Yes, this is by FAR not my first go round with a tuner. I am actually more used to modifying individual parameters one by one on a laptop. I mostly dealt with the 3.8 GM supercharged and NA cars, swapped 3.8 SC'd fieros, etc. Wiring PCM's wire by wire for swaps, and then tuning them, and all manner ...

I found a workaround of sorts, I still dont like it, but itll work....

if i put the truck in manual mode, and go all the way up to 6 with the selector, THEN turn on tow haul, itll shift and behave normal, and just do its thing. so, it would appear that I just need to remember to do this, and itll ...

I took it out for another drive today, and re-verified the issue, as seen in the better video. I have a new phone now, so the video is much better.

https://www.youtube.com/edit?o=U&video_id=nBpvnVGoetg

Same thing, normal on all counts until i hit the tow/haul button, then it loses its mind. at ...

Just my two cents worth, but I get tired of the bad mouthing of your product I see on this forum. Sure, things don't always go perfect with anything mechanical, but I don't see how a tune has anything to do with the tow haul mode. I just spent two months and towed for 9,646 miles with my travel ...

I tried return to stock briefly before a week ago, took a quick trip and was still strange. So it's running the tune that is uploaded now and I'm just not using tow haul mode. Maybe it isn't truly restoring??? I'm at a bit of a loss with how much trouble this has all been.

I could try again with ...

And, the shitshow is back.

Finally did a tow with the new tuner's tune in there, and it is losing its fukking mind in tow haul mode. It actually bounced off the rev limiter several times on flat land with an empty flatbed trailer that weights about 1500-2000 lbs, at 5% just cruising along throttle ...

Update:

Got a replacement tuner, did updates and threw the basic time in there. Worked out soo much better this time!

Thank you Mike for help me with this. It was a painfully frustrating shit show, but it all seems to be ok now. I still need to fine tune the tune itself, but for now, it's firmer ...

what a shitshow that was. took it to gmc dealer yesterday at around 10, with appointment, was told 2 hours itll be done, end of day at worst.

find out today at 1, after no calls back, etc, that they havnt even started it yet. WTF, its a PCM flash/software update, come on.....

went and retrieved ...

truck is now at dealer, for the day. they are backed up apparently.... such is my luck, and ill get it back by the end of the day they hope, maybe tomorrow.

where is that (bangheadondesk) smiley when yoyu need it?

What is the address to send the bill to? Want to PM it to me?

it is able to show the vin in the i2, so it at least communicates that much.

file attached.

Ill try to check this thread before i head in to the dealer tomorrow, give myself enough time for a last ditch effort to save this thing before we just go back to square one. one way or another, the truck ...

just got off the phone with your place, another guy, i am pretty sure his name was mike as well, said you were busy. i wanted to speak with you to not explain it all again, but oh well, i get it, he said you were the boss and busy, no biggie. we did the registry reset, and back to the same result. i ...

i submitted a ticket or inquiry on the website, and received one email back asking to upload the files, since the website was giving me an error when trying to do so as part of the initial inquiry. I responded with the files, and never heard back. I tried emailing again in the same chain, again ...

This Florida time thing is killing me. Truck is still all sorts of screwed up with no resolution. Now it doesn't shift at all, or seems to want to skip shifts. This is terrible service. Tried to make it home on time today early from work to meet your florida schedule, but missed it by minutes.

I ...

will do, at work, ill try to get to this tomorrow morning.

just frustrating. took the truck out for another drive, and the shifts are just terrible. even my wife commented, and she isnt normally one to say anything unless its really obvious.

ill try to call in tomorrow morning.

Tried calling, closed. Must have just missed you. It was before the cutoff time, but oh well.

EST M-F timing is a huge pain in the ass for people with jobs.......... Means ill have to take time off work to get this handled....

Still waiting on a resolution.