Welcome to JustAnswer, my name is XXXXX XXXXX I'm here to help get your problem resolved. Ask follow up questions, thanks. I would start by getting a transmission flush, replacing filter, and replacing tcc pwm solenoid next step will be inspecting fluid for clutch material and if good clean out valve body. Let me know if you have questions, thanks.
Still having problems with code PO894 coming up...
I have changed fluid, filter, and PWM Solenoid. The vehicle code can be cleared and driven up to 50 miles. The check engine light then comes on again and shifts hard.
This vehicle had the wiring harness repaired at one time. Could a bad wire in the harness cause this?