Fuel gauge

snowman44 · January 10, 2021

I have a 2019 TrailBoss and brought my truck to dealer other day because last couple of times I have filled my truck up it does not read full. I have had 5 silverados and fill them up once a week and never had this issue and I am ocd about clicking them several times to make sure it is full. Took it to the dealer and said they scanned it and no codes popped up. Filled it up yesterday and here is a pic of the gauge. Anyone else ever have this happen or suggestions to dealer what to look for?

redwngr · January 10, 2021

There will be diagnostic information available to the dealers technician to test that the sender in the tank and the gauge in the dash.

You shouldn't have to tell them anything other than the symptoms.

snowman44 · January 11, 2021

They did scan it and said there were no issues but the gauge is stillnot reading correctly.

redwngr · January 11, 2021

Was it full when you took it in?

RWTJR · January 11, 2021

Did you fill it up at the same gas station each time it read low? Could the pump be shutting off prematurely? Maybe try another gas station and see if still happens.

How close is the dealership to you and a gas station? Maybe you could ask to have a tech go with you to fill it up so he can verify the issue.

Just throwing out some thoughts.

No expertise implied or expressed

Car Dude · January 12, 2021

My 19 does the same thing. Its been like that since the day I drove it off the lot.

snowman44 · January 13, 2021

I have tried other gas stations and same result. This is ridiculous. The amount of money you pay for a new truck and two years old and gas gauge does not read correctly. I offered to take tech to gas station and said they did not have time.

redwngr · January 13, 2021

Picture shows it has 24,000 miles, so if it's two years from new purchase it's still under 3/36,000 bumper to bumper.

Failures happen, it's how dealer handles it that is important.

What are they proposing for the next step in diagnosis/repair?

ericarenee · January 13, 2021

i would just call them to make a appt to drop it off so they can diagnose and repair the Under Warranty fuel gage not registering correctly issue previously brought in for . ask them when is a good time for them to have a Loaner truck ready for you to use until they get your Truck issue solved.

This will nicely put them on the spot ,Letting them know its there issue without being to aggressive. if they refuse then call GM for help.

this showing wrong would be drive me beyond my ability to function

Nice and polite but firm works better then a shouting match

Good Luck.

Silvarado2021 · December 15, 2022

2021 Silvarado is doing the same thing except it will randomly drop to zero also.

Bikerjon · December 15, 2022

I have seen this problem on other trucks and it is caused by a poor ground connection at the fuel level sensor. This sensor is difficult to see, get at and test. The tank needs to be dropped down or removed to get at the sender. This procedure is more difficult with a full tank of gas. This fault may not set a code. I am sure your dealer does not want to drop the fuel tank just to "take a peek" without verifying the complaint.

My advice to you and Silverado2021 would be to take a photo of the fuel gauge after you have filled it up, take it to the dealer and describe this fault in detail. Be polite but firm when you explain that this truck is under warranty, has a small fuel tank (24 gallons} and you need to get this fixed ASAP. It may be possible to plug in a new fuel sender to the existing vehicle wiring using a known good external ground and slowly "sweep" the sender from empty to full

to test the gauge in the dash and truck wiring. After the tank is removed it would make a lot of sense to replace the sender because of the labor time involved.

If your dealer will not attempt to repair this problem under warranty have them give you the contact for Chevrolet Customer Service. Chevy should take care of you.

Chevrolet1 · December 18, 2022

On 12/15/2022 at 5:42 PM, Bikerjon said:

I have seen this problem on other trucks and it is caused by a poor ground connection at the fuel level sensor. This sensor is difficult to see, get at and test. The tank needs to be dropped down or removed to get at the sender. This procedure is more difficult with a full tank of gas. This fault may not set a code. I am sure your dealer does not want to drop the fuel tank just to "take a peek" without verifying the complaint.

My advice to you and Silverado2021 would be to take a photo of the fuel gauge after you have filled it up, take it to the dealer and describe this fault in detail. Be polite but firm when you explain that this truck is under warranty, has a small fuel tank (24 gallons} and you need to get this fixed ASAP. It may be possible to plug in a new fuel sender to the existing vehicle wiring using a known good external ground and slowly "sweep" the sender from empty to full

to test the gauge in the dash and truck wiring. After the tank is removed it would make a lot of sense to replace the sender because of the labor time involved.

If your dealer will not attempt to repair this problem under warranty have them give you the contact for Chevrolet Customer Service. Chevy should take care of you.

Agree wit Bikerjon here. My 2019 has never shown this symptom. I can let any gas pump click (auto shut off) once, and my gauge will show the tank is on full.

mjm-1957 · December 18, 2022

The dealer should perform a gauge sweep with GDS to make sure the cluster is good. They can make all the gauges go from full to empty..If it checks out then time to check the level sensor in the tank.