I have a 2005 SRT6 with RCM updated for Mystery no Start by tighed1 with replaced Air Pump Relay and Me so Horny mod back in 2017.

My Problem: Key turn does not engage starter, but electronics work.

First: Sometimes will start and all is normal and sometimes “Mystery no Start”.

Second after a week: Sometimes will start with instrument cluster lights: Brake, ABS, BAS ESP, and Brake Wear. When this happens, I can not move the trans out of PARK.

Finally yesterday, after a normal start during driving the instrument cluster lights: Brake, ABS, BAS ESP, and Brake W come ON and the car goes into LIMP mode. After limping home, I can not longer start anymore. I checked for engine codes via ODB reader but found none (but that may be due to me disconnecting/reconnecting the battery a few times).

My best guess is maybe the RMC again, even though I already had the in updated in 2017. So maybe I purchase a spare RMC and try that out, what do you folks think?

Looks like Amazon has the Standard Motor Products RCM for $123:


Pics of my RCM from 2017 rebuild.