Bosch · Motor
440 Bosch error code 440
Internal drive-unit fault
Per manufacturer documentation
Note
Bosch classic system (Intuvia/Nyon/Kiox/Purion). Smart System codes differ.
Possible causes
General, component-based causes – not a manufacturer-specific statement.
- Motor overload/overheating
- Internal motor fault (sensor, winding, mechanics)
- Motor cable/connector fault
Safe test steps
- Inspect motor cable and connector; free rotation unpowered.
- Fault conditions: temperature, climb, load.
Workshop reference values
- No general documented measurement value – manufacturer service documentation required.
Repair approach
- Reduce load, retest after cooling; persistent fault: dealer service.
- Do not open a mid-drive without the manufacturer procedure.
Tools needed
- Digital multimeter (CAT III, fused inputs)
- Manufacturer dealer diagnostic tool/software (if available)
- Basic hand tools, insulated screwdrivers
Safety
- For tests with a spinning wheel use a secure work stand with the driven wheel raised.
This information does not replace manufacturer service documentation. Work on batteries and high-voltage parts only with the appropriate expertise.