Fuel Gauge Empty With a Twist
Thread Starter
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
Or even better. Use the car more often and slosh that gas around the tank
Oh and run Techron through regularly.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
I had the same issue on my '99 for a long while. Techron wouldn't quite do it to solve the issue. Finally, I had the dealer update the firmware that I specified from their TIS website. Problem vanished. http://tis2web.service.gm.com/tis2web
Thread Starter
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
I had the same issue on my '99 for a long while. Techron wouldn't quite do it to solve the issue. Finally, I had the dealer update the firmware that I specified from their TIS website. Problem vanished. http://tis2web.service.gm.com/tis2web
Now if it happens again, how to find a dealer here who has the knowledge to do the job?
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Thankfully I haven't had the erratic gas gauge problem on my last two C5s. On my '99 I had it and it seemed like it would occur at just about any fuel level. Dealer replaced the sending units under warranty and never had the problem again.
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Joined: Sep 2005
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From: Southeast, Tennessee
St. Jude Donor '09 thru '26
while it may not be the problem in this case, remember that the C5 has 2 fuel tanks and that they are connected and equalized with a pump. if all of a sudden your "range" seems to be about half of what it is it could also be a fault of that system. it fails to equalize the tanks and could be the cause of the gauge dropping off the charts all of a sudden.
hopefully it is something simple like a stuck sender, but unfortunately, there are other causes also.
hopefully it is something simple like a stuck sender, but unfortunately, there are other causes also.
Thread Starter
Tech Contributor
Joined: Dec 2003
Posts: 19,384
Likes: 87
From: Horncastle Lincolnshire, England
2023 C5 of the Year Finalist - Unmodified
while it may not be the problem in this case, remember that the C5 has 2 fuel tanks and that they are connected and equalized with a pump. if all of a sudden your "range" seems to be about half of what it is it could also be a fault of that system. it fails to equalize the tanks and could be the cause of the gauge dropping off the charts all of a sudden.
hopefully it is something simple like a stuck sender, but unfortunately, there are other causes also.
hopefully it is something simple like a stuck sender, but unfortunately, there are other causes also.
Melting Slicks
Joined: Jun 2008
Posts: 2,283
Likes: 16
From: Katy Tx
I had the same issue on my '99 for a long while. Techron wouldn't quite do it to solve the issue. Finally, I had the dealer update the firmware that I specified from their TIS website. Problem vanished. http://tis2web.service.gm.com/tis2web
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
From: Van Buren Arkansas
Wounded Warrior Escort '11
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