Skip the auto shop - Our mechanics make house calls

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.

Was this answer helpful?

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: Car chugs & dies when gas gauge gets to 1/4 full

The fuel sending unit is not accurate and is empty at 1/4 of a tank, or you have a fuel pump that has a faulty bottom screen which has come off and sucks air below a 1/4 tank. A big...

Q: Car won't start, needs ignition switch replacement - 2002 Isuzu Axiom

Looking at the Isuzu repair documentation, I see no service bulletins that would indicate a programming update for an extended crank or no-start condition although there are software enhancements all of the time and not necessarily a bulletin-related to the...

Q: Air not working consistently

The vehicle may be low on refrigerant, due to a condenser, or compressor leak. If the vehicle blows ice cold one minute, then warm until the vehicle or AC is shut off, then you may have a malfunctioning expansion valve....

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...