just drove about an hour and a half on really wet roads,the snow is melting like crazy today. anyways the problem was ,when I got back in town,at the first stop light I went to pull out and the tranny seemed to be stuck in 4th or 5th . ??? revved about 2750rpm before the truck would move.When I shifted it manually into 1st , it made a loud bang. went back home and tried it back and forth a few times in the driveway and it kept making the banging sound from Drive to Reverse . Engine light also on. I let it sit for about 1/2 hour and tried it again and seems fine now. anyone else ever experienced this??

You limped it

that's what I thought. wasn't even pushing it .

You were in a partial limp management mode. By this I mean that there are strategys in the TCM that take over when the TCM sees the Ally needs help but not enough to set a limp and code. You are probably fine now.
mike

You could have gotten water in the NSBU or another sensor. This has caused A hole lot of hart ache here in the great white north. Time to get out the old dialectric grease. Put it in all the electric connections.
:cool2:
Later
TranyTom

P.S.

Next Time Pull over, shut off the engine for 10 second & restart if it's a soft code it will reset the trans.

had this happen when I misted the engine with a hose attachment, rinsing it after washing. my case, i think the juice connection got wet. had the same symptoms, dried out after about an hour and all has been fine since.

I agree, I think it's the NSBU switch. I thought GM fixed this problem by now?

I agree, I think it's the NSBU switch. I thought GM fixed this problem by now?
No...........just went through my 4th nsbu, 2nd new style(tan) and will be restocking my spare in the back seat again :mad: Seems the guys plowing the snow are having the most failures -:t

well i'm glad it's nothing too serious! thanks for al the info guys:)