How do I fix Bosch error 503?

Switch the eBike system off, wait a few seconds, then switch it on again. Check that the spoke magnet is still on the wheel and lines up with the sensor. If the code comes back, contact your Bosch eBike dealer.

Bosch error code

Bosch error 503: Speed sensor fault

Q: Can I ride with Bosch error 503?

Ride with caution. Assistance may be switched off, but Bosch says you can always keep pedalling without the motor.

Medium severity Service soon

Can I ride home with this error?

Ride with caution. Assistance may be switched off, but Bosch says you can always keep pedalling without the motor.

What it means

The speed sensor is not working properly. Speed readings and assistance may be affected.

Likely causes

Speed sensor or its cable faulty
Spoke magnet missing or moved

Symptoms

Code 503 on the display
Speed shows 0 or wrong
Reduced or no assistance

How to fix it

Switch the eBike system off, wait a few seconds, then switch it on again.
Check that the spoke magnet is still on the wheel and lines up with the sensor.
If the code comes back, contact your Bosch eBike dealer.

Still showing 503? The RideFixer app finds bike shops near you, so you know where to take it.

How urgent is it?

Have the eBike checked before your next ride, as Bosch recommends.

Applies to

Bosch classic system (Intuvia, Nyon, Kiox, Purion, SmartphoneHub)

Did this help?

More Bosch codes

All 123 Bosch codes →