My Honda Odyssey 2016 EXL started doing this after I accessed the hidden diagnostic menu to aim my new passenger mirror camera. All at once the menu shut off and upon restarting the van it started flashing the menu and shutting off. I cannot get the van to start. Any advice appreciated! Thanks!

 

welcome to the forum have you tried disconnecting the battery cable for a few minutes and reattach. you will loose the radio and need to have the code. it should be in the stack of owners manual and information. if you do not have the code to get the radio , take your id with your current registration to the local Honda Dealership and they will enter the info and get the code for you.