Yup, that did the trick this morning. Thanks! I hardly ever use the radio, so hadn't tried to reset it for a few weeks, so maybe the delay, or initially forgetting what buttons I needed to press (and pressed some other combos) made the radio think it needed the timeout, even though I never actually put in a wrong code.
So I need to leave the radio on 50-60 minutes and THEN see if I can make it take the code? I have a long drive tomorrow AM, so will go switch the radio on now, so it comes on right away and reminds me.