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1. • • Err 21 - Current sensor issue The current measurement is out of range. Disconnect all wires, and then reconnect all wires, to make restart the charger. Also, make sure the minus on the MPPT charge controller (PV minus/Battery minus) is not bypassing the charge controller. This error will not auto-reset.
     www.victronenergy.com/live/mppt-error-codes

     MPPT Solar Charger Error Codes - Victron Energy

2. www.youtube.com › watchXiaomi Scooter 2 Pro - error 21 - Communication error with ...

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   If your Xiaomi Scooter 2 Pro (or other similar) have error 21, which is communication error with the BMS, check resistors on controller.

   • Video Duration: 1 min
   • Views: 4.9K

   • Author: swenak

3. scootertalk.org › forum › viewtopicBMS communication error 21 after flashing - Scooter Talk

   scootertalk.org › forum › viewtopic

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   Aug 26, 2021 · Resetting the battery via the button on the BMS. regular M365 original battery - still gives error 21. Flashing all original softwares through scooterhackingutility, down-g and xiaoflasher. Charging the battery with and without the controller. Battery cells are all equally charged.

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4. www.reddit.com › r › ElectricScootersAny Idea what should I do with error 21 on xiaomi m365

   www.reddit.com › r › ElectricScooters

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   Take the lid off and make sure that the BMS communication wire (three narrow wires going from the battery to the side of the controller; not the big red and black main power connection) is correctly plugged in. Unplug it and plug it back in, you never know.

5. www.reddit.com › r › m365How to fix error code 21 on Mi Scooter Pro? : r/m365 - Reddit

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   I had error code 21 when I installed an aftermarket battery with no data cable. Just had to disable the bms communication in the scooter hacking utility app. This may help you.

6. www.segwayforums.com › threads › error-code-21Error code 21 - Segway Forum

   www.segwayforums.com › threads › error-code-21

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   Apr 17, 2021 · Often error 21 is caused by a disconnected BMS cable. Regardless, this error indicates that the ESC/DRV is not able to communicate with the BMS. This can happen if the BMS/battery is dead or if the cable has come unplugged.

7. fallman.tech › xiaomi-m365-error-codesXiaomi M365 and M365 Pro Electric Scooter – Error Code List

   fallman.tech › xiaomi-m365-error-codes

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   Jul 23, 2024 · If the Xiaomi M365 or M365 Pro electric scooter soundly stops working while riding and starts beeping, then it indicates that an internal error has happened. Down below is the complete list of the errors that can happen and how to decode the problem.

8. People also ask

   How do I fix BMS error code 21?

   • I had error code 21 when I installed an aftermarket battery with no data cable. Just had to disable the bms communication in the scooter hacking utility app. This may help you. Disable then upload normal software again to get bms back. (scooter still connects via Bluetooth when error 21 code flashing)

   How to fix error code 21 on Mi Scooter Pro? - Reddit

   www.reddit.com/r/m365/comments/vd5nt2/how_to_fix_error_code_21_on_mi_scooter_pro/

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   Can a failed BMS firmware Flash cause error 21?

   • A failed BMS firmware flash can also cause Error 21. Check the 4 pin data cable and confirm it is firmly in place. If the cable is fine, check for the blinking blue or red led on the top of the battery and make sure that it is blinking. If it is not, plug in the battery and attempt to charge it.

   Error code 21 - Segway Forum

   www.segwayforums.com/threads/error-code-21.84/

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   What causes error 21 on ESC/DRV?

   • Often error 21 is caused by a disconnected BMS cable. Regardless, this error indicates that the ESC/DRV is not able to communicate with the BMS. This can happen if the BMS/battery is dead or if the cable has come unplugged. A failed BMS firmware flash can also cause Error 21. Check the 4 pin data cable and confirm it is firmly in place.

   Error code 21 - Segway Forum

   www.segwayforums.com/threads/error-code-21.84/

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   Is the BMS OK?

   • And as another original battery from a working M365 gives the same error with only v3.0 board and my battery still takes charge in and gives it out, I can say that the BMS itself is ok and battery itself too. The BMS starts blinking fast green when both boards are connected like it would be communicating.

   BMS communication error 21 after flashing - Scooter Talk

   scootertalk.org/forum/viewtopic.php?t=29097

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   How do I know if my BMS is dead?

   • If the charger is blinking red briefly and green most of the time, leave it plugged in for a few hours until the battery is able to charge to 100%. If the charger light is green and does not change, the BMS is likely dead. If the battery charges fine but the error is still present, the BMS will need to be flashed again.

   Error code 21 - Segway Forum

   www.segwayforums.com/threads/error-code-21.84/

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   Can I disable BMS communication in a CFW?

   • Yes, you can disable the BMS communication in a CFW, but in this case it might be risky. Maybe the BMS is fine except for the communication part, maybe it's damaged and could cause a flaming inferno if left unchecked, I'm not sure I would want to take the gamble.

   How to fix error code 21 on Mi Scooter Pro? - Reddit

   www.reddit.com/r/m365/comments/vd5nt2/how_to_fix_error_code_21_on_mi_scooter_pro/

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9. www.reddit.com › r › ElectricScootersXiaomi M365 error code 21 - how to repair? : r/ElectricScooters

   www.reddit.com › r › ElectricScooters

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   Couple of weeks ago it started beeping the error code 21, which seems to be a BMS communication error. It turns on after charging but starts to beep and turns itself off after a couple of minutes of driving. I have googled some repair instructions and tried following: