Doubtful that there is a quick fix to this one. Typically when a car keeps reverse, but loses all other gears, the transmission has failed internally.
Pull the transmission dipstick and check the fluid. If it has metal shards or is black and smells like rotten eggs, the transmission has failed and needs rebuilt.
Have it towed to the nearest transmission specialist for an evaluation.
Wednesday, March 2nd, 2011 AT 5:16 AM