Transmission stuck in second gear-check engine light on-engine running rough-the week prior vehical would shift hard or slam into gear when you went from park to drive or park to reverse-now stuck in second-went through window high water but it ran fine for a few days after that- i unpluged every electrical connection and let it sit in a heated shop w/ circulating air for three weeks-didnt fix the problem
This only applies if you have an allison transmission, which based on the problem you are reporting I would guess that you do.
It sounds like your vehicle is stuck in limp mode. This is probably due to a bad NSBU switch(Neutral, saftey, back up) (if you have an allison transmission. Prior to 2002 the NSBU switches had a very poor seal which resulted in water intrusion into the NSBU switch causing corrosion. If the switch is corroded it is likley confusing your transmission. Unfortunatly you cannot repair the bad switch, it needs to be replaced. If you order one through Chevy it will cost around 200 dollars. I found one at merchant Automotive for 91 dollars. ( http://www.merchant-automotive.com/allisonnsbuswitch2001-2004.aspx ).
The switch is relativly easy to replace. the electrical connections are the hardest part as they are glued into the switch. A little heat from a butane torch should soften it up and make the connectors slide off more easily. Other wise you may have to break the NSBU switch appart to remove the connectors.
I replaced the switch for the first time and it took me 15 minutes.
Call a good gm mechanic or service manager.
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