Fuel Gauge Sporadically Sticking?

here is some info:Some customers may report the fuel gauge fluctuates or operates erratic on their 2006-07 Buick Rendezvous equipped with the (LX9) engine. Engineering has determined that the PCM (Power Control Module) calibration needs to be updated.

Recommendation/Instructions:
Reprogram the PCM with the latest calibration available on TIS2WEB for the appropriate (Delphi or Siemens) EGR valve and retest.

Note: This new calibration will address fuel gauge fluctuation concerns for customers who typically park their vehicle on an incline.

post back with any other questions.

Electrical problem
2006 Buick Rendezvous Engine Size unknown All Wheel Drive Automatic 33000 miles
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I just bought an '06 Rendezvous a week ago. It has been in the shop twice already to fix that gas gauge- still not fixed. It bounces all over the place so I don't know how much gas I have. I finally called directly to GM this morning and was told this is a design flaw and it cannot be fixed. They told me that if I park on a flat surface and don't move, i will get an accurate reading. If I am moving, I will NOT get an accurate reading. First of all, that is HORRIBLE and totally unacceptable that is was designed to not work properly (and has been since 2002 without being re-designed). But, my issue is that I don't think everyone with a Rendezvous is having this problem which means it isn't a design flaw. It is just a problem with my vehicle (any many others) but I'm hoping it can be fixed. Let me know if you own a Rendezvous that has a gas gauge that works properly. I'd love to think that this can be fixed. Other than not knowing how much gas I have, I love this vehicle and don't want to have to return it. Thanks!

my rendevzous does the same thing all we do is watch the drivers info center and see how many leters of gas we have burned. just keep track when you fill vehicle and reset gauge to 0

I just got an 06 Rendezvous a month ago and am having the same problem. I replaced the sensor/sending unit which was extremely expensive and am still having the same problem. It can go from half a tank to empty in 10 mins. How can this problem be fixed???? this is crazy!

I have a 2004 and my guage never worked. I write down amount in gallons each time I fill up and use my gas used meter, reseting every time to 0.00

dealer, replaced gas tank, still having fluctuation in gas gauge.. then updates software at a price of $115.00. still, having original problem... now they tell me, gauge gets better after driving for hour or so... and it won't be accurate when you first start up , even if your on level ground. you have to drive it for awhile to be accurate.
question: have they been robbing me of money and time and now feeding me bull crap?

Chances are they are not sure what to replace. Why was the tank replaced? It has nothing to do with the fuel gage. Also, was the fuel pump replaced? The float for the fuel gauge is part of it. As far as a reading, it should be right when you first turn the key on. There should be no reason for you to drive for an hour to get an accurate fuel reading. Have they checked the body control module?

Let me know.

Fuel gauge erratic readings what could be wrong?

hi:
There is a float sensor in the tank that could be the cause, or there could be a ground or body control module problem.

What does the gauge do?

one min it's say's full then it drops to empty

Mine does the same thing what is causing this

9 times out of 10 its the fuel level send on the fuel pump module. To be sure you can remove the unit and reconnect it with the key on to work the float up and down then watch the gauge. Here is how you remove the unit. Check out the diagrams (Below). Please let us know what happens.

Dear sir,

When I start my car everytime, the Gas Gage goes from full to empty to full to empty (back and forth and the "check engine" light is on and it says gas low but I have plenty of gas in car. Sometimes also it revs to fast when you start it. or when you give it gas it acts like it goes nowhere like there is not gas going to car.

It sounds like the rheostat on the float is bad. It is the device that sends different levels of power to the gauge. If it is bad, it will cause this. However, it is part of the fuel pump and in the tank so it isn't easy to do.

Let me know if you have other questions.

Joe

after filling the gas tank to full, the gauge stays on the full mark even after driving 200 miles. Also on occasion the needle will drop right down to empty and will either bounce back to full after awhile or go back to full after shutting car off and restarting. Am I looking at a gas tank fuel sensor problem???

it may be the tank sender or dash but problay dash have a pro look at it.see if the sender is sending a signal or not

My gauge flucuates from empty to full when not completely full.

