Benz n00b
Sounds like some kind of SAM or relay issue somewhere in the car, might be useful to take it to a mechanic with a STAR diagnostics computer that could pull codes and figure out which unit is faulty.
The only issue I had that was somewhat similar was a steering angle sensor that went bad and would cause ESP and a few other electronic safety systems to fail since the car was receiving a bad signal from that unit.
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$12 at friendly stealer.
Easy way to start the repairs, but symptoms also show some kind of power distribution problem.
Clean and re-torque battery connections.
The Best of Mercedes & AMG
If you have a 4matic, wonder if one of your wheel speed sensors are faulty... front ones are the ones that typically go bad, first.
Wheel speed sensor might be a culprit, never had that issue before but seems reasonable.


