Reviewed By Alan S (CROSSVILLE, TN) Reviewed for a 2015 GMC Yukon XL —10/30/2015 8:37 PM
The device did exactly as described; plug it in and the AFM is immediately disabled. The only problem I am having with my device is it does not always work when starting the vehicle. I must unplug it from the port, wait a few seconds, and reinstall. This immediately brings it back to life. My fuel mileage is almost identical, and the vehicle operates much nicer now that the V4 does not engage.