week if that. Thanks.

  • 2 weeks later...
Riverjet502 Enthusiast

Riverjet502

Posted
Posted

Sounds like a check ball (acts like a check valve) is leaking oil bye. I bet once the engine is running for say 15-20 sec's and the tranny's pump is spinning, oil pressure builds and the tranny works normal?

builderpaul Enthusiast

builderpaul

Posted
Posted
My 2001 HD did the same thing at 49,000 miles. Over time, it will get worse. I ended up getting a new tranny.

 

The first start of the day truck will not move for a few seconds till pressure builds. If I don't use it for a day or two it takes longer to move. Once it moves all is fine. Been that way since 25000miles. (42000 now) I have just learned to let it idle for a few seconds before shifting. Doesn't seem to be getting any worst but if it is an easy fix I would do it.

ATMINF Enthusiast

ATMINF

Posted
Posted

Have you ever gotten it to a dealer to look at before the warrenty ran out? If the problem started at 25K I was thinking you might have gotten it look at. If so the problem maybe "grandfathered" and GM will fix the trans for you. Also you can always take it to a dealer and tell them whats up, and how long its been occuring and maybe they will help ou out. Not all dealers are bad, alot do what they can to help out. Good luck.

hotbread597 Enthusiast

hotbread597

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I talked to the dealer and they told me that unless it does it all the time, they will not be able to diagnose the problem, and mine will do it even after i have let it idle for a couple minutes in park and letting it site in d for about 15 seconds but it only does it every now and then, I only have 8000km's left on my warranty, so basically the dealer won't do jack cause they can't find the problem

ATMINF Enthusiast

ATMINF

Posted
Posted

Can you go to another Chevy or GMC dealer? Call ahead to the service manager and tell them whats up. If that fails call the areas GM service rep and tell them what is going on. Alot of times if you are forceful enough, or you get a cool dealer and service rep they will note the issue and basically extend your warranty. So if it does go bad later you are usually covered. I have heard or guys getting their engine/trans covered for up to 100,000 miles(this was prior to the 2007+ 100,000 coverage). I would basically call around and get a hold of a GM rep explain as best you can, being firm but polite and get them to fix it. To get a TRANS fixed is not cheap. Good luck!

minibike132 Senior Enthusiast

minibike132

Posted
Posted

Has a ticket actually been written or are you telling them the problem and they say they can't do jack and show you the door? There really isn't a whole lot to do unless we can duplicate the condition, that much is true. However if you have a hard failure after the warranty expires you will have a much easier time convincing GM of a goodwill repair or at least some help if the complaint was documented before the warranty is up.

builderpaul Enthusiast

builderpaul

Posted
Posted
Has a ticket actually been written or are you telling them the problem and they say they can't do jack and show you the door? There really isn't a whole lot to do unless we can duplicate the condition, that much is true. However if you have a hard failure after the warranty expires you will have a much easier time convincing GM of a goodwill repair or at least some help if the complaint was documented before the warranty is up.

 

 

That is my problem. The old can't duplicate the problem. I would need to leave the truck overnight ( a few nights would be better) so they can start it after sitting. Can't be without the truck. (works every day). It is a minor anoyance now I have learned to just let it idle before I attempt to drive.

hotbread597 Enthusiast

hotbread597

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I have taken in my truck, got it documented, but the service manager told me that if it goes after my warranty is off I get nothing for coverage even though i brought it in for that same problem. Anyways my other thought is to go to 140km 7 year warranty total plus through gm is another 3000 dollars, do you feel its worth it?

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