'05 s55 amg arc warning light comes on while driving over bumps. What causes it?

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'05 s55 amg abc warning light comes on while driving on slight bumps. At the same time front of the car also makes squeaking noises. Sometimes joint popping sound comes from under the car when I steer it. Abc fluid reservoir was very low but no leaks. flushed the system, did rodeo, and still the same. Any help is greatly appreciated.