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A top commenter said that a ground issue was usually the cause of a stuck on full reading. I’m pretty sure that the PCM sends a voltage to the gauge, which varies depending on where the fuel level is at. So a “bad ground” is not a good answer.
I think the easiest route would be to hook up a scan tool and run a fuel gauge test to test the gauges operation. If the gauge operates correctly, the problem is pre PCM, probably the fuel level sensor. If it does not operate under command from the test, you know the problem is PCM or post PCM (probably gauge or wiring.)
But as eric said, he’s run into this before, so I totally agree on his jump to the fuel sender assembly. Usually the gauge doesn’t go bad, and the only other thing I’ve seen is the PCM will send a nonsense voltage to the gauge because of something in the fuel that sends a voltage spike thru the sensor wire to the PCM.
This was my first post on your site eric, thank you so much for what you do. I am currently an automotive student and I’ve learned so much from your videos.
A top commenter said that a ground issue was usually the cause of a stuck on full reading. I’m pretty sure that the PCM sends a voltage to the gauge, which varies depending on where the fuel level is at. So a “bad ground” is not a good answer.
I think the easiest route would be to hook up a scan tool and run a fuel gauge test to test the gauges operation. If the gauge operates correctly, the problem is pre PCM, probably the fuel level sensor. If it does not operate under command from the test, you know the problem is PCM or post PCM (probably gauge or wiring.)
But as eric said, he’s run into this before, so I totally agree on his jump to the fuel sender assembly. Usually the gauge doesn’t go bad, and the only other thing I’ve seen is the PCM will send a nonsense voltage to the gauge because of something in the fuel that sends a voltage spike thru the sensor wire to the PCM.
This was my first post on your site eric, thank you so much for what you do. I am currently an automotive student and I’ve learned so much from your videos.