Question about GMC Envoy

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2004 GMC ENVOY SES light came on....

SES light came on at the same time the headlights dimmed for 5-10seconds then went back to normal. Drove15 miles with the light on steady to autozone they did their scan on the computer and it had 22 codes as a result... the codes were U1100*U1255*U1016 C0300*C0305*cO306*C0321*C0327*C0359*C0374 C0379*C0550 B0770*B0775*B0780*B0785*B0790*B2725 U1301 P0410 in that exact order....the guy at autozone said he couldn't give us an answer because the codes were specific to GM and they didn't know them....what now???

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You can ask one of the search engines about the codes.

Posted on May 16, 2017

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Have your battery checked, along with your alternator. A week battery will cause a ton of codes.

Posted on May 16, 2017

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So many codes suggest a problem ECM or BCM
check for all ground points , battery connections and harness connections to the computer units

Posted on May 16, 2017

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2strokeJim
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SOURCE: ecv malfunction

Is your Ignition switch working O.K. ? My Daughters 03 Had a bunch of codes,trans codes and service eng soon light etc. Come to find out Her ignition switch was Bad, it wasn't powering up all circuits, replaced it and worked to this day, 3 years ago

Posted on Mar 01, 2012

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1 Answer

My low beam headlights won't turn on in 2004 gmc envoy


It's the headlamp relay #46. If you want to test it, swap it out with the cooling fan relay #45 and see if your headlights work. If they do you know this is the fix. Found the solution online a couple of years ago and it was spot-on. The part was $45 at autozone at the time.

Aug 12, 2012 | 2004 GMC Envoy

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Need to turn on headlights of 2004 gmc envoy slt while still in park


See the figure below. Use the headlight selector to turn on the low beams, even when in Park.


1_22_2012_2_14_39_am.jpg

Jan 13, 2012 | 2004 GMC Envoy

1 Answer

2004 envoy xuv low beams went out all other lights work checked fuses and switched relays 45 and 46 and still not working any ideas?


Try to see if the bulbs blew out by replacing the bulbs first. If they still won't light, it could be bad grounds or connections or bad continuity in the wiring to the headlight relays or switch. Good luck on this repair.

Dec 11, 2011 | 2004 GMC Envoy

1 Answer

2004 GMC Envoy driver's side heated seat quit


I have the same problem except the back of mine works but the bottom doesn't. Passenger side is fine. Let me know what you find out if you could.

Aug 26, 2011 | 2004 GMC Envoy

1 Answer

My front bumper headlight on my 2004 GMC Envoy fell out. How do I re-install it?


under the hood of my gmc sierra where the light sits there are slide pins. maybe you lost one. try looking at the other headlight to see whats wrong with the one that fell out

Feb 25, 2010 | 2004 GMC Envoy

1 Answer

SES light then Reduced engine power light, loss of engine power


Hi It me Mohammad Siddiq my dear. First of all it will be wise of use to take your vehicle to a dealership or any other fully equipped w/shop. They can better tell you what the fault your vehicle has. But at the same time if your friend has the same model vehicle so you can exchange some parts with that vegicle, e.g., Mass Air Flow or TPS (Throttle Position Sensor) and can check your vehicle. These parts do not need to be programmed with scan tool. Just Simply replace these parts and switch on the ignition and wait for 01 minute, then switch off for 30 seconds and then start the engine. Now road test your vehicle, if no SES light or reduced power then there was fault with the part/s replaced. So Return those parts and now you must replace these parts with new or used ones. Anything else I may be contacted on my yahoo id siddiq_pathan@yahoo.com. Thanks. I am an auto technician and working in a GM dealership in Saudi Arabia. I am from Pakistan.

Apr 28, 2009 | 2004 GMC Envoy

1 Answer

Changing a headlight on a 2004 GMC Envoy


If it's the same as a Trailblazer you have to first remove the "bowtie" from the front between the two light bezels. Gentle pull forward and the pressure clips will release. Don't be shy. There are no screws. Than with the light bezels exposed you will see a metal clip that has to be pulled back to release the bezel and it will swing forward to allow you access to the bulb.

Dec 13, 2008 | 2004 Chevrolet TrailBlazer

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