Yamaha PW error 68: Encoder lead wire disconnected or short-circuited
The controller has lost the signal from the motor's encoder, which reports rotor position and speed. Because the system cannot trust that signal, it shuts motor assist down immediately. The display typically shows zero speed, pedal assist is disabled, and walk assist no longer works until the fault is cleared.
| 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 €80–150 for an encoder lead replacement, €200–400 for a controller, and €500–900 if the full motor assembly is required, plus labour. |
Likely causes
- Corroded or moisture-fouled encoder connector at the motor housing (most common after wet weather or washing)
- Chafed or pinched encoder lead where the loom exits the motor and enters the frame
- Damaged encoder inside the motor, often after a heavy impact or prolonged water ingress
- Connector not fully seated after a recent service or wheel removal
- Controller board fault that fails to read an otherwise good encoder signal
How to fix Yamaha PW error 68
- Switch off the system and remove the battery before any inspection.
- Locate the encoder connector on the motor housing (small multi-pin plug near the axle area on most PW motors).
- Unplug the connector and inspect the pins for green corrosion, bent pins, or moisture; clean with contact cleaner and dry fully if wet.
- Inspect the visible section of the encoder lead for chafing, cuts, or pinch marks along the frame and at the motor grommet.
- Re-seat the connector firmly, refit the battery, switch the bike on and check whether the code clears.
- If the code returns immediately, stop riding and take the bike to an authorised Yamaha dealer.
- Dealer replaces the encoder lead, the controller, or the motor assembly as the official repair, then confirms the fault is gone with a diagnostic read.
Warranty: A genuine component failure of the lead, controller or motor within the typical two-year warranty period is normally covered, while water ingress, crash damage and worn connectors from poor maintenance are usually excluded.
Typical cost: Expect roughly €80–150 for an encoder lead replacement, €200–400 for a controller, and €500–900 if the full motor assembly is required, plus labour.
Frequently asked
Can I reset yamaha error 68?
There is no user reset that clears this code; turning the bike off and on will not fix a true encoder fault. A power cycle may temporarily clear the warning if the connector was simply loose, but if it returns the cause must be repaired.
Is it safe to keep riding with error 68?
No. The motor assist cuts out without warning, which is dangerous on hills or in traffic, and the walk-assist function is also disabled, so a loaded bike becomes very hard to move uphill.
How much will the repair cost and is it under warranty?
Budget €80–150 for a lead, €200–400 for a controller, or €500–900 for a motor assembly, plus workshop labour; if the part failed on its own within two years and there is no sign of water damage or impact, Yamaha or the bike brand typically covers it under warranty.
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.