Question 1

What does error code Bosch Error 503 (523001) u Bosch eBike / Bafang / Shimano mean and how to fix it?

Accepted Answer

Speed sensor fault – no signal detected from the rear wheel magnet. Troubleshooting & fix: Align the spoke or brake rotor magnet on the rear wheel so it passes the sensor mark at a gap of 5 – 12 mm; inspect the sensor cable along the chainstay for damage.

Question 2

What does error code Bosch Error 500 / 510 u Bosch eBike / Bafang / Shimano mean and how to fix it?

Accepted Answer

Internal fault in Bosch Performance Line mid-drive motor or torque sensor. Troubleshooting & fix: Restart the Kiox / Purion / Intuvia display with your feet off the pedals; if the fault persists, inspect the motor plugs for moisture ingress and update firmware via Bosch diagnostics.

Question 3

What does error code Bosch Error 610 / 640 u Bosch eBike / Bafang / Shimano mean and how to fix it?

Accepted Answer

PowerTube / PowerPack battery voltage error or BMS communication fault. Troubleshooting & fix: Remove the battery from the e-bike frame, clean the power and data pins with contact cleaner spray, apply terminal grease, and fully charge the pack using the genuine charger.

Question 4

What does error code Bafang Error 21 (21H) u Bosch eBike / Bafang / Shimano mean and how to fix it?

Accepted Answer

Speed sensor fault – motor cuts pedal assist after riding a short distance. Troubleshooting & fix: Shifted spoke magnet on the rear wheel (align it with the arrow on the sensor within 5 mm) or a loose 3-pin waterproof Higo connector on the Bafang motor.

Question 5

What does error code Shimano Steps W011 / E010 u Bosch eBike / Bafang / Shimano mean and how to fix it?

Accepted Answer

Speed sensor warning (W011) or pedal pressure detected during power-on initialization (E010 / W013). Troubleshooting & fix: Never rest your foot on the pedal when turning on the battery power button (zero-torque calibration!); for W011, clean the rear rotor magnet and inspect the EW-SS300 speed sensor.

E-Bike Error Codes: Bosch (503, 500, 610), Bafang (Error 21) & Shimano (W011, E010) – Error Code Meaning, Troubleshooting & Repair

Error Code Reference Table for Bosch eBike / Bafang / Shimano and step-by-step repair procedure:

Error Code	Meaning / Fault Symptom	Most Common Cause & Repair Procedure
Bosch Error 503 (523001)	Speed sensor fault – no signal detected from the rear wheel magnet	Align the spoke or brake rotor magnet on the rear wheel so it passes the sensor mark at a gap of 5 – 12 mm; inspect the sensor cable along the chainstay for damage.
Bosch Error 500 / 510	Internal fault in Bosch Performance Line mid-drive motor or torque sensor	Restart the Kiox / Purion / Intuvia display with your feet off the pedals; if the fault persists, inspect the motor plugs for moisture ingress and update firmware via Bosch diagnostics.
Bosch Error 610 / 640	PowerTube / PowerPack battery voltage error or BMS communication fault	Remove the battery from the e-bike frame, clean the power and data pins with contact cleaner spray, apply terminal grease, and fully charge the pack using the genuine charger.
Bafang Error 21 (21H)	Speed sensor fault – motor cuts pedal assist after riding a short distance	Shifted spoke magnet on the rear wheel (align it with the arrow on the sensor within 5 mm) or a loose 3-pin waterproof Higo connector on the Bafang motor.
Shimano Steps W011 / E010	Speed sensor warning (W011) or pedal pressure detected during power-on initialization (E010 / W013)	Never rest your foot on the pedal when turning on the battery power button (zero-torque calibration!); for W011, clean the rear rotor magnet and inspect the EW-SS300 speed sensor.