I bought it new, directly from Range. I contacted them about it after a while and they said they had a firmware update and all I had to do was send it to them. Got it back and it was harsher with the shifts and still blocked OnStar. I called them back and they said "oh well that's all we can do your truck is different for some reason". So I wrote a review about the experience and the owner or someone high up contacted me and asked if I wanted to return it for a full refund. Issaid yes and if I was given the option I would have picked it earlier instead of the "oh well".
I put this one on my truck to go through car washes in the winter, tried out the reception and haven't noticed any difference. Strange optics but I don't have to remove it every few days. https://www.amazon.com/dp/B01N2WBWJ8/ref=cm_sw_r_cp_apa_fabc_mMRbGb4CNVSD1?_encoding=UTF8&psc=1
Not yet, I haven't had time to do it yet, between a vacation and a relative in Hospice it's tough. But I do have the Z23s on my wife's Acura MDX and they're awesome, no dust, great stopping power. Just make sure they're broken in correctly.
I just got it back from a supposed update to remedy this problem, OnStar ran a day ago, a week after I got it back, and the diagnostic report was blocked by a device in the OBD port. Range replied today with oh well unplug it when OnStar runs the diagnostic test, like we know when that will occur.
Well OnStar still sees it and I have an extended warranty that I'm not risking. Plus the transmission is shifting harder at low speeds. I cannot recommend the Range AFM for a 2016 GMC Sierra SLT with a 5.3 and 8 speed.
I emailed Range and they had me call in and set up the ability to send it back and have it updated to a version OnStar can't see. Funny thing when I called in the main menu asked about which product I was calling in for and Diablo was in the menu, guess it's all one company.
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