The tail light won't work, but the brake light will. Have changed the bulb but still no luck.
Check the socket for power (with a 12 volt test light probe) to the pin that operates the running light bulb filiment, use the other tailight for a guide or just touch all the pins, one should light the test light up
SOURCE: My turn signals and brake lights are not working.
Does your high mount stop light work? If it doesn't, then it'll be the brake switch located just above your brake pedal.
If the light does work, then it should be the electronic flasher module that will be located under your dash near the steering column. It will be labeled. This controls your signals, but I believe your brake lights are also on the same bulb as your signals, so when this goes, it can affect your brake lights
SOURCE: 2003 gmc envoy xl brake lights dont work
sounds like a fuse look under the dash panel for fuse cover look at the back of cover and check that fuseThanks for using fix ya Please rate my response thank you very much
SOURCE: Brake lights quit working.
if all fuses and bulbs are ok get to the brake switch and see ifits stiff or stuck, if it just has two wires on it you could join themtogether to see if the brake lights come on though obviuosly dont leave them joined.Good luck davelee
SOURCE: 2003 gmc envoy xl brake lights dont work
theres usually a pressure switch behind the brake pedal, sometimes the plastic hex nut rattles loose and you have to retighten it.
SOURCE: brake lights won't work. tail lights do. I
need to know if your third brake light up high is working or not.if it isn't,you need to check the brake light switch on the brake pedal with a test light,one side hot all the time,the other side should turn hot when brake pedal is pushed.
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