Chrysler does diagnostic.? I have a 2005 Chrysler 300C. The transmission has been clunky and for about 6 months now and recently when pulling away from a stop light, there was a shift issue with the transmission then the malfunction light illuminated and the car continued to drive. More recently, from second to third gear, there was a large clunk when shifting. The engine completely disengaged from the wheels, so the engine was reving but there was no power to the wheels. I pulled off to the side of the road, put the car in park then back into drive and I was able to drive. The light then came on next time the car was started. In both instances, the light went off after about 3 days. At this point the car was brought into Chrysler and they ran a diagnostic after the light went off. The only error they got was a windshield wiper issue from a long time ago. What could possibly be the issue the the car that the on-board diagnostics does not remember the light and problems with the transmission?