Hud;
I had a similar problem on my 2019 CCX; the 'attached' PDF file presents the salient portion of my trouble ticket entry. Does "Walk Mode" work OK? If so you, probably, have a faulty Thumb Throttle (switch). Easy to replace, although I did learn (the Hard Way) not to slacken of the grip retaining tension screw too far - the little devils inside refused to cooperate for quite a while putting the grip back on...…..
Good Luck