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Hi, I’ve got a grizzly 550 eps 2015 and it’s stuck in diagnostic mode once I turn the key on the clocks come on for about 10 seconds then all go off and say diag and none of the buttons work as anyone else had this problem or know where I can get some new clocks thanks
 

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US 2015-20 Yamahas don't allow DIAG mode. Could be stuck buttons or toasted gauge cluster.
I've been researching the EU machine it appear that the ecu maybe the same with one connection not wired that locks us out of diag. I can't get my hands on a EU schematic to verify.
 

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Welcome from Colorado.
On a 550 a couple years older than your's, my buddy had the same thing happening with the gauge after installing a new battery. He did not get the ground wire connection tight, the fix was easy.
 
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