Shimano STEPS
Motor / drive
W100
Drive unit overtemperature (EP8 generation)
The EP8-generation counterpart to W010: the drive unit has become hotter than its normal operating range, typically from sustained high load, and the system temporarily limits assist power. After a cooling break the warning clears by itself. No repair is needed unless it occurs repeatedly under light load.
- 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 before continuing.
- Ride in a lower assist mode on sustained climbs.
Possible causes
- Long climbs in high assist modes high
- High ambient temperatures medium
Symptoms
- Assist power drops during long, hard climbs
- Warning disappears after a cooling break
Inspection / repair
- Difficulty: easy
- DIY: possible
- no dealer tool needed
- Component: drive unit
Applies to
EP8