SOURCE: brake lights don't work, singal
you have a bad taillight or a ground problem common problem for the gm trucks
SOURCE: brake lights/rear turn signals
I had the same problem with my 1999 Yukon. The electric board needed to be replaced. Rust starts to build up and shorts out or blows the bulb. The dealership charged $73.60 for the part and I installed it myself (Saved $30).
SOURCE: 2002 yukon no brake lights but third brake light works
ed7882 I had the same exact problem and thought it was a fuse or the wiring. Come to find out it was just a blown bulb. They are inline together with the cruise so if one blows it all goes. So change out the lights and that should fix it for you.
SOURCE: 2005 Yukon XL, third brake light intermittent
Remove bulb, make sure it sits tight in the socket. make sure socket is not burnt up (brown or black in color) Check bulb, if the filament inside is loose or discolored, replace as nesessary. Check brake light switch under driver side dash above brake pedal. make sure it is adjusted correctly.
SOURCE: gmc yukon has the abs & parking brake light
you have to fix the problem with ur brakes- first check the wiring ,connectors and connection clips to the abs sensors and modulator if looks ok than have truck scanned some auto stores such as auto zone / advanced auto do it for free the code will give u a start point towards fixing ur problem--visual inspection of brakes doesnt always show problem
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