Torque Converter Clutch Always Applied
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2002 Mercury Grand Marquis, 2002 Lincoln Town Car, 2002 Ford Crown Victoria, 2001 Mercury Mountaineer, and 2001 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
Valve body (drainback valve, TCC valve and plunger), incorrectly tightened valve body bolts, TCC solenoid failure, No. 7 valve body check ball, pump assembly, input shaft or torque converter assembly.