Stock read vehicle info

Good morning all,

I just did a stock read on a 2012 GMC Canyon. I'm just getting started with HP Tuners and was going to do the tire size change. Figured I would start slow and work my way up. My problem is that the read shows the wrong rear end ratio. It shows 3.73:1 when the truck has a 3.42:1 ratio. I want to change the tire size to 29" as that is what is on the truck currently. Do I need to change the gear ratio also or leave it as is? I've attached the tune file.

On a second note, I get a P0606 error from reading the ecm.

Thank you.

Is the RPO code in the glove box GU6 or GT4??

The code is GT4.

Well, that answers it! It's a 3.73 rear. I never looked after I bought the truck new. I was told it was a 3.42 rear. Thank you for the help!

That P0606 code indicates an internal fault in the PCM. You might start looking for a spare PCM at the junk yard or online.

Rick

Thanks for the info. I was thinking that is the case. I was just hoping it was a strange occurrence with the E67 PCMs that just show up with that error. Kinda disappointing because I just read it and used my credits to change the tire size.