20 Most Recent 2004 GMC Envoy Questions & Answers


Pump replacement is fairly involved, but the issue is rarely the pump, as it is pretty indestructable. If you have low pressure, usually some clearances are too loose, somewhere. There is also sending unit issues, so measure your pressure with an external "known good" gauge.

2004 GMC Envoy • Answered on May 05, 2021


Do you live in a dusty area? My sister lives in dusty New Mexico and had a malfunctioning XUV tailgate. My reasoning was that something must tell the tailgate not to drop down if the glass is up, and if it can't tell, then it will only open sideways.
So we removed the trim panel, and the tailgate was indeed full of dust. By reaching my arm in, I found two plastic optical sensors which tell the gate whether the glass is up or down; both were coated with dust. After cleaning these the tailgate was back to its normal operation. The two sensors are flat, round - about the size of a nickel or dime...I couldn't see them, just found them by guessing that they must be there. Hope this helps!

2004 GMC Envoy • Answered on Apr 23, 2021


My drivers side power seat stopped moving forward and back...back rest still worked. Took it to dealer and they charged me $60 to fix a "loose wire."
The seat worked for 2-3 days and quit again. Took it back to the dealer, and they now said it needed a new motor and track at a cost of $750+. Told them to forget it and called GM. GM will not cover it, and they have not covered a host of other problems like new radiator, new water pump, new instrument guage cluster, cracked exhaust manifold, and misaligned rear door/window air deflector (which they even have a bulletin out to all service department that it is poor design and the body shop should "shave the plastic down so it doesn't hit roof when door is open).

Back to the seat, I took a large, flat blade screwdriver and ran it along the seat guide rails and pryed on the seat mount slightly....guess what? It the power seat now moves forward and back.

Bottom line is GM manufactures junk and will not stand behind it. Now we know why the company is going bankrupt.

2004 GMC Envoy • Answered on Apr 07, 2021


Look on the SERVICE PARTS IDENTIFICATION Sticker in the glovebox for code UQA. This code = Bose Premium Sound System. The amplifier should be on the right behind the glovebox.

2004 GMC Envoy • Answered on Mar 02, 2021


If you hear a noise near the rear left tire and removing the fuse makes the noise stop, then check the SERVICE PARTS IDENTIFICATION Sticker in the glovebox for code "G67." G67 = Air Level Control suspension, a.k.a. Air Ride Suspension, or Smooth Ride (or Luxury Ride) Suspension. You hear the air compressor turning on/off that inflates the rear air bags; the vehicle does a check when it's started, and will add air when you add weight to the cargo area or add a full load of passengers.

2004 GMC Envoy • Answered on Mar 02, 2021


depends if your car has an automatic transmission if it does the brake light switch signals the transmission control module to Unlock the torque converter ,so the car does not lurch forward if brakes are applyed on fast if its a std transmission no not that im aware of

2004 GMC Envoy • Answered on Jan 01, 2021


Check the number 07 fuse under the rear passenger seat. It serves the Truck Body Controller 2 (TBC 2). The controller fails & is a known source of intermittent battery drain. The will not be blown, it is just serving a bad controller that is not turning things off as it should.

on Oct 01, 2020 • 2004 GMC Envoy

Tip

This is a common problem with an easy fix. If you are experiencing weird behavior from the instrument cluster it quite possibly is caused by corrosion on the circuit board on the back on the instrument cluster. To fix this you need to remove the instrument cluster. Refer to YouTube for this there are lots of videos shopping this, This step is much easier than it sounds, there are 4 screws and one plug. Inspect the circuit board you should see about a dozen places that have a dusty/crusty appearance (see the attached image). Clean the corrosion using isopropyl alcohol and a cotton swabs. Reinstall the cluster and your good to go.

on Oct 15, 2019 • 2004 GMC Envoy

Tip

Natalie, our 4.2 engine only likes 1 sparkplug. AC Delco 41-103. This Iridium plug comes pre-gapped, to near the specs Mike posted. Don't try and gap these particular plugs yourself, easy to ruin them.

2004 GMC Envoy • Answered on Sep 20, 2019


Try stepping on the brake when trying to shift with the key on. Then try starting im neutral or other gears to see if the neutral safety switch is bad in park. You may have a bad wire from the battery to power distrubution or bad ground. So many things it could be.

2004 GMC Envoy • Answered on Sep 14, 2019


There is a technical service bulletin regarding this problem with 2004 GMC envoy. Actually there are 3 separate issues with regards to the elecronic tailgate. The reason why the dealers are backordered is the part you want keeps failing after a time of being installed.

For the particular problem you have of the electronic latch not working, the bulletin recommends a inspection of the endgate connector C900. Look for the wires to be backed out of the connector or not properly crimped. To crimp you will need a crimping tool available at any electrical supply shop. The connectors can be had from the dealers.

The other solution referred to intermittent operation of the endgate but can apply in your situation also. For that, look for chaffing at the wire harness connectors for the endgate actuators located at the upper right and lower left latches. They have been found to be pinched up to 8 inches away from the actuators. In this situation it would be ideal to replace the connectors and install in a way so wires will not be pinched.

The other thing to look out for is dusty sensors. For this you will need to remove the tailgate trim panel and locate the 2 optical sensors on either side. You can feel them with your hand, they will be the size of a nickel. Clean all the dust under the trim. In addition to that you should open the switch and use contact cleaner to clean out any dust or debris inside there. There is no mechanical way to open the door once the electronic side has malfunctioned without damaging the door. I hope this helps.

2004 GMC Envoy • Answered on Aug 26, 2019


Below are some diagrams for you. If you have the XL model there it will be different for the rear passenger compartment fuse panel which I did not include. I did include if you had a 6 or 8 cylinder engine for the under the hood fuse panel because there is a difference. This should be in your owners manual if you have one. If you do not and would like a copy, you can email me at [email protected] with your make, model and year and I will be happy to email you a copy. I hope this helps and good luck.


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2004 GMC Envoy • Answered on Jun 10, 2019


yes pulley free wheels--- when clutch is engaged [turn on ]then compressor is turning as well

2004 GMC Envoy • Answered on May 08, 2019


I know this question is old, but I am responding so others with the same problem can see. I wired the Rear Window Motor Park Signal wire and the Rear Window Motor Speed Signal wire together and it completely bypassed the rear wiper motor. Now the window goes up and down. This doesn't fix the rear wiper motor, but you will be able to have access to it now that the window is out of the way I made and album to show. http://imgur.com/a/q3vww

2004 GMC Envoy • Answered on Mar 30, 2019


Temperature blend door actuator is probably stuck on heat position , needs replacing more then likely. Videos on youtube showing how to replace it . https://www.youtube.com/watch?v=4wPg6uJCNcs Now as far as it shutting down , that could be any number of thing's , could cost a lot of time an money tracking that down . It would be best if when it shut off it wouldn't restart ,easier to fix that way .

2004 GMC Envoy • Answered on Feb 23, 2019


I got this free Pdf manual from reliable-store for free and I don't think Ive visited a mechanic or fixya for help for more than 3-4 times out of the 20 times I fixed the chipper in these 4 years

2004 GMC Envoy • Answered on Feb 07, 2019

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