25th Jan 2009, 12:42

I changed the heat blower module because I had no air. After changing the blower module, everything worked fine for one day. The day after I parked the Envoy and the blower fan kept on working, I checked the fuse box and no problems there; has anyone had the same problem, and please if you can, how did you solve it?

Thank you, Angel

I have a 2003 Envoy 4x4 loaded with the 4.2 motor.

31st Mar 2009, 22:59

I just purchased a 2003 Envoy yesterday with 75,000 miles. I get in it today to make some settings in the Driver information center. Well, it won't come up. No menus, no mileage indicators or anything on the Driver information center. After pushing and pushing the buttons to try to get it to turn on, I notice that the preset for the driver seat would not work and I think the radio presets changed. Not real sure about the radio, because I haven't had time to really set many of them.

Is this the start of the many electrical issues that I have been reading about???

I checked the fuses, but they are fine.

Any suggestions?

7th Apr 2009, 23:18

My 2003 GMC Envoy has had a lot of problems of late, and I was basically wondering if this is a common problem or if they are connected?

First the clutch fan went out in December. Replaced it.

Then in February, my alternator had to be replaced.

Then this month it needed a new battery.

I understand things wear out, but this has been a great car until recently. Today when I got home the car almost died and started sputtering when I put it into park. I turned the AC off to hear the engine and it worked fine. Turned the AC back on and it pulled the rpm's down so far it almost died on the spot. The AC has to be turned on when the car is going or it will choke out. I have no clue what to think about this last problem. Any help or information would be highly appreciated.

2nd Oct 2009, 11:17

I have a 2003 Envoy XL. Bought it new. It now has 145000 miles on it.

It has been a very reliable SUV other than gas mileage (16 to 18 mpg).

A problem just started this week. On start up the oil pressure gauge goes to 80psi at idle. Then it starts to drop. On average it always stayed at 40 (Midpoint). The needle begins to fluctuate between 0 and 40. As it goes to 0, the read out says low oil pressure, stop engine. When it increases, the readout goes back to whatever you had it on. Check gauges light goes on and off while this is happening. If you throttle up, it will go to 0 immediately and you get the readout. There is plenty of oil in the engine. OnStar says they read the same thing as the read out and to not drive the vehicle. Is the problem an oil sending unit, or is my oil pump or pick up screen giving problems? There is no knocks or pecking in the engine, and it actually sounds fine. Anyone with this kind of problem in the 5.3 engine?


12th Dec 2009, 21:34

Got my 2003 Envoy 4x4 as a company car with 175K miles on it. The Service 4WD light has been on and it will not go into 4x4 mode. The outside temp always reads 50 degrees. Other than this it starts, runs and drives very well. I have 193K on it at this point and I will keep the oil changed and drive this very comfy very roomy SUV until the wheels fall off. It still looks very good on the inside and out. Very impressed, but I have had no headaches.

13th Dec 2009, 19:02

I purchased a 2004 Envoy XUV in May 2008 with 61,000 miles. I do have a faint tickling noise in the gauges when sitting idle, but the gauges are working properly, so I don't feel this is a problem.

I currently have 81,000 miles and recently had the Service Engine Soon light come on. I have always felt that my gas cap never really tightened properly, so I replaced it.

I love this SUV, but since I have another car, I only drive it on weekends.

My brother is a mechanic in another state, and told me to remove the positive battery cable for about 10 minutes and it should reset the computer and Service Engine Soon light. I followed his instructions and the light is out. I have driven the Envoy a couple hundred miles this weekend and so far, so good.

However, it was very interesting reading all the comments, both good and bad from the various Envoy owners.

15th Dec 2009, 09:54

To 19:02.

We've owned a 2003 Envoy since June of '03. We bought it new. It currently has over 80,000 miles on it and has had absolutely nothing but one battery, one set of tires and one light bulb. Not even brake pads yet. My brother-in-law has owned two Trailblazers (exact same vehicle as the Envoy). He drives a lot and put over 160,000 miles on the 2002 before giving it to his son. It has never had any problems. His new 2006 now has well over 70,000 miles and has never had a single repair. These seem to be very good vehicles. I am sorry GM stopped making them.

As for the "check engine" light, a number of VERY minor factors can trigger these things. A loose gas cap can cause it to come on, and so can a need for an oil change or a dirty air filter. I've found that ours is very sensitive to fuel quality. It has come on twice, and both times a tank of premium gas and a can of good fuel injector cleaner has solved the problem. As a mechanic I highly recommend running a tank of premium through the car every couple of months as well as a can of injector cleaner. This will keep the fuel system clean and prevent expensive manual cleaning of the injectors. I have also noticed that all three of our cars get up to 2 miles per gallon better fuel mileage running premium. The engine runs cleaner and has more power, though the premium fuel IS more expensive.

16th Dec 2009, 16:12

I have a 2003 Envoy SLE (4.2 Engine) with 142k miles and have had most of the problems others have posted on this site and I am ready to get rid of it. My sister-in-law has the same car with 150K miles and already has replaced the transmission.

I currently am having problems with accelerating on the highway. While on the highway and after traveling up a hill or trying to accelerate quickly (i.e increasing the RPMs), the engine loses power and won't accelerate. The engine chugs or jerks when the accelerator is pushed but only at higher speeds. I had it checked by a friend and his computer told him the error was P0128 (running too rich). He told me I may have carbon build up in the engine.

Has anyone encountered this problem in the past, and if so what was the solution to fixing it?