Question about 2001 Chevrolet Silverado 1500

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Low fuel light comes on in message center and fuel gauge shows empty when tank has plenty of gas

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Sounds to me like the sensors bad!!

Posted on Sep 24, 2009

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Posted on Jan 02, 2017

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2006 Chevy Colorado Truck. Gas tank filled and fuel gauge indicator dropped to 1/4 full, when truck is idling fuel gauge drops to empty and low fuel light comes on. Suggestions? Thank you.
Check and or test fuel gauge sending unit and the gauge . Videos on youtube showing how to . Also i would have the vehicle checked for DTC's - diagnostic trouble codes . You may want to think about taking to a qualified repair shop .

Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the BCM 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.

DTC P0461
The fuel level sender changes resistance based on fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sender resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percent in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics.

DTC P0462 Fuel Level Sensor Circuit Low Voltage
DTC P0463 Fuel Level Sensor Circuit High Voltage

Jan 01, 2017 | 2006 Chevrolet Colorado

1 Answer

Digital gas gauge reading incorrectly and inverted
sounds like a faulty sender unit or your just realy low on fuel before you spend any money on repairs try filling the tank up with fuel as if its been low for a long time the sender unit in the tank may be sticking the fuel will lube it and may start working again

Feb 22, 2014 | 2008 Honda Civic 1.8

1 Answer

2003 Chevy S10 had fuel pump replaced. When fuel gauge shows slightly below half, the gauge falls to empty and low fuel lights blinks. What could be causing this?
hi,

sounds like the sending unit rheostat(sending unit) has a bad contact or break in the resistance wire. inside the tank theres a float attached to an arm that goes to a small rheostat, like a volume control on a stereo. the rheostat is sending a scratchy signal or no signal to the computer and your getting these readings. that part is inside the gas tank, the part usually comes integrated with the fuel pump. the gas tank has to be lowered to fix it.

jm

Jul 04, 2017 | 2003 Chevrolet S-10

1 Answer

When i put fuel in my tank no matter how much it is the gas guage shows that it is full but when the gas gets low enough for the fuel light to come on the light does come on and the gauge moves to empty....
Bad fuel sending unit.

Apr 10, 2011 | Buick Regal Cars & Trucks

2 Answers

Gas gauge not working correctly. All over the place. Usually after a fill up It stays on empty with the low fuel light for a few days. Then It'll vary from half a tank to quarter when there is easily...
Please refer to this http://www.fixya.com/cars/t1004109-2006_gmc_envoy_xl_gas_gauge_reads_empty which is what you might be having the promblem with.

Jan 14, 2011 | 2005 GMC Envoy

1 Answer

Gas gauge was reading full after fill up,then after a few miles read empty, and message center reads low fuel yet tank is full
this issue sounds like a sending unit issue, in the tank. test that.

Sep 07, 2010 | 2002 Chevrolet Corvette

1 Answer

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.

Jun 17, 2010 | 2006 Chevrolet Trailblazer

2 Answers

Gas gauge goes to empty and then full after fillup
very well sounds like the sending unit in the tank. Try running some octane booster and fuel injection cleaner in tank of the truck to loosen any deposits on the float.

May 27, 2010 | 2007 Nissan Pathfinder Off Road

3 Answers

Inquiry of 85 300zx analog fuel gauge operation
One is Fuel Level, and the other is Fuel Pressure

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

Sep 14, 2009 | 1985 Nissan 300ZX

1 Answer

1989 Saab 900 low level fuel light
You don;t say whether the fuel gauge is reading accurately, or whether it's always on empty. If the gauge is always showing empty, it's most likely a problem with the sending unit in the fuel tank. Check the resistance across the two terminals of the sending unit.

On a C900, the fuel sender level unit is separate from the fuel pump and located on the right side top of the tank, accessible by removing the trunk floor lift up panel (the pump is located on the left side top of the tank.
Possible problems are: electrical line off or broken, float not working (it's fairly delicate); or gauge not working.

Test the resistance of the sending unit with the lines disconnected, the resistance should be 2.6 to 3.8 ohms full tank, 63.3 to 67.5 ohms empty tank; and test for voltage across the top of the sender unit, if no voltage, that's likely the problem!

If the gauge is otherwise reading accurately (showing 'full' for a full tank, etc) then the problem is likely a gauge malfunction and can be simply replaced.

Good luck!

Saabreur

Jul 10, 2008 | 1989 Saab 900 4 Door

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