the fuse should be for all brake lights and tail lights if only one is out its a bulb
The 2005 GMC Envoy brake light fuse will be in the fuse box. The fuse box is in the engine compartment. The brake light fuse will be in the second column, third from the top.
Possibly blown fuse, bad brake light switch, or blown brake light bulbs.
Short in the wiring, brake light assembly, or possibly a defective brake light switch.
Blown bulbs, blown fuse, broken or out of adjustment brake light switch.
Tail light assembly short
If an Acura Vigor brake light is not working there are likely two reasons. One is that a fuse is blown and the other is that the bulb is blown. It could be both.
Remove the blown fuse. Replace it with a new fuse.
If your brake light is not coming on, you might have blown a fuse. You might also have a bulb that is no longer working.
Can be a few things. Blown fuse, defective or out of adjustment brake light switch, blown brake light bulbs, loose or corroded wiring, or corroded bulb sockets.
The 2003 GMC Envoy brake light lamp is a 3157. See sources and related links below for more information on bulbs.
The brake light may be blown (bulb) or your brake light switch might not be working.
you can't , have to replace the whole light assembly. call the gm dealer.