Shift solenoid A

Refer to Diagnostic System Check - Vehicle.

Shift Solenoid B

Refer to Diagnostic System Check - Vehicle.

Vehicle speed sensor

Refer to Diagnostic System Check - Vehicle.

Shift switch

Refer to Diagnostic System Check - Vehicle.

Transmission control module (TCM)

Refer to Diagnostic System Check - Vehicle

Line pressure out of range

Operation of the control valve spool

Line pressure OK

Operation of the 2-4 brake band