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No sense in buying one just for this and you not tuning it yourself or having someone remote tune it. Find a local tuner that’s reputable and have them check the car out.
 

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Discussion Starter · #22 ·
HPTuners is the brand. Are you sure you wouldn't be better off consulting a local tuner before shelling out $600 for tuning software?
iam Definitely going to take it to a local tuner . would they be able to tell me the problem if it wasn’t a bad tune ?
 

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iam Definitely going to take it to a local tuner . would they be able to tell me the problem if it wasn’t a bad tune ?
Yes they should know by driving the car and doing some data logging. Good luck
 

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Discussion Starter · #25 ·
So update, I had someone hook it to hp tuner , and he said that the car shift pattern a & b different . A being Performance & B being “trailer” so why my last 2 gear shift and drive like that
 

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A trustworthy dealer should be able to reset the Adaptive Learn on the transmission for free, that got rid of a downshift "cough" issue I had as well as smoothed out some of the gear changes when cruising around doing errands. My whole car is stock though with only a CAI so your experience may vary but it's a good start to see if it's 'bad behavior' that was learned or an actual tuning/programming issue.

Edit: Nevermind, OP's issue was solved 🤦‍♂️
 

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Not so sure it was solved. To read the files are free but to write and make changes cost money. At the very least it’s 50 bucks to make changes to the TCM.
 

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So update, I had someone hook it to hp tuner , and he said that the car shift pattern a & b different . A being Performance & B being “trailer” so why my last 2 gear shift and drive like that
I hope your tuner understands what's happening better than you just explained it. All GM cars have shift patterns A & B and they can be assigned to whatever is relevant to the model. I used to set one pattern to cruise control and write the shift points for better fuel economy.

I don't know how or why trailer mode would activate, but it's not changing from pattern A to pattern B just for your 5th and 6th gear shifts, that's not the way it works.
 

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Discussion Starter · #29 ·
A trustworthy dealer should be able to reset the Adaptive Learn on the transmission for free, that got rid of a downshift "cough" issue I had as well as smoothed out some of the gear changes when cruising around doing errands. My whole car is stock though with only a CAI so your experience may vary but it's a good start to see if it's 'bad behavior' that was learned or an actual tuning/programming issue.

Edit: Nevermind, OP's issue was solved 🤦‍♂️
issue not solved😒
 

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Discussion Starter · #30 ·
I hope your tuner understands what's happening better than you just explained it. All GM cars have shift patterns A & B and they can be assigned to whatever is relevant to the model. I used to set one pattern to cruise control and write the shift points for better fuel economy.

I don't know how or why trailer mode would activate, but it's not changing from pattern A to pattern B just for your 5th and 6th gear shifts, that's not the way it works.
so what do you suggest, cause I feel it getting worse 😥
 

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This issue only happens on upshift? 4-5 not 5-4 or 6-5?
Sounds like a solenoid problem. 6L80E and 90E run electronic shift solenoids. These can be prone to failure if an aggressive tune and cam is done without upgrading the box. I built a purpose made 6L80E for a supercharged LSA in my SSV wagon. The Tran’s module may also be a problem ,but if it’s only one gear then most likely a solenoid shifting problem.

get the box serviced before going down a retune path because it will show up any other problems.

just my 2 cents worth
 

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Sounds like a solenoid problem. 6L80E and 90E run electronic shift solenoids. These can be prone to failure if an aggressive tune and cam is done without upgrading the box. I built a purpose made 6L80E for a supercharged LSA in my SSV wagon. The Tran’s module may also be a problem ,but if it’s only one gear then most likely a solenoid shifting problem.

get the box serviced before going down a retune path because it will show up any other problems.

just my 2 cents worth
The tune is already pulled. Anyone with HPTuners experience can look at it and tell if it's a bad tune before a dollar is spent.
 

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The tune is already pulled. Anyone with HPTuners experience can look at it and tell if it's a bad tune before a dollar is spent.
I honestly don’t think the person who pulled the tune file wants to hand it over to the owner because I haven’t gotten it yet. We were chatting and all of a sudden crickets. Maybe busy something came up who knows but he doesn’t have the file he is “waiting for his friend to send to him”.
 

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Hopefully the tuner has found the discrepancy himself, or comes to realize that nobody here is looking to vilify him. It may be that someone here is able to point out the issue, not only making him a better tuner but also quite possibly saving his customer's transmission in the process.
We don't need any names, just a file for a couple of guys to look at and perhaps make better...

Edit. Not me by the way, that Holiday Inn Express visit did nothing for my tuning skills...
 

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Hopefully the tuner has found the discrepancy himself, or comes to realize that nobody here is looking to vilify him. It may be that someone here is able to point out the issue, not only making him a better tuner but also quite possibly saving his customer's transmission in the process.
We don't need any names, just a file for a couple of guys to look at and perhaps make better...

Edit. Not me by the way, that Holiday Inn Express visit did nothing for my tuning skills...
I don't think there's any indication the tuner who read the car with HPTuners is the same guy who tuned the car for the modifications. There shouldn't be any ego involved.
 

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Discussion Starter · #38 ·
I been real busy lately, that’s the only reason I haven’t been able to get back to anyone . I do wanna thank you all for helping me honestly . He still haven’t emailed the file , I honestly dk his schedule, but hopefully I get to the problem . Could it be the shift pressure from 4th to 5th , and 5th to 6th??

And it seems the problem is getting worse 🥴

I asked him to look at it but I believe he only knows so much . And I don’t know many people, that would actually take the time out of there day to help me .SO I AM GREATFUL I HAVEHELP FROM YOU GUISE
 

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I honestly don’t think the person who pulled the tune file wants to hand it over to the owner because I haven’t gotten it yet. We were chatting and all of a sudden crickets. Maybe busy something came up who knows but he doesn’t have the file he is “waiting for his friend to send to him”.
If you do get the tune file and want a second set of eyes let me know, GM's 6-speed automatics are my tuning specialty.
 
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I been real busy lately, that’s the only reason I haven’t been able to get back to anyone . I do wanna thank you all for helping me honestly . He still haven’t emailed the file , I honestly dk his schedule, but hopefully I get to the problem . Could it be the shift pressure from 4th to 5th , and 5th to 6th??

And it seems the problem is getting worse 🥴

I asked him to look at it but I believe he only knows so much . And I don’t know many people, that would actually take the time out of there day to help me .SO I AM GREATFUL I HAVEHELP FROM YOU GUISE
IF its getting worse,, and nothing in the environment is changing,,, then the best advice right now will be to get it on a lift at a competent Transmission Specialist!!!! Putting more mileage on it will not turn it into a fine bottle of wine!!! In other words,,, its not gonna improve with age,,, or in this case,,, mileage!! That box is already high mileage per your description!!!

I will opine that there is something internal at or near catastrophic failure!! Could be,,, as others have pointed out,,, a solenoid,,, or perhaps worse!!!! At a minimum,,, get it to a shop,, plug in a diagnostic tool (Think Snap-On Solus or equivalent) ,,, and drive test it with a competent technician!!! Also,, if its NOT throwing any errors,,, while you have it in the air,,, do a complete pan drop,, filter change,, and service!! IF the ATF comes out dark and stinky,,, that will also be an indicator,, of bad things to come!!!

At some point,,, if you bang your head on the wall long enough, with this issue,,, you will end up with lacerations and a concussion,,, and the trans will still be broke!!!! Save yourself the aggravation IMHO, if you are over your head with this problem and refer to folks that do this stuff all day long for a living!!!

Jus Sayin!!

ES
 
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