Under your lower panel, GE has placed a mini-manual. This is what we use in the field to make a determination if it s a control or not.
Your model has a wash pump and a drain pump. If the wash pump is stopping when it should be running, the only test you need to make is with your voltmeter across the 2 leads going to the wash motor. If the voltage remains stable even when the motor stops, you know it's a bad motor. If the voltage is interrupted, you know it's a control issue.