2011 Buick Lucerne - Transmission issue

transmission disengaging after serring and cool it engaged turned off, restarted would not engage. no leaks and fluid level OK.

I have no idea what that means . But since very few people can repair their own automatic transmissions it seems that you should find an independent transmission shop.

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If you have a friend, neighbor, or relative whose native language is English, I urge you to have that person re-post your problem. At this point, I doubt if many people will be able to understand what you are trying to communicate to us.

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Transmission diagnosis is best left to professionals, and that doesn’t include the charlatans at the chain-run transmission shops.

Do you mean “after sitting”? That would make some sense and give folks a hint. Find a good transmission shop and have it looked at.