Bosch error 511: Internal fault in the drive unit
Another internal drive unit error code in the 500 family. It reports a fault inside the motor that the rider cannot fix; a restart may clear it temporarily.
Likely causes
- Internal electronics fault
- Moisture or corrosion inside the drive unit
- Sensor failure
- Overheating damage
- Firmware issue
How to fix Bosch error 511
- Power cycle the system with the battery removed for a minute
- Let the bike dry if wet
- Test ride and note when the code returns
- If repeating, book a dealer diagnosis with DiagnosticTool
Warranty: Bosch drive units, batteries and displays carry a 2-year manufacturer warranty in most markets; a genuine internal fault within that period is normally replaced free through the dealer.
Typical cost: Drive unit exchange 500-1000 EUR/USD out of warranty; independent repair often 200-400 EUR/USD.
Frequently asked
Can I reset Bosch error 511 myself?
Only by restarting; a repeating 511 has to be diagnosed at a dealer.
Can I keep riding with error 511?
Usually, but with reduced or interrupted assistance and the risk of the system shutting down mid-ride. Ride home carefully or on muscle power alone; do not plan long rides until the cause is found.
Is error 511 covered by warranty?
Bosch drive units, batteries and displays carry a 2-year manufacturer warranty in most markets; a genuine internal fault within that period is normally replaced free through the dealer.
Related Bosch codes
Not an official Bosch document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.