Well, ran into my first problem on my Benz this weekend. Driving it as normal and with know signs, stopped to eat and when I got back to the car, it wouldn't start. You know how you try to use the push-button start without pushing the brake? It was like that, with and without the key. The starter wouldn't even try to kick on like a relay went out. Everything else works and no faults or errors on the screen. Everything appeared normal. I'm not sure if the aux battery has anything to do with the starter, but my main battery is new and the screen should tell me if that was the issue or the battery was low, and it didn't. Any ideas? She's in the shop right now...

 

lol Never mind, it turned out to be the starter solenoid... New starter, problem solved....