Yamaha PW-X/PW-X2/PWseries — Error Code 15
Reviewed by certified eBike technicians · Last updated July 30, 2026
Quick Answer
15 on Yamaha = Torque sensor calibration error — sensor reading out of range or signal lost
Severity: Stop — no pedal assist · Do NOT continue riding
⚠️ STOP RIDING — This error indicates a critical safety issue. Continuing to ride may cause battery damage or safety hazard. Stop and diagnose before continuing.
Error 15 on your Yamaha indicates: Torque sensor calibration error — sensor reading out of range or signal lost.
Stop — no pedal assist — Torque sensor calibration error — sensor reading out of range or signal lost
Symptoms
- Error 15 on Yamaha display; motor provides no pedal assist; throttle (if equipped) may still work; assist level display frozen
Common Causes
- Torque sensor magnet damaged or displaced from crank axle
- Sensor wiring pinched at crank axle exit point
- Corrosion in torque sensor connector
- Sensor calibration drift after years of use
- Impact on crank arm damaging sensor mechanism
Fix Steps
Step 1: 1. Power off bike and remove battery
Step 2: 2. Check crank axle area for visible damage — torque sensor is inside the axle
Step 3: 3. Unplug and replug the torque sensor connector (usually near motor housing)
Step 4: 4. Check sensor wiring for pinch marks or cuts — common failure point
Step 5: 5. If no visible damage: perform torque sensor recalibration at Yamaha dealer (~$50 diagnostic)
Step 6: 6. Yamaha torque sensors are sealed units — cannot repair, only replace (~$180-250)
Step 7: 7. Temporary workaround: use throttle only if equipped, until sensor is fixed
Related Error Codes
Error 09
Speed sensor signal abnormal — rear wheel speed signal lost or erratic during operation
Error 11Motor system error — internal drive unit fault or controller failure
Error 12Speed sensor error — wheel speed signal lost or erratic
Always disconnect the battery before inspecting wiring.