Yamaha PW error 33: Torque sensor voltage error while riding
The controller has measured a torque sensor signal that drifts outside its expected voltage window while you are pedalling under load. As a result the drive unit shuts motor assist off, the display typically drops speed to zero, and walk assist is disabled until the fault clears. The bike can still be pedalled home unpowered, but power will not return without rectification.
| Drive system | Yamaha PW series (PW-X3, PW-S2, PW-ST, PWseries CE - also Giant SyncDrive) |
| Severity | Dealer needed |
| Keep riding? | Do not keep riding |
| Typical cost | Expect roughly 60 to 120 EUR for diagnostics and a reference voltage adjustment, around 180 to 350 EUR for a torque sensor replacement including labour, and 350 to 600 EUR if the controller assembly needs to be swapped. |
Likely causes
- Corroded or wet torque sensor connector at the bottom bracket or controller
- Damaged wiring between the torque sensor and the controller from a stone strike or cable rub
- Torque sensor reference voltage drift due to age or moisture ingress
- Internal controller ADC fault reading the torque signal incorrectly
- Impact or crash damage to the crank, spider or bottom bracket area affecting the sensor
- Loose controller ground causing a floating reference voltage
How to fix Yamaha PW error 33
- 1. Stop riding, switch off the system and remove the battery. 2. Inspect the torque sensor connector at the bottom bracket for moisture, bent pins or green corrosion; clean with contact cleaner and dry thoroughly. 3. Inspect the cable run from the sensor to the controller for chafing, crushed sections or pulled pins. 4. Reconnect everything firmly, refit the battery and power the bike on to see if the code clears. 5. If the code returns under load, the controller needs a torque sensor reference voltage adjustment performed on the bench. 6. If adjustment does not hold, the torque sensor or controller assembly must be replaced by a Yamaha authorised dealer.
Warranty: A genuine component failure on the torque sensor or controller within the original two year warranty period is normally covered, whereas water ingress, crash damage and wear-related corrosion are excluded.
Typical cost: Expect roughly 60 to 120 EUR for diagnostics and a reference voltage adjustment, around 180 to 350 EUR for a torque sensor replacement including labour, and 350 to 600 EUR if the controller assembly needs to be swapped.
Frequently asked
Can I reset yamaha error 33?
Switching the system off, waiting thirty seconds and powering it back on will clear the code if it was caused by a transient wiring glitch. If the code returns the moment you apply pressure to the pedals, the fault is still active and a dealer diagnostic is required.
Is it safe to keep riding with error 33?
No. Motor assist cuts off while the code is active, leaving you with an unpowered bike and unpredictable power delivery if it briefly returns. Ride without assist to the workshop or home, then book the service.
How much will the repair cost and is it under warranty?
Out of warranty the repair lands between roughly 60 EUR for an adjustment and up to 600 EUR for a controller replacement, parts and labour included. On a bike under two years old with no signs of water damage or impact, Yamaha or Giant usually cover the faulty component.
Related Yamaha PW codes
Manuals and video
Official source: cdn2.yamaha-motor.eu
Not an official Yamaha PW document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.