First off, welcome!

Hmm, BCM? I don't recognize that. Also need clarity on what stays running. The engine or just the gauges? I'm guessing the gauges so I'll share my story. My ignition was staying powered up even with the engine off. It took a frustrating month before my dealer found a bad spot in the wiring harness down below the battery. That was keeping it from shutting down and also giving me some screwy idiot lights on the dash. I had a lot more miles than you (200,000) but I got a new engine harness and got another 75,000 miles out of my 2008.

 

Trucker B77, did they diagnose/troubleshoot the charging system at all? A bad battery (i.e., internal short) can trigger erratic dash lights.

BCM stands for body control module. Not sure about WCM.
[/QWas told there was no BCM did battery check and test replaced the positive post still doing it. Spent over $500 for diagnostic time

 

Trucker B77, did they diagnose/troubleshoot the charging system at all? A bad battery (i.e., internal short) can trigger erratic dash lights.

BCM stands for body control module. Not sure about WCM.

 

From the manual:

"The Sentry Key REmote Entry Module (SKREEM) is sometimes referred to as the Wireless Control Module (WCM)."

 

Could be the switch, could be the WCM/SKREEM, could be the TIPM, could be a grounding or wiring problem.

Ground G200 is on the left side of the instrument panel G250 is under the right kick panel: