So a few months ago I bought my wife a 02 grand prix gt. We immediately had hard shifts after the car warmed up. So I did some research and came to the conclusion the Pressure Control Solenoid was bad. So I replaced it with an AC Delco pcs along with a new filter and fluid. Car had no problems for about a month ~1000 miles but now when the car warms up it shifts hard again and sometimes while at low speeds it jumps and bucks. So i checked the trans fluid it was low I added a quart and brought it back to proper levels I have not had the chance to test drive it but I am assuming it will still be having issues. I also have a CEL P0141 02 sensor heater circuit bank 1 sensor 2. Not sure if that is related but any advice or knowledge would be greatly appreciated thanks guys.
