E10 on the GOTRAX Fitz16 electric dirt bike means “Communication failure.” Most likely cause: the display, controller and battery have stopped talking to each other properly. Try this first: switch off and restart.
Gotrax's page words this as "over communication failure".
The parts of the bike share data over a communication cable. This code means that link was lost. A restart sometimes clears it. If it stays, a dealer can check the connections.
Step-by-step checklist
Work from the top. Steps go from free and easy to shop jobs. Switch the bike off before touching any connector. Tick each step as you go. Your progress is saved on this device.
When it's time for a shop: if you've worked through every step and the problem is still there, contact an authorized dealer for your brand. Bring your notes on when it happens, plus the code.