NB64

I had been traveling on a major highway when the truck starting suddenly slowing down. I thought that the module might have cut off the engine again so I immediately shut down the module. But then I noticed that the gear shift indicator was now in "2" instead of "D". I tried to switch back into "D" but it went into "N". Then I put it back "D" and it went back into overdrive and all was well for the rest of the trip. I don't think I was anywhere near the shift lever while I was driving. So it might have been a hiccup or something more to come. Maybe sometype of transmission selonoid?