95 3500 4l80e problems after remote starter installed

I just had a remote starter proffessionally installed on my 95 3500 with 4l80e. Tranny seems to be stuck in 2nd and wont shift, I let off the gas and feels like it goes into neutral. I have had no problems with the truck in the past and fluid is clean and not burnt. Filter was changed 5,000 miles ago. I read online that it might be a ignition switch (low voltage). Anyone have experience with this or ever heard of this before. I need help asap cause i can't have my truck down. :confused:

The tranny does get power thru the ignition switch and they may have tapped into that switch causing low voltage at the tranny. Without 12+ volts at the tranny, it will not shift right.

You need to see how they wired the remote starter since that is when the problem started.

//2000CAYukon