The drive cogs been cleaned and greased and have taken out for a test ride , all good for the first mile or so then back to the same fault, does anyone have an understanding of how the pedal assist work on the BBS02 or what switches/ controls the pedal assist? Here’s hoping
I think you already know the answer … the controller is a complex device and with the display head they control the motor,,,
there is little to repair (unless your an electronic tech with surface mount experience..
(and then you will find the unit sealed in silicone.. it is considered disposable.).
I know I mentioned a programming cable first as a way to spot trouble ,,but even If you had the programming cable and all looked good with most of the controller, as it looks in your case part of it,, could fail.with the rest good..
I think at this point, you're going to have to buy a controller- or - take a chance of that cruse control doesn't get's you into trouble...
it is an expensive disposable part and I know you wish you had one lying around to swap out and make sure that is the issue..before you spend $120 on a controller,,,
With most sellers not taking back electronic parts ,,I think you have little choice...replace controller ...or live & possibly die with/from .issue..
I know you want a simple fix......seems like you eliminated all those .. time to bite the bullet maybe...buying a controller for a motor at 800 miles.. ouch...that's gotta hurt...
they just don't have lemon laws in china... Wish they did..I would be a millionaire..
again...good luck..