Frigidaire washer won't agitate

My Frigidaire washer model GLWY1343ASO will fill with water and drain the water and spin but it won’t agitate the clothes in that cycle. Any suggestions please. Thanks

Operate it with the front panel off and see what the motor and belt are doing. If the motor is turning then the transmission may be the problem. If the motor is not turning, then the timer or wiring may be the problem, since you know the motor is ok because it spins the drum.