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

Error 502 on Bosch Purion, Intuvia, Kiox, Nyon

What it means + how to fix it From the manual

Quick answer

Error 502 on the Bosch Purion, Intuvia, Kiox and Nyon (before the smart system) means “Bike light fault.” Most likely cause: a fault in a light (headlight or tail light) or its wiring. 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

The system found a problem in a light circuit, such as a broken wire, a short or a failed light. Check the light wiring first. If the code stays, a shop can test the light and controller.

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.

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.
2Check the light wiringEasy Switch off. Unplug the headlight (and tail light, if it has one), then switch on. If the code clears, the light or its cable is shorted or damaged.
3Have 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

As an Amazon Associate I earn from qualifying purchases. These links go straight to Amazon.

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

Rechargeable tail light (USB)
A self-powered tail light that needs no wiring. To replace a built-in tail light instead, match the light voltage your bike supplies.
View on Amazon
Rechargeable bike light set (USB)
The simplest fix if your built-in light has died: a self-powered light that needs no wiring. To replace the built-in light instead, match the voltage your controller supplies (your manual lists it).
View on Amazon

Still not fixed?

Pages to try next:

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

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