I picked up a 2003 G500. It drove fine upon putting it on delivery truck. Once arrived it would not shift into D. Stuck in P until used screwdriver to stick down in gear shift override mech. Once in D will not shift gears (limp mode). Also PRND indicator still shows it in P no matter if shifted into R or D. Ive read a lot of post of one occurring but not usually both situations together.Help?