No communication with the TCM. Car is in limp mode
Good evening I'm having a issue finding the problem on this 2006 Chrysler 300. I check the power, ground, the high and low bus communication to the TCM and all checks out fine.
Load test those powers and grounds, all of them. If they are fine, replace tcm
I would disconnect the pcm and see if you have comm with tcm. The P0605 is a pcm failure code for the most part.
As Mario stated, make sure your power and ground can carry current. I've chimed in because I encountered the identical symptoms and codes no longer than 2 months ago...300srt with nag1. Used tcm followed by programming was the fix.