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Q: why does my transmission shift to neutral while driving and won't shift again? on 1999 Mercedes-Benz ML320

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
i was driving when it just went on free willing.i pulled over.restarted the engine ,put on drive but after 50 meters it did the same thing.i have to restart engine ,drive 50 meters and the cycle repeats.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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check the fluid level, beyond that it is an internal failure from either front pump or seals failure

i flushed the tranny today and filled it up with the specified fluid.5 qts it was shifting smoothly on D,but won't shift on the manual gears.added another qt,now i'm back to the same problem,it happens when the engine has warmed up to 85 degrees check engine is not on.can i still get a code with a reader?thanks for the reply.
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