Question about 2005 GMC Sierra 1500HD

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2005 gmc sierra brake lights won't work

Brake lights won't work all other lights do. bulbs are not burned out what can be the problem

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Hi and welcome to FixYa,

Your particular vehicle is not that common in my country. However on similar incidents, possibilities are:

  • a faulty brake switch (above the brake pedal) (least likely);
  • a blown fuse (likely);
  • loose ground in the brake light wiring/harness (most likely). One way to test is to temporarily install a jumper wire from the body/housing of the bulb socket to any exposed metal/screw;
  • open wire/connector along the harness from the engine compartment to the rear (a possibility).
To test for the presence/absence of voltage when the brake pedal is stepped on, a test light is preferred rather than a DVM/VOM.

Good luck and thank you for using FixYa.

Posted on Feb 13, 2009

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