Hi, I just bought an '06 Envoy XL with the same problem. Just fixed it. There is a fuse box under the rear seat on the driver's side. Look for a 20A yellow fuse towards the center line of the vehicle. Check your owners manual if you need more clarity. Change that and I think you'll find the problem solved.
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There are actually FIVE cigarette lighter/ Auxilliary Power Outlets shown in the wiring diagrams for your vehicle. The Instrument Panel  Accessory Power Outlet (Cigarette Lighter) is protected by the "LTR" Fuse (# 53 - 20 Amp) in the Power Distribution Center (PDC) in the engine compartment.
The Instrument Panel  Accessory Power Outlet is protected by the "AUX PWR" Fuse (20 Amp) In the Instrument Panel Fuse Block on the left side of the dash.
The Center Seat Accessory Power Outlet and the (two) Center Console Power Outlets are protected by the "AUX PWR 2" Fuse (20 Amp) In the Instrument Panel Fuse Block on the left side of the dash. NOTE: If your vehicle is not equipped with the Center Seat Accessory Power Outlet, or the Custom Floor Console (optional), this fuse position will most likely be empty.
Most likely you have something metallic that entered/fell inside one of the cigarette lighters.
I once found a dime inside a cigarette lighter which my children assured me was placed there by a shadowy personage named "Notme". Go figure.
While the fuse is REMOVED, look inside each lighter with a flashlight and remove the foreign material.
If you find nothing inside the lighters, disconnect them all from the electrical system by removing the single wire attached to the rear of the lighters. Replace the fuse.
Alternately, you can disconnect them one at a time, replacing the fuse after each one. You may need a few fuses for this.
If the fuse blows after ALL the lighters are disconnected, you have a wiring short circuit which is best diagnosed by a professional.
If the fuse does not blow, begin reconnecting the lighters until you see a spark, or the fuse blows again. This is the faulty lighter, replace it and your problem is solved.
Note: You cannot get shocked or electrocuted by your car's 12 Volt system but you can be burned by heavy sparking. You can reduce the risk of heavy sparking by using a lower-rated fuse during the testing. Wear saftey goggles and latex gloves for safety.
Check ALL the fuses. pull them out an dlook. Also repace the one that is power for the dash/rradio/etc... even if it looks good.
If that doe snot fix it then pull the lighter out and test the wire going to it for power. If it has power then you might have a bad plug/ground. Replace outlet if so.