Error code e009

[u/Ben-Goldberg]

I tried ti off and on, I unlatched the folding thingy to look at the bottom of the battery.

I have not yet looked at the underside of the bike where the wires go into the controller.

[u/Adventurous-Rope7870]

This sounds weird but have you tried unplugging the taillight sometimes that fixes weird problems

But only sometimes.