Question about 2006 GMC Envoy Xl

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2006 Envoy fuel sensor failure

After starting, the fuel gauge goes to full then drops down to empty within a mile or two of driving. Had the same problem at 42,000 miles and had fuel level sensor replaced under warranty. Vehicle now has 91,000 miles and the same problem. Dealer wants $350 to $400 to replace sensor again. How difficult is it to replace this sensor? Part price?

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The sending unit for the gas gauge is in the fuel tank and part of the fule pump module, it is not sold seperately. price around $350.00, 2 hours labor to install the part. see photo
2006 Envoy fuel sensor failure - c8ad23d.jpg

Posted on Apr 15, 2009

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Posted on Jan 02, 2017

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Usually I find there are two common causes for this problem. If the gauge goes to empty after a fill up but then starts to work and be fairly accurate as the fuel level in the tank drops then it's often the fuel level sending unit which is attached to the fuel pump module inside the tank. I have seen some guages go bad also [actually the servo motor that runs the gauge] but usually the gauge will stick in one spot and rarely move or go to either end of the scale and stick there. A good shop should be able to determine the cause of your problem pretty quickly. Hope this helps and good luck!

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You will need to replace the fuel level sensor which is in the fuel tank.They have a lot of problems because the metal fingers on the sensor wear off and gives you the incorrect readings.This will also cause the check engine light to come on.You will probably have a level sensor code.This will be a lot easier if the fuel level is down to about a quarter tank or less.Also you should be able to get just the level sensor and not have to get the complete fuel pump module.Good luck.

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The oxygen sensor has nothing to do with the fuel gauge. There are two possibilities for the gas gauge error, first it could be the in-tank gas level sensor or it could be a defective stepper motor which drives the gauge. A professional scan tool can determine the fuel level being sent by the in-tank sensor, if that disagrees with the gauge, then the stepper motor needs replacing.

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1 Answer

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izzy, The fuel gauge is a serial data controlled component. The PCM sends a message to the gauge to tell it what the sending unit says the fuel level is.
Because you do not have any EVAP codes or others, I would speculate the gauge is defective.
Take your vehicle to a repair shop and have them do a data scan and look at the fuel level data to see if the sending unit is sending the correct level to the PCM. If it is, they can check to see if the fuel gauge is getting the correct message but not showing it correct fuel level. This would indicate the gauge is defective.
Good luck and let me know.
Regards,

Feb 26, 2009 | 2006 GMC Envoy

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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.

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most likely a fuel sending unit problem in the tank. could also be problem in dash but sending unit is first suspect

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