Check for a burned out bulb or could be the turn signal flasher going bad
It has been my experience that a rapid turn signal indicates there is a burnt-out signal light bulb (either front or rear) on the side of the rapid blinking signal. If the right signal is blinking rapidly, the problem is in the signal lights for the right side (front or rear) of the vehicle. Turn the rapid signal on and step out of the vehicle to find which bulb is not lighting.
If it's blinking, it's a turn signal.
Defective turn signal switch.
Where is the turn signal flasher on a 2002 impala
Defective flasher relay.
it needs to be replaced
change the flasher to a slower blinking brand. They are cheap and you can try a few brands
One reason why the turn signal will not stop blinking is the clock spring. This is something that many people replace themselves. Another possible cause of this problem could be the switch needing to be replaced.
where is turn signal flasher 2002 nissan frontier
Turn signal lights that double as parking (marker lights) when not blinking.
Usually, a fast blinking turn signal means one of the outside turn signals (front, back and side) lights is burned out.