Less than three years ago, I had a pressure control solenoid installed in the transmission on my 2000 Century. It cured a intermittent hard shifting problem and whine when starting out from a stop. I could usually stop this problem if I turned off the ignition for a few seconds but this became diffcult in stop and go traffic.

The problem is coming back, about once or twice a week. Is this a known problem? Is there a TSB? Should GM help pay for repair because the same part has to be replaced?

I'm not sure man, we've got a 2002 century, and i've never noticed any problems. Have you ever had the fluid flushed?