Yamaha PW error 64: Circuit board temperature or sensor fault
The drive unit's internal circuit board has either drifted outside its working temperature range, or one of the temperature sensors mounted on the board has started to detach. When this is detected, the controller cuts motor assistance to protect the electronics. The display also stops showing speed and walk assist is unavailable until the fault clears.
| 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 | Dealer diagnostics typically run €40–€80, a board or internal sensor repair €180–€420, and a complete drive unit replacement €700–€1,200 depending on the PW model. |
Likely causes
- Heat soak from long climbs in hot ambient conditions
- Cold soak below the board's operating temperature range
- Loose or cracked solder joint on a board-mounted temperature sensor
- Water ingress past a failed gasket into the drive housing
- Battery or internal connector working loose after heavy vibration
How to fix Yamaha PW error 64
- Switch the display off, wait 30 seconds, then switch it back on.
- Park the bike in the shade between 5 °C and 30 °C until the drive housing is neither hot nor cold to touch.
- Remove the battery, check that the contacts are clean and dry, then refit it firmly.
- Inspect the drive unit seam and display cable for any sign of moisture, cracked sealant, or a pinched wire.
- Power the system up again; if 64 clears, ride normally and watch for it returning.
- If the code comes back the same day or on the next ride, stop using the bike and book a dealer diagnostic.
Warranty: A genuine internal board or sensor fault within the two-year Yamaha warranty is normally covered at no cost, while heat damage from sustained overload, water ingress, or crash damage is treated as owner damage and excluded.
Typical cost: Dealer diagnostics typically run €40–€80, a board or internal sensor repair €180–€420, and a complete drive unit replacement €700–€1,200 depending on the PW model.
Frequently asked
Can I reset Yamaha error 64?
Yes - switch the display off, wait about 30 seconds, then switch it back on. If the system sees no further fault it returns to normal operation.
Is it safe to keep riding with error 64?
No. The controller cuts motor assist for a reason, and the fault can return under load, so ride only briefly to a safe stop before troubleshooting or booking a dealer.
How much does fixing error 64 cost, and is it covered?
Plan on €40–€80 for diagnostics and €180–€420 for a board or sensor repair; a genuine internal fault inside the two-year warranty is usually covered, but heat damage or water ingress is not.
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.