Question about 2005 GMC Yukon Xl Denali

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2005 Yukon XL, third brake light intermittent

2005 Yukon XL, inspection today said third brake light not working. Turns out it does work most of time (just not when in front of inspection experts!) What could be causing the intermittent lighting up?

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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.

Posted on Jul 23, 2009

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You can also check the switch behind the brake pedal.Sometimes the get loose.

Posted on Jul 23, 2009

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The bulb filament may have broken, but still making intermittent contact, or a loose wire around the bulb socket

Posted on Jul 23, 2009

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FROM LUSTY KID:

Check your bulbs first, I have lost both headlights on my ford at once on account of the bulbs burning out at the same time. Same thing probably happen, you have one filament out. The lights can work, but if the filament for brake is burnt, you don't see brake lights.

As for the cruise control. Check fuse box first. If OK check vacuum hose to actuator in engine compartment for starters.
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