No Torque Converter Lock-Up
WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
Possible cause: aerated fluid, defective torque converter, engine coolant temperature low, faulty oil pump, misadjusted brake light switch, faulty Engine Coolant Temperature (ECT) sensor, hydraulic pressure too low, low fluid level, valve body malfunction or leakage or worn or damaged input shaft seal rings.