Question about 2006 Isuzu Ascender

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Fuel Gauge reads empty, but tank IS full

The last 2 times I have filled up my 2006 Isuzu Ascender the gas gauge goes nuts! first it won't register that the tank is full (although I just pumped 18+ gallons of gas!). the low fuel light is on, and then the check engine light comes on. slowly the gauge tries to read, which usually takes a few days of the gas gauge just bouncing all over the place. Then the check engine light goes off. And, within a few days, its reading properly again.

The first time it happened I thought perhaps i just bought "bad gas." It happens. But, when I filed up the next time at a higher end gas station, the problem happened again!

Any suggestions...???

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  • Cathy Schaefer Feb 03, 2009

    Volvo2103...silly question, how do i put HEAT in my gas tank?? i already live in the desert (Vegas to be exact), so its not like its that cold/moist here.

  • cerule regia Feb 13, 2009

    I have the exact same problem with my 2007 Ascender. I was going to try replacing the fuel sending unit. I did this to my 1999 Rodeo, it was not that difficult. I am unsure if the fuel sender is related to the Check Engine light.

  • Anonymous May 02, 2009

    Well count me in as having the same problem. I have 53,000 plus miles and when I fill the tank up it still says I'm empty and the engine light comes on. If this is a problem with these cars shouldn' there be a recall of some type? I just paid this car off and hate to spend money on something that should not be a problem with that few miles.

    I love my car and want to keep it for a long time.

  • mary brun Sep 06, 2012

    I'm having the same problem with my 2007 Ascender, and i'm being told it's an expensive fix, I also just had to replace my controls in the windows because it melted in my door anyone else having that problem?

  • Danny Anderson Sep 19, 2012

    I also have been experiencing oddities with my 2006 Isuzu Ascender. The gas gauge will show correct readings then will drop to empty at about the half tank mark and stay there until I fill it back up again. Also the driver window rolled down by itself yesterday and caught fire, I was able to disconnect the power cables to keep electricity from going to this circuit board but now my window is down and I can't afford to have it fixed. When is GM going to fix these problems?

  • Anonymous Mar 31, 2014




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The float in your gas tank seems to have water in it....water is heavier than gas, that's why gas floats on top of water....try putting something like HEAT in it to dry up the water in your tank....

Posted on Feb 03, 2009

  • Gary Loney
    Gary Loney Feb 03, 2009

    It is impossible to tell what part of the country, or even the world, unless the asker states the area where they drive the vehicle in......HEAT is a product that comes in a can, and is a dry liquid, and is combustible. It absorbs the moisture in your gas tank. By not know where you live, I assumed you where in cold country...My mistake, I should have asked you that question.....As stated on my profile, "nobody is perfect" Glad you found humor in it at least.....


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Fuel sending Unit Is Faulty. This In A Float That is Useing this Foating Mechanics Turning it into An Electrical Signal that you See Incar as A Reading. its Somewhat Costly as The Fuel Tank Must Be Removed. _-_- Rarely The Wiring or Gage is the Problem But Worth Ruleing Out , An Honest Mech/Tech will Find Witch One it is So Sorry BUT Good Luck With that Unless You Know One Personaly. I Hope this Helps You Find the Problem As Its Only 1 of 3 Items

Posted on Feb 03, 2009


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I also have been experiencing oddities with my 2006 Isuzu Ascender. The gas gauge will show correct readings then will drop to empty at about the half tank mark and stay there until I fill it back up...

the tank sending unit works off a resistor to read the amount of fuel in the tank. you will need to replace the entire tank sending unit for fix this problem. As for the door problem....The short in the wiring for the door has to be found to repair

Sep 19, 2012 | 2006 Isuzu Ascender

1 Answer

Gas gauge was just under 1/4 tank, I filled up and the gauge did not register full. after driving for approx 30mins the gauge slowly moved to full.

There is a small float in your gas tank something like the one in your toilet tank(no I'm not kidding).Its position regulates an electrical current and based on its resistance gives a reading on your gas gauge. My best guess is this float got a bit stuck in the low position and it shock free after some time on the road.This is more common than you would think.Keep an eye on it and if it freezes in empty position or sometimes full position it will need to be replaced. Hope this helps,good luck.

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Fuel gauge not working all the time.

This is a normal concern.
The instrument cluster uses 4 different operating modes to calculate the fuel level:
Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The key must be in the OFF position throughout the entire refueling of the vehicle.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
The key ON fueling mode (approximately 90 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The transmission is in PARK (P).
The key is in the RUN position.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
Recovery mode is incorporated into the instrument cluster strategy to recover from a missing fuel level input during a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sender or its circuits. Recovery mode (empty [E] to full [F] approximately 20 minutes) is initiated when the following 2 conditions are met:
The instrument cluster is in the anti-slosh (default) mode.
The actual fuel level in the tank is greater than what is being displayed by the fuel gauge

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