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 trailer all over the Rockies, and west coast and back. Never a problem, great performance, and totally happy with the tuner. Always good customer service, seems like people who bother to call in get faster results than people who wait till Saturday or Sunday and expect results on a forum. Well, maybe only worth 1 cent. Thanks for your customer service.
Do you have the same year, make and model of truck I do? Same engine and transmission? id bet not, so, therefore, our calibration files are probably different as well. So, in that case, your comment and time spent posting it is completely irrelevant and therefore you could have saved yourself the trouble. If you want to give any diablosport employees a handy in the parking lot, call them direct.
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I have resorted to just driving the truck around and never using tow haul mode, seems to be ok that way. Luckily, I haven't had to tow my trailers lately. But eventually, that wont work anymore.
When I took the truck to the dealer, and had to have it restored, after that I towed both my trailers, the boat and the car hauler, several times, and tow haul mode worked great. Along with the other trailers I towed, a multitude of small and rather large trailers working for an RV dealer, and never an issue. All I wanted from the very beginning was to make the trans shift a bit snappier, like my other tuned cars do. the 6L80E has a reputation as a bit of a slushbox. As for the governor and all that crap, its a Denali XL, im not going that fast, could care less.
Now that one of Diablosports products has altered it again, it does something odd again. Strangely with some similar symptoms, as the last time, I lost control of the manual gear selector same as now, however it did it in normal mode, not tow haul. Coincidence? Not sure, but worth noting. last time the tuner wouldnt communicate and said it couldnt return the vehicle to stock because my truck was suddenly an unsupported vehicle.
Now, it claims it does return it to stock, but the problem doesn't go away. However, there are no error codes, CEL, etc. If this was a mechanical, sensor, etc issue, why is it normal in any other instance, until it is put in tow haul? Why does it want to rev out and gear hunt, with NO change in throttle position, engine load, etc. Why does that one button make it go apeshit, when otherwise it didnt before? If it was a problem in say the TPS, APP, etc, it would show itself regardless of tow haul mode, because as the video showed, APP and TPS stayed consistent, and the behavior was erratic in only that mode. This tells me that something is wrong in the programming of that table and set of parameters.
