I am new to the forum and hoping that I can get some direction................... I literally just got my 2014 CLS550 less than a week ago - it ran great for 48hrs and then overnight all hell broke loose.
The following items just stopped working - I checked all the fuses and there were none that were blown, I tested the batteries and both are new and charging fine, even the alternator tested fine.

Gas Gauge - not registering any fuel level, but I just filled it up completely
Key fob - will not lock or unlock any more, I replaced the battery and still nothing
Open hood - I never opened the hood, yet showing that it is open now
ECO Start/Stop - was working fine and now nothing at all, the button does nothing at all
Seat heater/cooling - pushing the buttons does nothing at all and neither is working
Trunk close - pushing the button on the trunk does nothing, also I can't open it without using the physical key
Rear turn signals - neither the left or right turn signal is working now

These are all the gremlins I have found so far....... I am in the DFW area, so open to suggestions if anyone has a trust shop in the area.

Thank you all in advance for the time and looking forward to getting back on the road with all things working again............

I understand 75% of this common MB chaos.
The bad news is there's no easy cure that I know of... so why not put pressure on whom sold you his lemon?

The way to go about it is to go after active faults. Right now both of your SAM'S are in crisis. That puts you in the territory for drained battery and limp-modes.


Go easy with the joy-riding. The engine and tranny are interconnected to disrupted CAN-C. Italian tune up redline will only heat things up, not fix anything.

Find a good Indy shop and use a iCardoft/Autel scanner to keep an eye on faults for yourself.

Any display message while driving?

> Temp Fix:

1. scan existing faults
2. reboot the car (battery disconnect)
3. test drive 15 Miles
4. scan again

Thank you for the info - I checked batteries and they are testing fine. I even purchased a new AUX battery and same, situation. I have ordered a replacement rear SAM and awaiting its arrival. I have had the codes checked and the only thing showing is:
U011187 - Communication with battery control module is faulty

Oddly enough this was a stored fault from 29k miles and doesn't appear to have been addressed.

I just noticed today that nothing down the right side is working, windows, door locks, etc.
All of this happened almost immediately after I washed the car. It was shipped to me, and filthy - I just rinsed it off, but with all of the faults, I am positive there was a leak or something that caused this issue(s)

so you're saying currently nothing on the right side is working and there are no faults... right?

Rain penetration may be at play here ... check carpets and trunk for any moisture

correct, nothing on the right side at all - I checked and no moisture or signs of moisture. The only time liquid was near it was on the initial power wash to rinse it off - I fear that I definitely got water into some channel and that triggered all of this - now I am trying to isolate it. I am not seeing any faults other than what was already listed - no lights on the dash at all -

How many DCU Modules can you see listed 2 or 4 ?

Your CAN-B distribution bar may be involved in not passing sigs. That's what these two modules share in common besides pwr✌️