Could be a bad bulb. The same bulb has two filaments, one for the tail lights and one for the brake lights.
2001 GMC Savanna Van Daylight running lights. Do I need to disable the daylight running lights so I can install HID lighting system, for it to work?
How do you get light to turn off on 2001 GMC Sierra coolant light is staying on even after topped off
The 2001 GMC Yukon has 16 valves.
The 2001 GMC Yukon has a V8 engine.
The 2001 GMC Yukon has overhead valves (OHV).
The 2001 GMC Yukon is a gas-powered vehicle.
The 2001 GMC Yukon has a 4-speed automatic.
The height of the 2001 GMC Yukon is 6 ft. 4.7 in. (76.7 in.).
The 2001 GMC Yukon-XL has 16 valves.
The 2001 GMC Yukon's turning circle is 38.3 ft..
The 2001 GMC Yukon-XL has a V8 engine.
The 2001 GMC Yukon is 16 ft. 6.8 in. (198.8 in.) long.