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Thanks for that info I was suspecting the same. I am thinking a BMS problem really since the batt holds a charge. I should know more later this week thanks again.

My problem is a little different it shuts down whether there is a load or not. Even if I just let it sit in about 10 or 15 seconds it shuts down then it is dead until I disconnect then reconnect the battery.Then it will come back on for 10 seconds or so to repeat over. All this electric bike...

Ok thanks for the info. I am going to go through everything since it has 3000 mi on it. Maybe ordering a speed sensor or two is a good start. Thanks for the help I will repost an update when I have more information to share.

everything I read on er 21 you still have throttle just no display I have nothing. I am not sure what the amps are the voltage is topped at 54 it is a 20aH battery also I only get er 21 once in a while then the display shuts off. most often since testing today the display just shuts down and I...

I have a BBS02 750 watt I have been riding for over a year now just about 3000 miles with very few problems along the way a few connection and wiring problems due to bad connectors. Recently I have an electrical problem I cant figure. WHen I power it on sometimes I get er 21 though most of the...