So, I've been fighting this issue for well over a month. Is anyone else having this problem? If I change the speedo output in my tune for the taller tire, it kicks the ABS light and parking brake light. No matter what values I change (manually and auto calculate from the wizard) it still does it. I just ended up doing the auto scale then changing the speedo output to stock so, I don't have to deal with the annoying ding and dash lights. In turn my speedo is obviously not correct. Wanting to put gears in this thing but, think it's damn ridiculous I can't perform the basic speedo change.

 

Cool story. You give no details for anyone to help.

 

Must be some large *** tires.

 

the question is: Do you have this problem?

 

31.5"

 

No I don't. And neither should you with a 31.5" tire. But I don't use any hpt wizzard. I know how to do it manually, but then again you don't give enough details to help.

 

I agree I shouldn't have a problem, hence why I'm asking others if they have had the same issue. What software are you using? If you are willing to help please ask what details you would like, thought I was pretty detailed other than tire size and the truck is a 2007 Silverado? As mentioned earlier, i did it manually as well as with the built in tire/gear wizard that auto scales within HPtuners. Either way, when I change my pcm output calibration aka pulses per mile which corrects the speedo, the codes set.

 

I would need the stock tire size and the new tire size (actual sizes, not height in ") and the HP Tuners file with the stock tire size values in it. It needs to be a file read with V2.24. I don't use the bug ridden V3.xx.

 

Sorry, don't have 2.24. I'm using 3.5

 

Don't know why you're sorry. I'm not the one with the problem.