Definitely sounds like a run-a-round, they are just saying something to get the customer to go away. But I suppose these days with the fancy computer systems the engineers design into the gadget laden cars it is possible the fuel tank has to be topped off at least one time (for a brand new car, or if the battery goes dead) in order for the tank calibration to initialize. Let’s give them the benefit of the doubt on that one, so the thing to do is top off the tank, and see if that fixes that fuel gauge problem.
One time I had a desk top a that if it was displaying an error message, I couldn’t turn it off. But I couldn’t get rid of the error message without turning the computer off. A classic Catch 22. So while it seems weird I admit, it is quite possible that when any error message is being displayed, the error message is given ownership of the screen, and the back up camera won’t work. But if snow on the sensor causes this error message, well, that’s a problem the manufacturer needs to address with a software update – and soon.
I’ve told this story here before, but I had a fuel pump relay problem with a car years ago. The dealer shop had the week prior installed new wiring to the fuel pump relay circuit to address a recall. It caused the fuel pump relay to burn out, made it smell really bad, and the fuel pump to run even if the engine wasn’t running. So I took the car in for service again, but before I dropped it off I marked the burned out fuel pump relay by taking a small triangular file and filing a little notch in the plastic cover, near one corner. I also noticed the other side of the plastic case had melted and warped.
When I explained the situation, the shop manager said it was “impossible” the tech had mis-wired the fuel pump circuit, and the fuel pump was “supposed” to run all the time, even if the car wasn’t running. But he said he’d take a look at it. When I came back to pick up the car, I asked if they had found the wiring error they made, fixed it, and had replaced the fuel pump relay with a new one? The manager said “No, there was nothing wrong”. I immediately noticed upon starting the car the fuel pump no longer ran with the engine off. And I pulled the fuel pump relay, and it was a new one, not the warped one I had marked. And the wiring had been corrected. I returned to the office and showed the new fuel pump relay to the manager. I showed where I had marked the old one, where the old one was warped, and that the old one had a burn smell to it, but not this one. He said “Whatever! That’s the same relay! Nothing was wrong!”. … lol …