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thanks for the replies, will need to check later but from memory the hall sensors were wedged in tight down side of motor, and we had to prise the board up which they're attached to, which caused from memory at least 2 of the sensors to become detached. as you say, doesn't look like rocket science to resolder them, but deffo not convinced i wouldn't make a mess of it, so will try to find somebody else to do it. cheers, col

hi all, my first bafang motor showed the error code for hall sensors (think it was 8, from memory/google). stripped the motor and hall sensors were really tight in their grooves, had to prise the board off that they're attached to, which broke some of the connections to the hall sensors. A bike shop has quoted me £80 to replace each faulty sensor, it was my understanding that the sensors themselves are very cheap (couple of quid) and that they obviously just need soldered onto the board (i'm no solder expert, probably beyond my capabilities). anyone had experience of replacing/buying hall sensors, and either of doing it themselves, or if a shop was involved, how much did it cost ? thanks in advance, colin

thanks all for the input, and it now appears to be fixed. i am one of those lucky few with a spare controller, so i swapped it and it's now done approx 30 miles over 6 or 7 journeys and hasn't missed a beat. interestingly, i'm guessing something in the controller has maybe been on it's way out for a while, as for a long time now the PAS has changed itself sometimes, mostly (maybe entirely) when the throttle is used. this became more frequent over time, and then other things like sometimes the PAS would stop working, throttle would work but no PAS etc. there was a fair bit of white gunk at bottom of controller casing (would guess maybe salt off the roads) and actual moisture on the black connector (silicon from factory at either end of it, so maybe this as opposed to controller itself?). cleaned the white stuff out, and used silicon with the factory gasket , lots of youtube videos mention the factory gaskets are rubbish and water ingress often an issue. cheers, colin

thanks, throttle also causes engine to cut off and on (usually just gives quick 1/2 second burst of power then nothing), not quite sure how to remove PAS from suspect list as it also causes the issue ? my previous motor had hall sensors fault, but it actually showed as an error code, not sure how accurate these error codes are when there's an issue tbh

thanks, should have said i've disconnected throttle, gear change sensor and brake sensor/s one at a time, and the issue was still there using PAS only with no external sensors connected. cheers,

Hi, so are you suggesting it could well be the battery? I can try charging it and see if it behaves when fully charged. Main reason I didn't think it was battery is its a decent quality branded cell battery, and also that the display remains solid, doesn't flicker, doesn't power cycle etc. Which suggested to me the issue lay elsewhere. Cheers

thanks for that, i changed back to original display and the fault was still there, tjhen back to new display and still had the issue. so not sure if just hit lucky for initial test with new display/button pod, weird though that it worked perfectly for a ten minute test where i was off and on throttle, changing PAS etc, yewt next day got literally minutes from the house before it hesitated a few times, then got worse to the point that motor barely cutting in, over a period of a minute or so going from hesitation to mostly not working. i think next step is to replace the controller, as this looks relatively easy from youtube videos. and if it's not that, then gaaaaawd only knows cheers

hi all, so has anyone come across a wonky controller which doesn't show error codes ? looks easy enough to replace and i do have a spare, but would be good to know before spending the time if this is the likely issue, considering i've replace everything else outwith the motor. cheers,

Thanks for replies, no error codes at all. Have literally replaced or unplugged everything apart from battery and motor. The battery was quite a dear one and I would hope its not that, but wouldn't rule it out. I do have a spare motor which had faulty Hall sensors, so could conceivably swap controller. It's only done 400 odd miles, so find it hard to believe anything physically wrong with it, seems fine when it's actually working. Any other suggestions more than welcome, but I think it has the be something in the motor, presumably the controller.... Or maybe battery as u suggest, tho fact display remains constant throughout when motor cutting off and on suggests to me not battery power issue. Cheers

hi all, my bike has now become unuseable, sadly. motor has only done about 400 miles. issue started with the PAS level changing by itself, especially (and probably exclusively) when using the throttle. what then started happening is the motor cutting off and on, sometimes only very briefly, other times the motor cuts and then only briefly cuts on/off again. when it's happening, either the throttle works or it's non-responsive, doesn't seem any pattern to it. on a test drive few weeks back, after dismantling button pod for PAS, it then performed fine until i used the throttle, then PAS would jump about, motor would cut etc. i've swapped out the throttle, main wiring from where motor plugs into it, changed display and button pod, removed battery to check connections etc. and can't find anything that would cause this. if anyone has any ideas at all, they would be much appreciated, as i'm coming to the conclusion it's something in the motor itself as i've replaced almost everything else. i suspect it's not the battery, as the display never flickers/switches off , it remains on whether motor working or not. i suspect if it was a battery power/BMS issue the display would flicker etc. bizarrely yesterday when i fitted new display and button pod, took it for ten min test drive and it performed as expected, not a glitch. yet this morning tried to use it for work and got a few mins from house before motor hesitated a few times, then started cutting out entirely. thanks, colin

good suggestions, thank you, will have a look later to see if the button unit can come apart easily. the wire running from it to the screen, i've normally had a cable tie round it, or light mount (tight), so maybe internal wire/s crushed, causing intermittant issue. so the wire itself is immobile when bike in use, but not to say if a wire issue vibration and knocking isn't causing an issue. i do feel it has to be button unit or display (surely more likely to be buttons or wiring from them to display) as opposed to anything in the motor, as both identical motors have had same issue. fyi its dpc18 display and buttons i have

hi, thanks for the replies. i thought at first it was me hitting buttons by accident, but deffo majority of the times my hands haven't moved off the grips. i've also physically seen the PAS level change on my display without me pressing any buttons. the fact that i had same issue (not as bad tho) with my previous motor would suggest to me that either the display or the buttons are maybe at fault ? the display doesn't show any errors, but it's literally as if you've pressed + or - (sometimes jumps a couple of PAS levels, i have it set to 5). cheers

hi all, i have a strange thing which happens pretty much most journeys on my BBS HD, whereby the PAS level changes by itself. it can go up or down, and it often seems to happen when pulling away using the throttle, though not always. doesn't seem to necessarily happen going over bumps, either. i had a BBS HD motor originally which also occasionally had the same issue, the first motor is in bits with hall sensors needing replaced, so when i bought a new motor the one thing i didn't replace was the display and button cluster (for power on/off, PAS + and -). find it hard to believe 2 motors have the same fault, my current motor only has done about 500 miles, so i would suspect maybe a fault with the display/buttons causing this ? but i really don't know enough about it. any of you helpful folk any ideas at all ? thanks, col