The detent, return or canceling spring is broken, missing, or out of position.

Replace the turn signal switch. Refer to Turn Signal Switch Replacement - On Vehicle .

The switch mounting screws are loose.

Tighten the screws to the specified torque. Refer to Fastener Tightening Specifications .

The turn signal switch is broken.

Replace the turn signal switch. Refer to Turn Signal Switch Replacement - On Vehicle .

The canceling cam to canceling spring interference is uneven.

1. Inspect the canceling cam and the switch.
2. Replace the damaged parts.