Adaptive Equipment problems of the 2014 GMC Sierra

Vehicle was purchased new from a dealership. The vehicle is modified and sold commercially under the rmt (rocky mountain truck works) package. The package includes modified suspension and lighting. When accelerating, the transmission fails to shift into a passing gear causing the rpm(s) to exceed 6000 at which point the rev limiter shuts down power to the vehicle until the rpm(s) are back in a safe operating limit. The first time this happened, I was attempting to pass a vehicle on a secondary two lane highway. When I was in the passing lane, I accelerated to overtake the vehicle but the rpm limiter shut down power midway through the passing. With oncoming traffic, and loss of power, it made for a very serious situation. I have contacted the dealership and they have worked on the vehicle multiple times to try and correct without success. They have confirmed that this happening with all the rmt modified vehicles that they have test driven. These vehicles are commercially marketed and it is only a matter of time before someone is not as ¿¿lucky¿� as I was.

Vehicle hesitates and stalls upon acceleration. According to gm document id number 3685734 this is a normal condition and they have programmed the vehicle to do this. If going into traffic and trying to accelerate, the built in delay can cause close calls at best and worst case an accident. This coupled with the transmission issues mentioned in document id number 3575856 creates the perfect storm for injury and / or death. Gm refuses to address the issue other than to say they feel it is not a problem. This covers virtually all gm vehicles since 2007 with the 6 speed transmission.