Question about 2006 Chevrolet Trailblazer Ext

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Fuel guage on my 2006 chevy trailblazer stopped working and now it doesn't work right it fluxuates even when the tank is all the way full

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  • Donald R Leeser Jun 14, 2009

    This is an suv so I was wondering is there a access panel under the third row of seat



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Possible fuel gauge malfunction but its a chevy.

over the past year chevrolet fuel pump failure has increased by over 900% the fuel level sending unit is incorperated in the fuel pump module,

these fuel pumps do not like fuel additives nor do they tolerate E85 fuels.

you will need to replace your fuel pump assembly, try to locate a carter brand pump they are very reliable.

as far as replacement.
just open the fuel filler door remove the two torx screws and one push pin from the fuel filler neck, go under the truck at the back of the bed on the frame cross bar and unplug the bed plug, remove the 8 bolts that attatche the bed to the frame and the one ground wire under the bed by the fuel filler neck. get a budy and lift the bed off of the frame, now you can access the top of the fuel tank for the pump replacement. dont get discouraged it is a easy fix, i can do these in under an hour.

Posted on Jun 14, 2009

  • WESLEY SCHACHT Jun 14, 2009

    your right im sorry it is a suv.

    no there is no access panel. you will have to remove the tank,

    try to remove as much fuel as possible first.

    the fuel lines can be disconnected at the front of the tank with no hand tools, they are hidden behind the charcoal canister and there is only one bolt holding the canister on.

    the fuel filler neck is at the back of the tank just loosen the clamp and slide it off the tank neck,

    remove the two straps holding the tank, lower the tank about a foot reach ontop and unplug the pump,

    now the tank is completely diconnected and ready for removal from the vehicle.

    take a hammer and brass punch unlock the ring off the top of the pump,

    swap pump assembly with new one and reverse the procedure


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Hello, this problem is due to a failing stepper motor. The stepper motor is the motor behind the gauge that controls the movement of the needle. When a stepper motor begins to go out it will cause the gauge needle to stick, skip around, stay at zero or max out on the gauge. The only way to fix the problem is to replace the stepper motor with a new one. While replacing one motor it is best to go ahead and replace them all as the others will go out in time as well. Your cluster will have one motor for each gauge. Here's a link to a page showing exactly how to replace a GM stepper motor and where to get the correct parts to do the job! DIY Finally How To Repair GM Instrument Cluster At Home Speedometer And...

Posted on Dec 16, 2014

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I got a letter from Chevy stating that the fuel gauges have a tendenancy to stop working on the Trailblazer and that even though the car may be out of warranty, Chevy will agree to pay 50% if I take it to the dealer. I haven't done it yet and have no idea how much it will cost but I would call them and see if you can get the form from them to get half of your money back

Posted on Jan 15, 2012

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The gas gauge in my 2005 Chevy Trailblazer does not work. The guy at the dealership said that it sound like the fuel sensor went out but the entire fuel pump would need to be replaced.

On these the gas guage is part of the pump and the whole pump needs changed to get the new sensor for the guage. fule pumps tend to last between 7 and 10 years depending on use and how full you keep your tank., The fuller the better because the gas actually keeps the pump cool. You should not let it get below a 1/4 tank to preserve the fuel pump.

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This morning I had 1/2 tank of gas. I stopped to

the fuel level gauge just went out na dthats why the light is on. to replace it you have to replace the entire sending unit. cost is $500.00 plus to have replaced. if you can live with it and keep check on your milage, I would wait for the pump to go out.

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I had this problem as well. Took it to the garage and it was a $700 bill the part alone was $440 they had to drop the gas tank - and since then it's not been working right. The fan clutch went a week later another $700 bill. Picked it up and it was still making the same sound - garage replaced another sensor without charging me--picked it up and three days later the service engine light came on. Back to garage and another $80 part was needed under the hood. All this with just 52,500 miles and I keep it well maintained. Not a happy camper at all! Holding my breath but it's been only two days so far so good.

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Most likely the sending unit has gone bad.Removal of the tank is how to change the sending unit in the tank,It may only be available with the fuel pump assembely.To check it,disconnect the fuel pump at the fuel tank.With the key on,the gauge should peg out past full.

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Could be a
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2. Broken wire from fuel gauge
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Vehicle is not that old, would think it is still under warranty?

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khooper, in another forum, told me that "Chevron Techron Fuel System Treatment Plus can remove harmful sulfur deposits from the sending unit and a filmer agent that can prevent the deposition of said sulfur"

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So I went to a dealer, they replaced the fuel level sensor (p/n 19177712 SEN KIT 3.107 $118.62) with labor $270.00 for a total of $398.86 this appears to have fixed it for now.

I also talked to another mechanic who blames ethanol for these deposits !

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Ajkill is right. I had the same problem with the fuel light always being on and the guage read empty no matter how much fuel is in the tank. I had to have the fuel level sensor in the tank replaced. This is something that they have to drop the tank for. It was about $400 with the part and labor at the dealership.

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