2002 yukon xl no power check engine light

2003 GMC Yukon XL check engine light run - YouTube

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Mar 31, 2014 - Uploaded by Antonio Salinas
2003 GMC Yukon XL with a check engine light on. ... HOW TORESET CHECK ENGINE LIGHT, FREE EASY ...

To scan ECM make sure cigarette lighter fuse is good. This fuse also powers scan tool.

You need spark at the right time, fuel pressure at the injectors, and normal compression.
Have the spark plugs been changed in the past couple of years ?
Have you checked the fuel pressure to see if it is enough ?
Have you sprayed carb cleaner into the throttle body to try to make the engine try to start ?
Does it sound like it has normal compression when cranking ?

low fuel pressure/or blown head gasket.

Check the fuel cap!! If the vacuum relief is not working it can impede the fuel flow and cause the engine to shut down or not restart after a stop. Waiting usually gives things a chance to stabalize and the engine will restsrt. When this happens again try loosening the cap and see if the engine will restart.....If it restarts immediately, REPLACE the fuel cap..Do Not leave it loose because this will cause other problems. If it is not the fuel cap the problem may be the filter, the fuel pump, or aome other fuel system malfunction.

coolant doesnt evaporate out of the engine. it has to be going somewhere find a shop that can add some uv dye into your radiator and check for leaks

Ah, believe this one is done by:

With engine off, turn ignition key on. press accelerator pedal down 5 times quickly, all the way to the floor. Light should blink then go off.

Have the fuel pressure switch checked.

you have to take it to a auto part store and they can tell you if there are any problems using a key code and then reset it

Check the headlight fuses in the engine fuse box compartment. Not sure if the lights have relays, but they will be clearly mark in the inside of the top cover for location.