Suspect faulty fuel level sensor or bad wiring to sensor. fuel level sensor is located on fuel sender unit assembly, in fuel tank.

A few weeks ago my gauge started floating all over, it can be full one minute(when I know it is near empty) or low when fuller. Have ever came accross this problem and if so how do you fix it? Luckily I know how many miles per tank I get.

We just bought a 2006 Rendezvouz a week ago and have had it into the dealership twice to have the gas gauge fixed. Still not fixed and was told by several people that it is a design flaw and there is no fix for it. I called GM/Buick directly this morning and they confirmed that it is a design flaw and that when the vehicle is moving, you will not get an accurate reading. You need to have it sitting still on a flat surface and then you will know how much gas you have. What a bunch of b.s.!!! This buick is going straight back to the dealer and I'm buying a Honda (we have never bought an import before). How pathetic that this is the best we can expect from Buick/GM. This has been a 'design flaw' since at least 2002 and they haven't fixed it yet. There is absolutely no excuse for that. Wow- I'm couldn't be more mad than I am right now!!!

Subject: The Fuel Gauge Fluctuates - keywords cluster erratic intermittent IPC sensor #PIT4051C - (11/10/2006)



Models: 2006-2007 Buick Rendezvous 3.5L




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This PI was superseded to remove the service cal part numbers. Please disarcd PIT4051B.


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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Some customers may report the fuel gauge fluctuates or operates erratic on their 2006-07 Buick Rendezvous equipped with the (LX9) engine. Engineering has determined that the PCM (Power Control Module) calibration needs to be updated.

Recommendation/Instructions:
Reprogram the PCM with the latest calibration available on TIS2WEB for the appropriate (Delphi or Siemens) EGR valve and retest.

Note: This new calibration will address fuel gauge fluctuation concerns for customers who typically park their vehicle on an incline.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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[quote:b65098b530="puddytat2"]Electrical problem
2002 Buick Rendezvous 6 cyl All Wheel Drive Automatic 128000 miles
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A few weeks ago my gauge started floating all over, it can be full one minute(when I know it is near empty) or low when fuller. Have ever came accross this problem and if so how do you fix it? Luckily I know how many miles per tank I get.[/quote:b65098b530]

Same thing happened to me recently on my 2002 Buick Rendevouz (at only 82,000 miles). According to the Buick dealer, the fuel level unit was broke, and its replacement would cost me 500 bucks (which my extended warranty doesn't cover).

This also messes up the "Fuel Range" readout in the DIC, obviously. So now I just use my odometer and Fuel Spent readings.

This may not be your issue. If you find a better or cheaper fix, let me know.

Regarding gas gauge erratic problems,the rivetman says he has a 15 min fix,just send him an e-mail but left no e-mail address.How do we get in touch with him?? Thanks for your time.

More info Ref:post on Oct 23 by thrrivetman.
He states a 15 min fix and to e-mail him.

His name Brian Proskin r-55810

GM employee Canada

Hopefully he can respond and help us out.

My fuel gauge needle works sometimes and sometimes it doesn't. It just stays on full. Even when I've driven half the gas out, it still sits on full. But when I get close to empty it will go down to empty and the low fuel light will come on. Once I fill up it will go back to full. Sometimes when full it will fall over to empty and as I drive it will go back over to full. What is wrong? Is it something that will cost a lot to have fixed?

HI there,

I feel that this will be a faulty sender unit in the fuel tank, have this checked first.

Mark (mhpautos)

Engine Performance problem
2002 Buick Rendezvous All Wheel Drive 105,00 miles

My gas gauge is acting erratically. The needle flies from full to empty to half to 3/4 to empty to full and everywhere in any second. The miles remaining always coincides with the needle. I have no idea how much gas is in the car or whether it is empty so I keep track of mileage to go when I add gas. What could be wrong and can I repair it myself? Thanks, DiAnne

This vehicle is common for having faulty level sensors and internal instrument cluster problems. I would first have the vehicle scanned to see if any trouble codes are present. Most auto parts store will check for trouble codes as a courtesy.