Well, it seems once every two years the ESP module acts up. I was putting gas and after driving off, I get the typical "EBR, ESP,ABS Failure" It's been three days now and the light did clear up twice but it does come back on.

Now I know how touchy these cars are with battery voltage. I put it in diagnostic mode to see the battery voltage on the dash and when I first start the car, it reads 11.9V-12.5V for a few seconds before going to the normal operating voltage 13.9V. I am trying to get it to read 13.9v on startup and see if that is when the lights don't come up, is this normal startup voltage?

I am hoping someone with a properly working c300 can go in diagnostic mode and check if the battery voltage takes a few seconds to go to 14V on startup.

I can look maybe tomorrow

It went away after a few weeks for me

Well, seems like it fixed itself after a week of driving, yet again... Seems like it's a regular hickup that happens every year or so with these cars. For anyone with a Mercedes getting ESP, EBR, ABS faults, drive on it for a week or two and see if it resolves itself. Do not pay 1000$+ to get the ABS/ESP module replaced right away.

Oh I'm sorry I totally forgot to look!

No problem, thanks anyways. I had a feeling this would fix itself like it always did.

Yes, The error came back and then disappeared after another drive cycle.

Impossible to know without something completely failing. It may suggest something is on it's way out.

I wonder if it's a bad ground that just acts up?