Yamaha error 31: Torque sensor fault

What it means

The drive unit has detected a torque sensor fault and stopped assist. The display alternates the code with 'TRQ SNSR PWR OFF/ON', which tells you to turn the power off and on. The code is stored for the dealer.

Likely causes

• Torque sensor fault
• Temporary electronic fault

Symptoms

• 'TRQ SNSR PWR OFF/ON' and code 31 on the display
• Assist stops
• Red flashing assist lamps on LED displays

How to fix it

1. Stop in a safe place.
2. Turn the display power off, wait a few seconds, then turn it on again.
3. If the code comes back, stop using assist and have the bike checked by a Yamaha e-bike dealer. Do not open the drive unit or battery.

How urgent is it?

If a power restart does not clear it, see a dealer.

Applies to

• PW-SE / PW series SE
• PW-X / PW-X2
• PW series TE / CE / ST
• Display X
• Display A
• Display C

More Yamaha codes

• 12 Display cannot talk to the drive unit
• 13 Display not compatible with drive unit
• 32 Torque sensor fault
• 33 Torque sensor fault
• 34 Torque sensor fault
• 35 Torque sensor fault

All 28 Yamaha codes →