Incorrect fluid level

Add fluid to the proper level. Refer to Transmission Fluid Check .

Sticking valves in control valve body assembly

Rebuild the control valve body assembly. Refer to Control Valve Body Replacement .

Low main pressure

Refer to Low Main Line Pressure in All Ranges and Low Main Line Pressure in Specific Ranges, Normal Pressure in Other Ranges .

Leaking trim solenoids

Repair or replace the trim solenoids. Refer to Control Valve Solenoid Replacement .

Erratic speed sensor signal

Refer to the speed sensor DTCs.

Piston seals leaking or clutch plates slipping in range involved

Overhaul the transmission.