Hi I have a 2007 RRS SE with 100k miles. I have been getting the Transmission fault limited gears available HDC special programs off fault very regularly lately. It happens after driving for about 15 minutes and it will then stick in park and wont move. There is 2 faults logged:

P0613-00 - TCM processor
P0658-00 Actuator supply voltage A circuit low

Anyone have any ideas what could be causing this? I have been told the transmission mechatronic unit may need to be replaced?

Thanks