Q: Gas gauge malfunctioning and Service Engine Light on

asked by on

After driving several hundreds of miles, the gas gauge showed that I had plenty of gas, so I kept driving. A short while after that, the engine stopped and I had it towed to a service station. The mechanic found no problems with my truck other than it needed gasoline. Gas was added and it ran fine. After driving a while, I noticed the the gas gauge was still not decreasing like it should. A few days later, when I started driving, the low fuel sensor light chimed and came on. I had just filled up the tank a few miles previous to this, so I knew it could not be low on gas. Now, the low gas light is on constantly, even when I fill up the tank completely. Also the service engine light comes on every time I start the truck. What could be causing these lights to come on?

A: Thank you for asking about your 2006 GMC Si...

Thank you for asking about your 2006 GMC Sierra 1500 HD. More than likely, the problem is the fuel sensor, which is built into the fuel sending unit. This assembly is mounted in the gas tank. This is a common problem with vehicles like yours. Symptoms include incorrect fuel gauge readings and an illuminated Check Engine Light. I recommend having a professional, such as one from YourMechanic, inspect this problem and replace the fuel sensor if necessary.

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Electrical system malfunctioning - 2005 Mercedes-Benz C55 AMG

Hello. The first thing I would check is to make sure that the battery is in good condition. A worn or old battery may not be able to properly power all of the accessories that your luxury vehicle is equipped...

Q: Ten days after dealership fixes car, it quits again

Hello. Sometimes shops can take an excessive amount of time to diagnose and repair your vehicle due to the fact that they have so many other customers at once. One solution I might recommend is that you give YourMechanic a...

Q: Car squealing when I add water to the radiator

The noise you are hearing is cold water hitting hot metal and turning to steam, like a steam whistle. You may have an intake or head gasket leaking where the head and intake meet in the front, or back, of...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...