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are you guys happy with the Range AFM disabler? I was not

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Issues as well, Range AFM WORKED fine for a few months in my 2017 GMC Sierra w/ 6L80 transmission, the mileage was fine, drove fine.

about a month ago, my transmission acted up, wouldn't shift, over heated the transmission.

Now I was told to unplug the device and plug it in when truck was running. Then it worked again, for a while, now again, I am having shifting issues, truck shifts into high gear too soon, 1,2,3 is ok, then it goes 4th 5th 6th  too soon.

I will toss this thing and advise against anyone getting one. There are better ways. Cost me a tanny flush and reprogramming (reflash). Pfft. P.O.S.  is my opinion!


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  • 1 year later...

I have a 2011 Yukon XL. 5.3L At 300000 I got the miss fire warning sign. Took it to the GM dearler and was told you need a new motor. Can be installed for around $10000.00. Was not too happy about that sooooo. I bought a range AFM disabler, changed the spark plugs ( which 4 of them were badly fouled ) and now have 550000 KMS on the same vehicle with no issues what so ever. Only thing I notice is once in a while it seems to burn some oil rather quickly ...did some research and found I should have bought the AFM disabler sooner. I am a happy camper. I now also have a 2015 Yukon XL denali 6.3 L and guess what. It also has an AFM disabler and there are no issues at all. Even happier!!!



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