i was trying to put the car in park and it kept going bk to reverse on 2001 Cadillac Eldorado

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
it was doing this on its own and all the lights would flash like the P R N D what could have caused that
(1) Answer
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seek free est from aamco then shop prices
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