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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15181
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Ok nxt question on this free trail. my fuel gage is not

Customer Question

ok nxt question on this free trail . my fuel gage is not reading right. when tank is full it reads empty, and fuel warning light comes on
Submitted: 8 months ago.
Category: Chevy
Expert:  chevygeorge replied 8 months ago.

Hello, My name is ***** ***** I'm here to assist you today. Please give me a moment while I pull up the documents.

Expert:  chevygeorge replied 8 months ago.

The GM document requires a signal generator to test the gauge operation by varying resistance to the instrument cluster. I suspect your issue is going the be the sending unit, but let me pull a schematic. He's the resistance reading the sending unit should have at different tank levels.

https://www.dropbox.com/s/wpneki12r9r82dd/FuelLevelspecs.pdf?dl=0

Expert:  chevygeorge replied 8 months ago.

3.4l or 3.8l in your monte carlo?

Expert:  chevygeorge replied 8 months ago.

Here's the diagnostic we're working with.

https://www.dropbox.com/s/z8qgoc3k2j1sjc1/FuelGauge.pdf?dl=0

The IPC displays the fuel level as determined by the PCM. The IPC receives a class 2 message from the PCM indicating the fuel level percent. The fuel gauge defaults to E (empty) if the PCM detects a malfunction in the fuel level sensor circuit.

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