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Q: Check Engine light is not on. on 2000 Buick Regal

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My car jerks when the automatic gears change and the check engine light is not on, and I had the transmission fluid and filter changed. Please reply.
(1) Answer
If there is jerking when gears shift, there is likely an internal transmission issue, or a pressure issue at the valve body. It may or may not be repairable via electrical components in chassis.

A diagnosis needs to be performed to determine the extent of the issue and a recommended repair path.