It could be the bulb(s), or possibly a faulty connection but if all bulbs are ok, it's probably the turn signal.
check for an open fuse or check the vss (vehicle speed sensor)
There are several red flags that can indicate overdrive is not working on an automatic vehicle. If a car is shifting in and out of gear or out of overdrive is usually the first signal of a problem. Other signals include low fluid levels and and erratic temperature sensor.
im not familair with that make of vehicle but. the brake lights anf the signals are supposed to be separte. they both plug into a harness near the back of the vehicle. if your brake lights are working with your signals, you might have something crossed. take it to an expert you trusst and let them check it out.
If a Passat 04 TDI's indicator lights are not working, check the fuse. A blown fuse can cause the lights to stop working.
The 2000 Hyundai Excel indicator light and brake light might stop working all of a sudden because of a burned out bulb. Check all bulbs on the brake lights and turn signals. This problem could also be caused by a blown fuse or a blown flasher fuse.
if only the turn signals are not working,you should replace the flasher can
If the traffic signals do not work, it is to be treated as a four-way stop sign. It says so in the vehicle code.
Turn left indicator signal flashes rapidly when I use indicator, bulbs ok, no lights working
If the turn signals in the dash don't work, what about the outside front and rear turn signals? Working? Not working? If it's not working, replace the turn signal relay under the dash.
See answer for same question on 2004 Chevy avalanche. JIT
vss sensor
no they are not