Originally Posted by
WarrantCWO
I'll check all of the grounds and the main engine ground under the car. Corrosion seems to be a common problem there. If so I'll just replace it with a new one. They're just a few bucks.
I gave you the link to the thread on how to permanently (and properly) fix that. You put the ground in that James (or I) did. The strap from block to chassis has to be the most mentally-vapid thing they did to our cars.
That strap does not belong there, the added ground cable does.
While it appears a new battery fixed it - which is no surprise - give it a few days. Sounds like you already know you fixed it, but again, the issues with the RCM can come and go. (As can so many other electrical issues, really.)