You need to replace the bulbs. these bulbs are like a 2 or 3 way light bulb found in ones house lamp. one setting may be blown but the other still works
Set the parking brake, the DRL should go off.
As soon as you start the vehicle ( and parking brake is released) they automatically come on (Helpfull)
in middle of dash large square button with red triangles push it and you will activate your flashers
The 2005 GMC Sierra-2500HD has 16 valves.
The 2005 GMC Sierra-1500 has 12 valves.
The 2005 GMC Sierra-2500HD has a V8 engine.
The 2005 GMC Sierra-1500 has a V6 engine.
The 2005 GMC Sierra-1500 has overhead valves (OHV).
The 2005 GMC Sierra-2500HD is a gas-powered vehicle.
La sierra - 2005 is rated/received certificates of: Brazil:14
The 2005 GMC Sierra-1500 is a gas-powered vehicle.
The 2005 GMC Sierra-2500HD has overhead valves (OHV).