Bosch eBike system error codes (Purion, Intuvia, Kiox, Nyon, before the smart system) · Bosch Purion, Intuvia, Kiox, Nyon

Error 490 on Bosch Purion, Intuvia, Kiox, Nyon

What it means + how to fix it From the manual

Quick answer

Error 490 on the Bosch Purion, Intuvia, Kiox and Nyon (before the smart system) means “Internal fault of the on-board computer.” Most likely cause: an internal fault in the controller or drive unit. Try this first: turn it off and on again.

Try this first

Free, and each takes under 5 minutes.

Turn it off and on again

Code meanings vary by brand. The same number can mean different things on different displays and controllers. Check your bike's manual to confirm.

About the Bosch Purion, Intuvia, Kiox and Nyon (before the smart system)

Bosch prints this same table in the Purion (BUI215) MY2023 US manual (pages English 12 to 14). source
The same table is in the Intuvia (BUI255) MY2021 US manual (pages English 15 to 17). source
The same table is in the Kiox Online Version (BUI330) MY2020 US/CA manual (pages English 35 to 38). source
The same table is in the Nyon Online Version (BUI350) MY2021 US manual (pages English 66 to 69). Bosch notes code 430 does not apply to the BUI350. source
These displays belong to Bosch's older eBike system, not the smart system. The Bosch smart system (for example the Purion 200 and Kiox 400C) uses six-character error numbers instead. source
Bosch also lists "7xx" for faults in third-party parts, and "Display is blank" for an internal fault of the on-board computer. They are not single codes, so they are not in this list. source

In plain English

This code reports a fault in one of the controller's internal circuits. A one-off can clear with a restart. If it keeps coming back, the manual's answer is your retailer or a shop.

Step-by-step checklist

Work from the top. Steps go from free and easy to shop jobs. Switch the bike off before touching any connector. Tick each step as you go. Your progress is saved on this device.

As an Amazon Associate I earn from qualifying purchases. Steps marked "affiliate link" link to Amazon.

1Turn it off and on againFree Switch the display off, wait 30 seconds, then switch it back on. If the code clears, note what you were doing when it appeared, in case it comes back.
2Unplug and check the main connectorsEasy Switch off and remove the battery. Find the round waterproof plugs along the cables (usually near the handlebar, down the frame and near the motor). Pull each one apart, look for bent pins, water, green corrosion or melted plastic. Melted or burnt plastic means stop and see a shop. Clean green corrosion with electrical contact cleaner and let it dry fully, then push the plug back together with the arrows lined up.
Need it? Electrical contact cleaner spray on Amazon (affiliate link)
3Ask a Bafang dealer to read the faultShop job Bafang dealers have a diagnostic tool that reads detailed fault data and can update firmware. It often pins down internal faults quickly.
4Have the controller testedShop job If the wiring checks out, the controller may be faulty. A shop can test it and replace it if needed.

Parts you might need

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Only buy a part if the free steps didn't fix it. Always match the voltage and connector type to your bike.

Electrical contact cleaner spray
Cleans dirt and corrosion from connector pins and battery contacts.
View on Amazon

Still not fixed?

Pages to try next:

When it's time for a shop: if you've worked through every step and the problem is still there, take the bike to an e-bike shop. Bring your notes on when it happens, plus the code.

Words on this page: Controller