I own a 2009 Challenger SRT8. As of recently, I have had a TON of issues with it. At about 35k the transmission had to be rebuilt and when I had it done, the transmission rebuild shop put an "upgraded shift kit" in it. About 6 months later the car died and unfortunately it sat dead for about two months before I could get a new battery for it. When I finally got to put a new one in, I would drive and it would lose power and shut off. I then realized that the alternator had to be replaced. Soon after replacing the alternator, I had the ABS, check engine, emergency brake light, traction control, and ESP/ BAS warning lights. I used my OBDII reader and had the following codes: -P0501: Vehicle Speed Sensor A Range/ Performance -U1412: Implausible vehicle speed signal received -U1409: Implausible left front wheel speed signal received -U140C: Implausible right rear wheel speed signal received -U140A: Implausible right front wheel speed signal received -U140B: Implausible left rear wheel speed signal received -U1418: Implausible right wheel distance signal received -U1417: Implausible left wheel distance signal received -U1412: Implausible vehicle speed signal received -C121A: Steering angle sensor not initialized -C2204: Dynamic Sensor Internal -C2200: Anti-lock brake module Internal -C102B: Right rear speed sensor circuit -C1020: Left rear wheel speed sensor circuit -C1015: Right front wheel speed sensor circuit -C100A: Left front wheel speed sensor ciruit Additionally, when I shift the vehicle into gear it is jumping forward (or backwards) depending if I put it in drive or reverse. The last time I drove it, the speedometer stopped working and sometimes the vehicle would only left me go about 20 mph. I would have to pull over and turn it off and on multiple times before it would start to work again. I don't know what to do at this time and really need help. I think that the ABS module and the computer might have died but i want to see what everyone thinks. Anything helps and I really appreciate any input!