Question about 2006 GMC Envoy
The sulfur content in the fuel is contaminating the contacts of the sending unit.
Some people have had good luck with some fuel system cleaners solving this problem. The cheap stuff doesn't seem to do the job.
Not that GM isn't completely exonerated from fault but the gas stations don't do a very good job of watching what the stations sell.
Posted on Jun 20, 2009
Same exact problem with my GMC. I filed a complaint with GMC directly and sent them an email of this problem. Please everyone do the same.
Posted on Dec 12, 2009
I just called GMC they told me there is a bulletin #10054D which covers 10 years old or 120,000 miles . They said it will be no cost to me . I am waiting to hear from dealer and will post after...
Posted on Oct 22, 2012
Same problem here with 2006 Envoy. NHTSA has opened an investigation early this year. Be sure to file a complaint with them:
Investigation # DP10001: THE PETITIONER ALLEGES THAT THE FUEL TANK LEVEL SENSOR IS DEFECTIVE AND COULD RESULT IN A SUBJECT VEHICLE RUNNING OUT OF FUEL, STALL, AND BEING REAR ENDED BY ANOTHER VEHICLE. ODI WILL EVALUATE THE PETITION FOR A GRANT OR DENY DECISION.
Posted on Oct 03, 2010
I filled up my Envoy (it was at 1/4), when I started the vehicle the yellow low gas light came on and the bell. I shut off the vehicle and restarted it and it was fine - that was 3-4 fill ups ago. It has continued to get worse. It now fluctuates up and down, but if tank was recently filled, will remain on E for a while.
I have also contacted GMC about this problem.
Posted on Jan 05, 2010
I had the same problem...It cost me $800 to fix it because gas line was clogged and the sensors stop working...get ti fixed ASAP...I waited and got stuck in Newbrugh cuz the truck would not start even with a full tank of gas.
Posted on Nov 12, 2009
Like the others, i had the same problem with my fuel gauge. I had a garage replace the fuel tank sending unit, that fixed the pproblem. Shortly afterward, GM sent me a recall for the fix, letter also stated that if I had the repair already done, they would refund me the money. I took a copy of all my bills related to this fix and the dealer gave me a check for the full amount. so try your gm dealer first on this matter. replacing the sending unit is not an easy or a very safe job. The sender is in the gas tank.
Posted on Mar 09, 2015
If you cannot wait for a recall, please see david 197_99's answer.
"Sending unit. Its all one unit including fuel pump, float, ect. The check engine light is because of the high or low resistance in the unit. Let me know if you have already fixed.. You have to drop the tank to get to it also."
the fuel pump, filter and fuel sensor are inside the tank, on the top. to change it, you have to disconnect the tank and lower it to the ground (you should empty the tank before dropping, as such).
Posted on Dec 28, 2014
SOURCE: gas gauge problems
Common problem on the 03-06 Envoy instrument clusters for the fuel gauge to go out. It's usually caused by one of two main problems, either the stepper motor on the cluster's circuit board is going out or the sending unit on the fuel pump is going out. Check out this blog post about the problem - Envoy fuel gauge problems
Posted on Sep 30, 2010
Sending unit. Its all one unit including fuel pump, float, ect. The check engine light is because of the high or low resistance in the unit. Let me know if you have already fixed.. You have to drop the tank to get to it also.
Posted on Aug 04, 2009
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