you probably have a bulb out or, check the wiring to that bulb if the bulb appears to be okay. If it is neither of those the connector may need to be cleaned. Sometimes they get a little oxidation on them and won't allow the current to pass through to the bulb. Good luck.
Check for a bad socket Turn signal flasher? Switch at steering column?
One of four things can cause a turn signal not to work. Either the turn signal switch assembly, a bad bulb, a bad fuse, or a bad turn signal flasher.
There are many problems that come with owning a car. If a Left rear brake and turn signal do not work, a person should check the fuses, bulbs and wiring.
Did you change the bulb in the rear? Yes. The hazzard lights use the same bulbs in the rear as the turn signals. They work with the hazzards on but not with the turn signal.
Check the fuse, check the bulbs, check the flasher relay.
You could have a faulty bulb. Check for contact in both bulbs if they are new.
Most likely a bad turn signal flasher or blown fuse
have you tryed all the fuses then check if the bulbs are good
If the turn signal bulbs light but will not flash, the flasher relay is defective, replace it.
Is the bulb blown?
Usually when ones turn signal is blinking fast its telling you that a turn signal bulb (and in some cases a brake light bulb) is out. If it blinks fast when you turn on the the left signal the burnt out bulb is on that side of the vehicle (could be front or rear bulb so you'll have to check). And vice versa
The problem is your multi function turn signal switch. It usually controls your High beams, turn signals, and washers, or cruise control. When they go bad all kinds of weird things can happen.