Shimano STEPS
Sensors
W103
Torque sensor initialization failed (EP8 generation)
The EP8-generation counterpart to W013: the torque sensor could not finish its self-calibration at startup, usually because the pedals were loaded when the system was switched on. Assist remains weaker than normal until initialization succeeds. Rotating the crank backwards a few times or restarting without pedal load normally clears the warning.
- Drive system
- Shimano STEPS
- Category
- Sensors
- Motor behavior
- assist reduced
- DIY-friendly?
- possible
Roadside self-help
- Rotate the crank backwards two to three times.
- Switch the system off and on again without touching the pedals.
- If the warning keeps returning, contact your dealer.
Possible causes
- Load on the pedals while switching on high
- Sensor self-calibration interrupted medium
- Persistent torque sensor defect low
Symptoms
- Weaker assist than usual right after startup
- Warning shown on display or in the app
Inspection / repair
- Difficulty: easy
- DIY: possible
- no dealer tool needed
- Component: torque sensor
Applies to
EP8