I took the battery out on my 2004 Grand Prix GTP(Monsoon stereo sysetm) and now the stereo wont work. I took it to a local GM dealership to have it reset and they said its not showing any codes or anything when they hook it up. Does anyone have any idea on why that would happen and what my options are? They want to charge me $125 an hour to take out the radio and try and find the problem. Would i be better off just putting in an aftermarket radio or what? Who knew taking out a battery could cause so many problems.
Any suggestions would be greatly appreciated. Thanks.