Gas gauge not working properly

Hi,

Since the check engine light is on, the first thing I would recommend is having the can-bus system scanned for codes. CAN stands for controller area network. Basically, all the modules/computers are tied together via a few wires. By performing this type of scan, it will identify faults regardless of what module they are stored in.

Here is a video that shows how it's done:

https://youtu.be/InIlnsjOVFA

Now, if you are unable to have the scan done, it will become a guessing game. If I had to guess, I would say the rheostat on the fuel level sensor has failed. The sensor is in the fuel tank and part of the fuel pump assembly. See pics 1 and 2 below.

When looking at the highlighted part of pic 2, you are seeing a float. That floats on top of the fuel and moves an arm up or down based on fuel level. In turn, the lever moves a contact on a rheostat. A rheostat is nothing more than a resister that, based on the position of the arm, allows different voltages to be signaled to the modules and then the gauge. This is my first suspect, but that is in theory only. That is why I recommended the can-scan. I'm hoping that if this is the problem, it will indicate a low or no signal from this sensor.

If you want to replace it, the fuel pump needs to be removed. To access it, there is a service port under the second-row seat. That is removed first, then you can remove the pump module and assembly.

The remaining pics below are how to replace the fuel pump. This procedure will be completed to access and replace the sensor.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.