Kitchen Large Electric Appliances - GE-Wont drain after rinse cycle

I have a GE Triton Dishwasher that is 5yrs old. I took it out,pulled the drain hose,took out the screens and did not find any blockage, put it back in and started a wash. It drains the water after each wash cycle but once it gets to the rinse cycle it will not drain the water, I hear and feel the pump pulsating but it will not engage to pump out the water. Being that it drains the water during the wash but not the rinse I would think the pump is good, but possibly a timer issue ??? What part should I be looking to replace ? Need help quick the wife and daughter are starting to cuss at me when they have to wash dishes by hand...Thanks

Model - GSD5930F00WW

I would agree on being the timer... you can always put it on rinse cycle and check for power to the pump wires to verify if timer is or is not sending power