There are 2 retaining tabs on the back side of the headlmap assembly. 1 on each side of the assembly. You must pull up an the tabs, then the whole assembly will come out. then twist the bulb socket out. See pic below for location of the 2 tabs.(labeled as #1) This view is from the backside of the assembly..... View Full Image
There is A White Star Type Screw on top of the headlight
The 2003 GMC Envoy brake light lamp is a 3157. See sources and related links below for more information on bulbs.
GMC Envoy was created in 2002.
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Where is the computer located on a GMC Envoy?
GMC stopped production in 09. wikipedia.org search: GMC Envoy
The GMC Envoy was produced in 1998 and not again until 2002. The Envoy was produce until 2009. GMC is no longer producing a vehicle with the name Envoy.
You replace the bulb the same as a 1998, which is answered further down the page.
there are two tabs on the top of the headlight that you need to pull up i the air they you can remove the hole headlight and the bulb twist out of the headlight
2004 gmc envoy with code p0128
Where is the starter localed on a 02 gmc envoy?
See sources and related links below for headlight lamp part number information.