Question about 2006 GMC Sierra 2500HD 2WD

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When my truck is full of disel the gage works but when it starts to go down a little it starts to go crasy and then falls to emty even if it under full

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Sounds like tank sender unit resistor damaged or broken

Posted on May 12, 2010


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Do i have to drop the gas tank to change the gas pump on a 2011 gmc acadia? Also if the fuel level sensor is bad will the car shut down if the gage says it is emty but it is not?

Yes the fuel tank has to come out to change the fuel pump. But are you sure that is the problem ? Your vehicle has a Fuel Pump Flow Control Module (electronic's ) Or is it just your fuel level sensor you want to replace ? And to your question of if the fuel level sensor is bad will the car shut down if the gage says it is emty but it is not? No ,this will not shut down the vehicle. You probably have no idea of the complexity of the electronic's involved an the thing's that can cause the gauge not to work .
Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the ECM. The IPC receives a serial data message from the ECM indicating the fuel level percent. The fuel gage defaults to empty if:
• The ECM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of serial data communications with the BCM
• The BCM detects a loss of serial data communications with the ECM
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates in the IPC.
Unless you have a factory or professional type scan tool your better off taking your vehicle to a qualified repair shop.

Fuel Gage Inaccurate or Inoperative
Circuit/System Description
The fuel level sender changes resistance based on the fuel level. The engine control module (ECM) monitors the signal circuit of the fuel level sender to determine fuel level. When the fuel tank is full, the sender resistance is low and the ECM senses a low signal voltage. When the fuel tank is empty, the sender resistance is high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the fuel level sender in order to calculate the remaining fuel level percent in the tank. The ECM sends the fuel level message via the serial data circuit to the body control module (BCM). The BCM sends the fuel level percent to the instrument panel cluster (IPC) via the serial data circuit for display on the fuel gage.

Short to Ground
High Resistance
Short to Voltage
Signal Performance
Fuel Level Sensor Signal
P0463, P0464
Fuel Level Sensor Low Reference
P0463, P0464
1. Fuel Gage Inaccurate or Inoperative

Do you know what a DTC is ? diagnostic trouble code !

Apr 14, 2018 | 2011 GMC Acadia

1 Answer

My f350 just shut off while driving then wouldnt start i used butain to start it the it ran aslong as i had my foot on the gas pedel

Check fuses first, then I would check the wiring harness for any issues.I would say fuel issue definitely. Sometimes the pump and gauge are one unit, sometimes separate, but they share the same wiring harness.

Apr 13, 2013 | 2002 Ford F250 Super Duty SuperCab

1 Answer


what kind of car do you have? take fuel tank down and replace float sensor (mecanism)

Aug 30, 2012 | 1996 Nissan Sentra

2 Answers

Gas gage read full when empty and sometimes emty

You have a bad fuel level sensor.The fuel tank needs to come out and the sensor replaced.You don`t have to replace the pump assembly.You can get the level sensor separate.I`m not sure if the parts stores have it but I know the dealerships do.Hope this helps.Good luck.

Mar 16, 2010 | 2004 Pontiac Montana

1 Answer

I have a 2002 grand prix gt my gas gage goes from full to emty sometimes it goes 3/4 sometimes 1/4 do u no what the problem is

sounds like you need new fuel pump. fuel pump located in gas tank. before you go buy a new fuel pump first push up and down on trunk of car real hard to try to dislodge the little armature inside of tank. this little armature is what sends the signal to the gauge telling you the quantity. push up and down on truck to try to dislodge small signal armature then check your quantity. try this when you are having the problem and i am willing to bet the little armature is stuck. the only way to fix is to buy a new pump.

Dec 29, 2009 | 2002 Pontiac Grand Prix

1 Answer

How fix fuel gage on 2003 saturn l200

either the fuel sender in the gas tank is bad or the bcm is bad,most likely sender

Sep 22, 2009 | 2003 Saturn L-Series

2 Answers

Gas gauge not woking properly gas tank only accepts a little gas

a fuel sending unit seems to be the most popular solution. the part is about $40. I think the labor is what's going to kill you.

Nov 21, 2008 | 2006 GMC Envoy

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