Cranks but wont start (this happened suddenly the bike has gas and a new battery and 3k miles)

https://www.engine-codes.com/U0156.html

I have found several bikes problem at the computer connector.

Your float in your carburator is stuck closed due to old gas or if your bike is fuel injected then it is likely clogged fuel injectors. Check you spark plug for spark first and if all is good, start working on cleaning the fuel system.

Best Regards,
Kevin

Replace with new spark plug.

Sounds like fuel pump is out and know there's not a reset best I can remember

what year and model yamaha do you have and the engine? We need to know that information first.

If the batterys seem low you should get a batery tender. If they act like they're just not getting enough gas. Pull the throttle a few times to make sure gas is getting to the cylinder, try cranking it as you are pulling the throttle on the first couple of pulls then let it set a few seconds then start it, it should crank.

The most likely cause is the fuel pump controller. It is positioned under the cover just left of your instrument cluster, on top of the fuel tank. These units are not repairable and it will need to be replaced. this is what it looks like.

starter solenoid sounds like it jamming knock itaround and

Don't rely on on whether the bike will start at a gas station to determine if the charging system is working. Get the multimeter out and do a proper test. Should be getting about 14.5 volts @ around 3K RPM. It's too easy of a test to to just skip. If it is charging then start looking for something else. Was the new battery properly charged to begin with? Loose battery connection? I suppose the GPS could be too much but you said that it was dying last november, so I would suspect something else. P.S. you need a properly charged battery to get an accurate reading for the charging test.

though if it was a problem it would have blown the 10amp fuse????Don't rely on on whether the bike will start at a gas station to determine if the charging system is working. Get the multimeter out and do a proper test. Should be getting about 14.5 volts @ around 3K RPM. It's too easy of a test to to just skip. If it is charging then start looking for something else. Was the new battery properly charged to begin with? Loose battery connection? I suppose the GPS could be too much but you said that it was dying last november so I would suspect something else. P.S. you need a properly charged battery to get an accurate reading for the charging test. ,,,