2003 hyundai tiburon. Left turn signal keeps flashing as long as car is on.

It happens a lot for the Tiburon apparently....what you have to do is put the key in the ignition whilst the horn is going nuts, turn the key to the "on" position and wait a minute or so for the horn to stop blowing. Then press the "unlock" button on the fob until you see the turn signals flash. try turning the key over and see if it will start up. If it doesn't, try again, same thing only turn the key all the way off and try starting as normal again. I can't remember if it's the "unlock" or "lock" button you're supposed to press, but one of them does it. Test it while in the car and see if it locks when you hit lock on the fob.....oh, and also make sure all the doors are shut while you are doing this. It recalibrates the fob to the car's computer and resets your security system and keyless entry.

Unfortunately you need a new bcm, the car will have to go to the dealer. Replacement bcm and reprogram your immobilizer and remotes

yes body control module is at fault .but check jack plugs to rear of bcm as water ingress from poor window seal can cause corroision to terminals

The new marker turn signal lights came with 1 element bulbs and the tiburon takes dual element bulbs . Problem fixed.Cant believe they came that way from the dealer.

Probably a burnt bulb. Turn the signal light on, and check front and back.

Its the BCM. Follow these instructions for a cheaper fix.
DIY: BCM Turn Signal Fix - NewTiburon.com

dear friend-did somebody not fit a double contact globe in a single contact holder.also check and clean the earth points.

The tiburon turn signals are controlled by a bcm (body control module) The bcm controls the ground to the signals. These always go bad and cause the signal to stick on or just not work. hope i was a help.

I just found out today that it is a problem for alot of 2003 tiburons that the flasher relay for the turn signals will go out causing the turn signal lights to stay on even with the car off. The relays are internal and located on the circuit board of the BCM. In order to fix you will have to remove and disassemble the bcm circuit board from it's housing and resolder a new flasher relay. Haven't figured out where to get that flasher relay though.

Bad news, it's your interior relay-fuse controler..... 800$ canadian money installation included at your dealer. I had this bug late
April this year.
I saw the tech change mine, it's so stupid to install, maybe you can buy it and install it your self