I have a similar problem right now with my stock 2006 300C (22K miles, build date 01/06).
I was experiencing some minor shift issues (maybe the 1-2 shift problem that has a TSB, posted elswhere), so when I brought the car in to the dealer for routine service I mentioned this, and they said there was a probably a software update.
When I picked up the car I noted on the work order that there were several software modules updated. I thought, that's good - new software to fix bugs and maybe some new features...
After driving away from the dealer, I noticed that, like BRobe99, the compass heading and outside air temperature were not displaying. Further fiddling with the EVIC revealed that there were menus missing - such as for the tire pressure and oil pressure. Oh, and the sunroof controls don't work. I couldn't turn around and bring the car back, since I needed it to drive to work.
I contacted the dealership, was told that maybe my personal settings were reset and that I could correct this myself... After bringing it in this week to prove that I wasn't crazy/inept, we made an appointment to have the flash checked/updated.
So yesterday I brought the car back to the service dept. I waited a few hours, but they were not having any success with it, so I left the car there. Later in the day, the diagnosis is that they think it was flashed to a base 300 model, and are not able to flash with the correct software for a 2006 300C.
They are ordering a new Cluster - which should come in next week. I picked up the car today since it is drivable, although I worry about what else might be impacted by this problem.
I was able to use the
"easter egg" key combo to get the software version that is currently loaded:
CCN SOFTWARE INFO
8/23/07 V4.13
P/N 04843155AI
I don't know that this version info is relevant (since it's just the one module), but I thought I should include it in case it is.
I'm also worried that I'll have additional trouble (like BRobe99) even after the cluster is replaced. Also, it seems silly that they can't just flash over the incorrect version, and have to replace the hardware.
Has this happened to anyone else, and if so, what fixed it for you?