White Denali wrote:So if it's a 2015 you must have the 6.2 with the 8 speed.

Yes

I installed it on my 2015 Silverado. The shifts are firmer. I haven't had time to play with the shift points yet.

Jay

There is a TSB for hard down shift to 1st gear. If your truck in still under warranty take in to dealer and complain about hash 1st gear down shifts. That should get you the current TCM firmware.

Jay

I may have an answer. Some of the trucks have a valet mode and/or a teen driver mode. If you have either of these options, the speed limiter is controlled by the BCM, not the ECM. There is a setting in the ECM for the speed limiter which can be set to ECM or Other module(BCM). I don't know if the i2 ...

I did too. There is a setting in the ECM for the speed limiter to be controlled by the ECM or Other Mod. This has to do with valet mode. If it set to other mod the speed limit number in the ECM does nothing as it controlled by the PCM. Unless the i2 changes the other mod to ECM you can't change the ...

I live between Denver & Colorado Springs and buy 91 octane all the time. I have never seen true premium gas that is lower than 91 here. Some stations only sell reg (85) & mid grade (87). The reason for the lower octane is the air is thinner and you get less compression (unless you have a turbo or ...

Well you may think there isn't anything wrong with you web site but for me I can get it to work with chrome only. On my mac it won't work in Firefox or Safari. On a windows computer it doesn't work correctly using Firefox either but does work in Chrome. Clearing cache & cookies on either mac or ...

If you select the vehicle at the top of the page it will populate where you are trying to change it.
I did this before I bought the i2 and it looked like there were a lot of options (according to web site), but when I got it 99% of them are NOT available ( I understand the transmision will be ...