View Poll Results: Have you had problems?
Yes
4
5.26%
No
72
94.74%
Voters: 76. You may not vote on this poll
Fuel level
Team Owner
Joined: Apr 2013
Posts: 26,196
Likes: 4,323
From: Chirper Island
The gas gauge stopped working on my 2014 back in the summer of 2019. Turned out to be a sensor in the "B" tank. The onstar app would show me the fuel level but the gauge would not work. It took one week and they had to take damn near the entire back of the car apart. GMEPP sent a rep to the dealer to prove it was the sensor and apparently it was so they approved the work. Total cost was $2200 including a 4 wheel alignment completely paid by GMEPP. Now this summer (2022) it stopped working again only this time it's intermittent. Sometimes it works and sometimes it doesn't and always throws a check engine light at the same time. Always shows tank "B" sensor. Dealer says they haven't seen this problem on any other C7. Now I can't use the onstar app to check the gas level anymore because the car is 2G and the app no longer works. I wonder why the onstar app would show the gas level but the gauge won't. In the spring I'll have to have it replaced again.
I've posted about this a few times.
Where does the OnStar app get their gas level from? When my '14 fuel level sensor went south, OnStar kept giving me accurate measurements. Some thought that it just counted down from when it stopped reading.
But it doesn't account for when you fill up, and the app knows. No one has ever answered this.
Drifting
Joined: Jun 2013
Posts: 1,428
Likes: 478
From: Maryland, USA
no issues yet, only had the car for alittle over 2 years now and filled up a hand full of times only. I have used the techron treatment a fuel times as well after researching on here it was a good thing to do.
Pro
Joined: Nov 2013
Posts: 693
Likes: 158
From: Milwaukee WI
The gas gauge stopped working on my 2014 back in the summer of 2019. Turned out to be a sensor in the "B" tank. The onstar app would show me the fuel level but the gauge would not work. It took one week and they had to take damn near the entire back of the car apart. GMEPP sent a rep to the dealer to prove it was the sensor and apparently it was so they approved the work. Total cost was $2200 including a 4 wheel alignment completely paid by GMEPP. Now this summer (2022) it stopped working again only this time it's intermittent. Sometimes it works and sometimes it doesn't and always throws a check engine light at the same time. Always shows tank "B" sensor. Dealer says they haven't seen this problem on any other C7. Now I can't use the onstar app to check the gas level anymore because the car is 2G and the app no longer works. I wonder why the onstar app would show the gas level but the gauge won't. In the spring I'll have to have it replaced again.
Ever use Techron?
Do you use gasoline with Ethanol?
Team Owner
Joined: Jul 2004
Posts: 28,353
Likes: 3,253
From: Hartford WI
Never had any reason to use the snake oil.
93 octane E0 gas isn't easy to get and even if you do, it isn't always fresh. Besides, we have been using E10 for a long time and I have to believe that the system is designed for ethanol resistance.
Race Director
Joined: Oct 2011
Posts: 15,037
Likes: 1,613
From: Holly Springs NC
St. Jude Donor '16-'17,'22,'24
No problems. My C7 is a garage queen for sure, but it only sees one brand of gas, Shell 93 octane. Don't know if Shell has the additives similar to Techron but my C5 used Shell and it had no problems with the gas guage.
Le Mans Master
Joined: Aug 2015
Posts: 6,884
Likes: 2,884
From: Toronto
Yes... Shell is Top Tier and is what GM recommends.
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