Question about 2006 GMC Envoy

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Gas gauge problem

I have a 2002 envoy my gas gauge goes to full for about 30 sec then drops to empty, I have no codes when I plug the reader in

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Izzy, The fuel gauge is a serial data controlled component. The PCM sends a message to the gauge to tell it what the sending unit says the fuel level is.
Because you do not have any EVAP codes or others, I would speculate the gauge is defective.
Take your vehicle to a repair shop and have them do a data scan and look at the fuel level data to see if the sending unit is sending the correct level to the PCM. If it is, they can check to see if the fuel gauge is getting the correct message but not showing it correct fuel level. This would indicate the gauge is defective.
Good luck and let me know.
Regards,

Posted on Feb 26, 2009

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