Both my turn signals will, what appears randomly, flash faster then return to normal. They can repeat this cycle any number of times or not at all. I asked my husband to to check all the lights and he said they all looked fine/worked. So I don'think it's a bad bulb. I want to say that I notice this more idling at a stop light and it's really hot or really cold outside (either 90 degrees F or 32 degrees F).

What could be causing this?

  • Have you checked the vehicle manual to see whether the behavior is caused by the detection of a fault? Aug 5, 2014 at 16:14
  • You say it's hot, 90 degrees, soooo vehicle temperature could be higher... but it's unlikely its a short circuit of any kind.... I would check with manufacturer... Although it doesnt seem like a problem that could cause any harm.. Aug 5, 2014 at 17:44
  • @TheJavaCoder16 yes, hot. It is only a problem so far as it is extremely annoying!
    – TWhite
    Aug 5, 2014 at 17:45

1 Answer 1


This is symptomatic of a loose or poor earth on the lamps. It may be either the front or the rear earthing point. The other item to consider is the indicator/hazard unit, it may be starting to fail.

  • 2
    In some cars, it's also a sign that one of your bulbs are dead or starting to go. Aug 6, 2014 at 7:00
  • Indeed. Turn on all of your lights, as well as the 4-way blinkers and walk around your car to see which is dead.
    – jsanc623
    Aug 6, 2014 at 15:07
  • 1
    @JuannStrauss Rapid blinking would only indicate a broken bulb if the rapid blinking were constant. Intermittently rapid blinking is, as this answerer suggests, a sign of a ground issue.
    – Paul
    Aug 9, 2014 at 22:29

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