Did the shop duplicate the no start? Does the engine crank over but not fire or does it not crank over (do you hear the starter engage). Your post lacks important details about things like what the OBD2 fault code testing showed, does it have fuel pressure during the no start (if engine does crank over) does it have spark when it cranks but will not start?
SOURCE: shuts off while driving. no fuel pressure. pcm fuse blows/ fuel pump relay inserted.
Sounds like the fuel pump is shorted.
SOURCE: Is there another fuse box on the 2003 GMC Envoy
There is one under the passenger seat driver side. Flip up the seat and lift off the cover.
SOURCE: back speakers are not on my 2005' Envoy
not sure which radio you have but there is an amplifier under the back seat and there are some fuses there you may want to check your owners manual for fuse information
SOURCE: i have a dead radio in my 2004 envoy. no
there may be a small inline fuse at the back of the radio itself.....you will see it when you remove the radio, this is to prevent overload
SOURCE: can some post the 1999 gmc sierra wiring diagram
you don't have enough pressure in your system. odds are you have a leak someplace and the factory installed a saftey switch to keep the ac from running when there is no pressure. This way you don't end up burning up your compressor.
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