Bspaz020

Hi All!


My first post here so I want to say thanks, although I wasn't a member I was always coming here for advice on my car (car details below).


Everything was working fine and then I got in my car at the store and my baby would not start the whirrr sound was there when I inserted key, lights, radio, alarm, everything worked! I initially thought battery which it was not. I then thought starter which it was not. I read some stuff about EIS and the steering column itself. Luckily I was on somewhat of a hill so I coast started my car. 😏 I take it to the dealer and they have it for a week before I hear anything.
They tell me it is the command module which will be $3100 plus tax!
😡😝


I have been trying to find some information on this part and can not. Can you fine folks help me out a little bit, please...
Thank You


Also was there not a recall about similar issues for this model?


2008 Mercedes Benz C300, Sport, 6-speed stick, RWD, Pittsburgh,PA

acr2001

This doesn't make sense.

It sounds like a simple dead battery.

Maybe something is wrong with your COMAND unit and it's causing a parasitic draw which killed the battery. I'd certainly figure out the problem before forking all that money over to the stealer.

Glyn M Ruck

Something here certainly does not make sense.

Did the car crank normally but not start?

You say it however started by running down a hill?

Please check:

Check start enable fuses 6, 7, 19, 27
Have the battery properly load tested.
Starter relay in the front SAM
Starter motor & engagement solenoid.

When you talk about Command module. Do you mean Comand i.e. The Radio/Navigation unit?

What you are describing does not sound like an EIS failure although it might be.

Bspaz020

Thank you for your input, it is greatly appreciated.

The car did not crank normally. I would turn the key to start and nothing would happen. On the first couple tries it sounds like it wants to turn the slightest but nothing. Yes the comand module that is associated with radio is the only command module I could find any type of information on. That is why I'm over here thinking the stealership is trying to pull a quick one. And yes the car would run perfect when coast started because it being a stick. No lights on the dash or any prompt that would signify something isn't right.

Bspaz020

I did also have the battery professionally tested and it does have juice...

Glyn M Ruck

99.9% of the time a no crank situation is caused by a blown start enable fuse. Dealars frequently miss this because they can't believe it is something that simple.

Please check. On W203 it was always fuse 52.

Uncfan1976

Same happened to mine 30 days after buying it. It was the EIS and lucky for me it was covered by stealership. Quoted me $800

Glyn M Ruck

The reason that it is possibly not the EIS is that the car runs with a push start. In the case of a complete EIS failure it should not run. We could, however have an EIS fault rather than failure.

acr2001

I'm still set on double checking that battery. If it's the original, it's got some age on it. If they are indeed blaming it on the COMAND unit, that could only make sense if it is staying 'on' (screen could still turn off and look like its off) and draining the battery overnight. You could pull the proper fuse(s) to kill power to it and then find out if that corrects the problem. That would at least confirm it. Otherwise, I see no way that the COMAND unit could cause this problem. It's not integrated into any of the EIS for the car.

Like Glyn said, make sure that battery is properly LOAD tested. If the mechanic simply checked for good voltage that's not adequate to diagnose.