Shimano STEPS
Motor / drive
W010
Drive unit overtemperature
The drive unit has detected an internal temperature above its normal operating range, typically after long steep climbs in high assist modes or in hot weather. To protect the motor, the system reduces the assist power until the unit has cooled down. This is a protective warning, not a defect.
- Drive system
- Shimano STEPS
- Category
- Motor / drive
- Motor behavior
- assist reduced
- DIY-friendly?
- possible
Roadside self-help
- Take a break and let the motor cool down; do not continue riding with assist enabled until the temperature has dropped.
- Use a lower assist mode on long climbs to avoid recurrence.
- If the warning appears repeatedly without heavy load, have the system checked by a dealer.
Possible causes
- Prolonged riding under high load (steep climbs, high assist mode) high
- High ambient temperature or direct sunlight medium
- Heat dissipation of the drive unit obstructed (dirt, covers) low
Symptoms
- Assist power noticeably weaker than usual
- W010 shown on the display during or after hard climbs
Inspection / repair
- Difficulty: easy
- DIY: possible
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