I am having a weird issue with my gas gauge, along with a pending P0462 code. It seems to only happen when it is really cold outside. The code has been coming up relatively sporadically, no check engine light on.

My UG shows I have about 7 gallons left in my gas tank, but my gauge reads at empty.

Anyone ever seen this before? I did a search on the forum for this code and didn't come up with anything other than posts which list fault codes.

 

Pretty sure the fuel level is a direct tie to the gauge meaning it does not report to the bcu/ecu/whatever therefore can not be read by the ultragauge. Even so if it could read it would read the same thing that is being sent to the gauge meaning your gauge would be bad (but again the UG cant read fuel level it just guesses so this isnt the case).

 

So is this a bad sensor in the tank? Why would it only throw the code when it is really cold outside? When it warms up, no code, and gas level seems to be more accurate...

 

If your gauge reads empty and it is not then I'd say something is out of calibration/broken. As I said don't trust the ultra gauge reading since I'm pretty sure there is no fuel reading on the ecu so it is a dummy number/guess.

The code looks to be a "fuel level anomaly" code so chances are your sender is spitting out a number that makes no sense hence probably broken.

 

Well the scanguage is innaccurate, pump fill cutoff pressure sensors are inaccurate, and I thought empty was 5 gallons in the tank reserve... so to only be off 2 gallons? I'd say pretty good?

 

Just filled her with gas and the UG was spot on. Tank holds 25.5 according to the manual. UG was reading 7.xx gallons left, and I pumped in about 18 gallons. This morning the gauge was showing empty, but when I went out to lunch and to fill it, it was reading normal again. Not sure what the problem is...

 

Run a test, go to a station, check you level with your scan gauge then fill up you tank, really full and see what you gauge and scanner say

 

Yup, just did that. Once I filled up, gas gauge reads correctly. I'm not sure what does this code mean?

 

Not sure if this applies to a D2, but on my D1 the gas gauge never goes above 3/4, even when full. Then the needle won't move until it actually gets below 3/4 tank. So it's sort of accurate. The Ultragauge has an option for fuel level, but it doesn't work at all. I was told the OBD port has no connection to the fuel sensor in a D1.

 

This is the same in our D2s. The gas gauge is directly connected and fuel level is not reported to the ecu or anything else. The UG measures gas level by you telling it when you refill (after setting the fuel capacity) and then using your MPG to show fuel consumption.