Fuel gage problem
Thread Starter
6th Gear
Joined: Dec 2006
Posts: 6
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Fuel gage problem
2001 c5 fuel gage reads fine until 3/8 of a tank is left. Gage needle will go to "E". Then when there is 1/8 of a tank left it starts working again. Always used the good gas as well as added Techron. Any thoughts would be appreciated.
Tech Contributor
Joined: Dec 2003
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From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
The normal problem is sulfur build up on the fuel tank sensors causing bad readings at the gauge. The full fix, if Techron doesn't fix it, is to drop the tanks and change the sensors. Its a long job
It m ay be worth persisting with the Techron for a while to see if you can clean it up
It m ay be worth persisting with the Techron for a while to see if you can clean it up
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Racer
Joined: Jun 2007
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From: Jupiter FL
Racer
Joined: Apr 2006
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From: FRESNO CA
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Racer
Joined: Jun 2007
Posts: 468
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From: Jupiter FL
Thanks for the reference. I am aware of how to reset or erase the codes. I though your were referring to some type of "re-flash".
But what the heck I will try the reset route.
Le Mans Master
Joined: Mar 2007
Posts: 6,007
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From: Manteo NC
A very common problem with the C5, I have used Seafoam and Techron both available at Wally World, cleaned up my problem. Make sure to always use a top tier gasoline.
You may have to use several bottles. If that doesn't work check the ground or it could be bad sending units which aren't cheap to replace.
You may have to use several bottles. If that doesn't work check the ground or it could be bad sending units which aren't cheap to replace.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
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From: Van Buren Arkansas
Wounded Warrior Escort '11
There is also a GM software/firmware update for the onboard systems for the fuel gauge. I too was having issues and getting a specific code for the right tank sending unit. After the software update, no more problem.
Racer
Joined: Jun 2007
Posts: 468
Likes: 15
From: Jupiter FL
If this is the case what would be the usual cost of this service.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
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From: Van Buren Arkansas
Wounded Warrior Escort '11
They charged me an hour of labor, $84, to do the updates that I provided to them...part number wise from the GM TIS system
http://tis2web.service.gm.com/tis2web
http://tis2web.service.gm.com/tis2web
