Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
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One common component I have seen cause this issue here is the electronic ignition switch itself in some cases.It can short out/fail internally causing this fault here needing replaced.If nothing electrical was done on the vehicle recently and you know for sure the battery is good (as sometimes the battery can have good voltage but not enough amperage to allow starting of the vehicle) this sounds like the cause here.
The first thing that will have to be done here is to have the fault codes read out of all computers using a scan tool that will plug in and communicate with all computers to see what codes are set.Then from there the codes can be diagnosed to locate and correct this fault here.
It is possible this is a loose power connection to one of the fuse panels or one of the SAM control modules as well but most common is usually the electronic ignition switch.