01 Durango Bypass issue

There are only two things I've ever seen that would cause this problem - First one was my own fault and the best way to learn is from someone else's mistake:  long story short, I didn't wait long enough for the third code to program. I entered key program mode, and when I held the box up to the key cylinder, I just wasn't waiting long enough. Same with if you use the diesel mode of the remote start to program, sometimes they crank before the bypass programs. Use jumper wires and make sure you jumper BOTH ignitions, just in case. (sometimes this throws an engine trouble code, but it will reset automatically after I believe 10 key cycles)

The other thing that happened was on a little later model durango, I think it started in 03, where there was a recall on the factory WMA module that will not allow you to program another key manually. This made me rip my hair out because I had a few vehicles I did (pacifica, 2 durangos) that I had no clue what I was doing wrong and customers up my @$$, turns out FACTORY ISSUE. Call dealer and see if yours fell into that era of the recall. That's all I know! Good Luck!