Home › Diagnosis
Diagnose it yourself, step by step
Battery, charger, motor, sensors, display, resets. Work through the checks in order and you will know what is broken before you pay for a diagnosis.
Battery
E-bike battery dead: find out what is actually brokenAny e-bikeE-bike range dropped or percentage jumps: worn pack, bad BMS, contact or cold?Any e-bikeBosch PowerPack or PowerTube not working: LED patterns, deep-discharge and errors 530, 602, 603Bosch PowerPack / PowerTubeShimano STEPS battery not working: BT-E6000/E6010/E8010/E8020/E8035/E8036 LED patterns and errorsShimano STEPS BT-EYamaha or Giant EnergyPak battery not working: LED patterns, EnergyPak Smart, charging errorsYamaha / Giant EnergyPakBafang, Hailong and generic e-bike battery not working: key switch, fuse, BMS, connectorsBafang and generic hub-motor packsVanMoof battery not charging or bike dead: what you can check, what you cannot, and your optionsVanMoof S3 / X3 / S5 / A5Specialized Turbo battery not working: TCU LED patterns, Mission Control health and recoverySpecialized Turbo (Brose)E-bike battery swollen, hot, smelly or wet: stop-immediately safety flowAny e-bikeE-bike battery will not turn on after winter or long storage: recovery flowAny e-bikeHow to test e-bike battery health yourself: capacity, sag, charge time, app SOHAny e-bike
Charger
E-bike charger LED meanings and not-charging flowAny e-bike chargerBosch charger not charging: 2A, 4A, 6A and Smart System chargersBosch eBike SystemsShimano STEPS charger EC-E6000, EC-E6002, EC-E8004 not chargingShimano STEPSYamaha and Giant EnergyPak charger not chargingYamaha / Giant EnergyPakSpecialized Turbo charger not charging: Levo, Vado, Como, Creo, KenevoSpecialized TurboGeneric e-bike charger stays red, green immediately, or dead: 36V, 48V, 52VGeneric 36V / 48V / 52V chargerVanMoof S3 / X3 / S5 / A5 charger and charge port not chargingVanMoofE-bike charges to 80-90 percent and stops, never reaches 100Any e-bikeE-bike charging takes much longer than it used toAny e-bikeE-bike charge port bent, burnt or looseAny e-bike
Which motor do I have?
Which motor is on my e-bike? Identify it in five minutesAny e-bikeWhich Bosch system do I have: Classic, system 2 or the smart system?Bosch eBikeWhich Shimano STEPS system is on my bike?Shimano STEPSYamaha PW or Giant SyncDrive: which motor is it really?Yamaha PW / Giant SyncDriveBafang, Ananda, Dapu or a no-name controller: telling cheap systems apartBafang and generic hub systemsSpecialized Turbo or Brose: which error list applies to my bike?Specialized Turbo and Brose
Motor & controller
Is my hub motor dead? Elimination test: motor vs controller vs display vs sensor vs batteryHub motors (Bafang, generic, Rad, Aventon, ADO, Fiido, Engwe, Himiway)Is my mid-drive motor dead? What you can check at home before the dealerMid-drive motors (Bosch, Shimano, Yamaha, Brose, Bafang M-series)Bafang BBS01 / BBS02 / BBSHD no power or cuts out: find the faultBafang BBS01/BBS02/BBSHDE-bike motor noise: grinding, clicking, knocking, whining and what each one meansAny e-bikeE-bike stopped working after rain, washing or a pressure washer: dry-out and recovery flowAny e-bikeHow to test an e-bike controller and choose a matching replacementHub-motor and generic e-bikes
Sensors
E-bike speed sensor problems: no assist, assist cuts at speed, speed shows 0Any e-bikePedal assist not working on a hub-motor e-bike: PAS cadence sensor testHub-motor e-bikesWeak or surging assist on a torque-sensor e-bike: calibration and fault findingTorque-sensor e-bikes
Brakes & cut-off
Throttle
Display
E-bike display stays black: battery, cable, backlight, or dead displayAny e-bikeDisplay works but no assist and no error code: display, controller, motor, battery comms or settings?Any e-bike
Resets
E-bike reset explained: soft reset, power cycle, settings reset, factory reset and dealer resetAny e-bikeBosch eBike reset (Purion, Intuvia, Kiox, Nyon): power cycle, display reset and what a dealer can clearBosch (BES2 classic: Purion, Intuvia, Kiox)Bosch Smart System reset: restart, Flow factory reset, unpair, delete the eBike and dealer resetBosch Smart System (Purion 200, Intuvia 100, Kiox 300/500, LED Remote, Flow app)Shimano STEPS reset: power cycle, display reset, E-TUBE Project defaults, error log and E-TUBE Ride unpairingShimano STEPSYamaha PW and Giant SyncDrive reset: display reset, RideControl app unpair and dealer resetYamaha / GiantBafang reset: display defaults, service menu password, parameter reset via programming cable (with warning) and error memoryBafang (DP C18, 850C, C961; BBS motors)KT LCD3, LCD8, S866, S830 and SW900 reset: safe default P and C parameters, service codes and what to write down firstKT LCD3/LCD8, S866/S830, SW900VanMoof S3, X3, S5 and A5 reset: app reset, restart sequence, factory reset, transfer and life after the bankruptcyVanMoof S3/X3/S5/A5Cowboy e-bike reset: app reset, bike restart with the battery, factory reset and ownership transferCowboySpecialized Turbo reset: TCU reset, Mission Control unpair, Mastermind factory reset and dealer resetSpecialized Turbo (TCU/Mastermind, Mission Control)Rad Power, Aventon, Lectric and Ride1Up reset: display defaults, settings menu, Aventon app reset and controller power cycleRad Power, Aventon, Lectric, Ride1UpE-bike app pairing reset: Bluetooth reset flow and what to do when a second-hand bike is still linked to the previous owner (per brand)Any e-bike with an appCan you reset an e-bike odometer? Trip yes, total usually no, and the red flags on a second-hand bikeAny e-bike