My problem is when I turn on my headlights it shows the left turn signal as being on. What could cause this problem a short in the wire or a bad switch.

 

Wish I knew, I just started having the same issue with my right turn signal!

 

check the turn signal bulbs in the front and rear on the side with the directional light on some vehicles they use that as a bulb out warning

 

My best guess is the switch..

 

Lets narrow it down a little.

How about park lights on, key off?

Does turn signal work, otherwise?

What does left front light look like with turn signal on?

underhood fuse block.. pull left turn fuse. {10 A}

Pull front left park/turn bulb

cycle emerg flash sw a few times.. change?

Wish I coud narrow it down more but alldata diags suck for tracing anything.