What would cause the third brake light on a 2003 Chevy Tahoe not to work when all other lights work and how would you replace?
I have same year Tahoe and same problem. Check fuses first to make sure it isn't a fuse. The third brake light assembly can be removed by opening the back door and unscrewing the screws. Then unplug the connector. A new unit is about $175.00 and the whole unit must be replacee as it is LED light not bulbs.
If your brakes lights are not working and all of your other lights are OK try replacing your "brake stop switch". You may have to have either your local auto shop or local dealer replace the switch because it's hard to do yourself. I had the same problem on my Tahoe and replacing the brake stop switch solved it right away.
What causes the tail lights not to work on a 1995 Chevy Tahoe when the turn signal and brake lights do work?
99 Chevy Tahoe none of the left rear lights work replaced the circuit board and bulbs and they still don't work How should I troubleshoot?
What fuse controls the brake lights on a 1984 Chevy camero all lights work except no brake lights when the brake pedal is pushed?
Fuse for the "Third" Brake Light Although I have no experience with the Chevy Tahoe, the systems are similar for almost all vehicles. The third brake light is tied into the wiring for the other brake lights and is protected by the SAME fuse they are. Thus, there is no separate fuse for the third brake light. Therefore, IF your other brake lights are working, then a failure of the third brake light to activate…