Problem with my 2004 ( Car seems to drives fine) but the gearbox failure light comes on sometimes after given in gas, after its in gear. And sometimes it doesn't come on for a few miles of driving. In either case it shifts and runs fine. I can't figure it out. Afraid to drive it since I don't want to get stuck and the Dealer can't take it in till Mid June. Is there anything I should do or check? Thanks for any help.