OBD II P1927 error on Mercedes C200d

Can anyone tell me what this manufacturer specific code means? 

This is on a Mercedes Benz 2016 C200d.

 

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MBFanatic made a comment.
11 months ago

Brake light signal implausible. 

 
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safaaz made a comment.
11 months ago

Thank you very much.  Any idea how to fix this? When it happens...its usually when the vehicle is at 140km/h then the gears dont change smoothly anymore until i switch off and start again.

 

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