Hi @kurtiskeling
Here's the [document|33057|tech sheet] for the dishwasher.
Initially perform the ''Checking keypad operation'' procedure (see centre section, bottom of p.2) just to check if the keypad is OK or not.
If it is then run the ''Service diagnostic cycle tests'' as described by the sheet (see left side, bottom of p.1) to check if it shows what's wrong.
If you do find the problem and it is a part that needs replacing, here's a [https://www.searspartsdirect.com/model/15qhafi011-001198/whirlpool-gu2455xtsb3-dishwasher-parts|parts list] that may be ''useful''.
Scroll through the list to locate the wanted part, to find the ''manufacturer's part number'' that is listed with it. Then search online for the ''part number only'' to find suppliers that suit you best.