ATF temperature sensor

Refer to Diagnostic System Check - Vehicle

Line pressure solenoid

Refer to Diagnostic System Check - Vehicle

Shift switch positioning

Refer to Diagnostic System Check - Vehicle

Transmission control module (TCM)

Refer to Diagnostic System Check - Vehicle.

Low clutch

Burn or wear of the low clutch. Refer to Low Clutch Disassemble

Low clutch accumulator

Malfunction of accumulator

Broken or damaged oil pump

Seized or broken pump gears

Control valve spool

Control valve spool error