My wife has had the same thing on her 08 C350 a few times. Of course it never happens when I drive the car.

Anyway... What I've done is reset the steering angle sensor (turn steering from lock to lock 5 times) and it goes away temporarily. Until several months later it does it again.

Another suggestion I've heard is that if the battery is getting old, that might also cause something like that. Her car still has the original battery from August 2008, so it might be time for a new one soon...

 

TexFinn thanks for the info, I will reset the steering angle sensor & see if that helps. My battery is also the 2008 original & I will change that out. I appreciate the help

 

Oh. That is good to know. I had this once a while when I on the road. Mine battery is also OEM from 2008.

Does any know if I can get the battery from Sears Auto:Gold DieHard ? Or it must be dealership battery?

Thanks.


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I priced a dealer battery & it is $198+tax, Walmart battery is $148+tax. I'm going to stick with the dealer battery as MB batteries seem to last well. I don't know of any reason a Sears battery wouldn't be ok though. My personal preference is to stick with MB though for the sake of $50.

 

without getting the cars fault codes read its only a guessing game as to why the ESP light is on.

it could be but not limited to
wheel/rpm sensor
steering angle sensor
bad wheel bearing
can bus problem
voltage issue - whether alternator or battery

 

Vortecpwr, Thanks for the reply. I know that there could be many reasons as to why the ESP is inoperative, I was just curious if there was a common problem associated with it. I was also wondering if there is any way to test the speed sensors. The wheel bearings seem fine so that eliminates one of your recommended problems.
Do you know if a universal OBD2 reader will pick up any of the above fault codes or would the car need to go to MB & hooked up to STAR diagnostic?
I did reset the steering angle sensor & it hasn't had a problem since being reset (but it's only been a couple of days, although the car was previously doing I every time you hit the gas hard).
Thanks again for your reply

 

From my experience with a different car, the ESP light comes on and the engine is restricted for safety reasons. How I managed to fix it on my old car (2010 Acura TL SH-AWD) was to disconnect the battery and drain the system of power and wait for a few minutes. After doing so, the on-board computer should reset. In your case, the ESP stays off which is odd, so maybe this workaround with the battery might help. Goodluck!

(new to forums)

 

I have exactly the same problem with my 2007 C200. The trigger mechanism is also hard acceleration. It is also cured by switching the car off and then back on. I have plugged in a diagnostic tool and the error code returned is "P2123- Check potentiometer B37 (Accelerator pedal sensor). Hall sensor 1: Short circuit to positive."
It sounds like your problem is highly similar and could be the same issue.

 

Cruise control

I have a problem with Cruise control ESP
Works quite well up to 100kmh but set it at 110kmh and it will drop out a few seconds later. stop the engine and reset fixes the problem but still drops out 110kmh