Thread: P0742 after fluid and filter change.

99 Pontiac grand prix gtp 3800 supercharged 160k miles.

Transmission fluid was dark reddish brown, so I did a filter and fluid change. Took about 2 gallons. It shifts rough and fluxes, and when pressing the brake when moving and then releasing, the transmission clunks. Is this thing toast?

Edit: code scan shows P0742