Tech 2 ?

[silvdur]

Does the Tech 2 tool allow you to modify/calibrate the E-F lines of the fuel gauge?

[DmaxMaverick]

No, it doesn't. It is a GM fuel gage. You'll have to resort to paper/pencil, or commit the formula to memory. Or, do like the rest of us, and guess.

However, if your needle has just moved out of the blue, to a new range, you can use a Tech II to compare the BCM/PCM reported fuel level % to the gage reading. If the gage matches the %, then the sender is going away. If they are different, then the gage is going away. In any case, the gage is a dumb-slave, and only indicates (supposedly) the % of the fuel level data in an analog display.

[silvdur]

Gauge has a 25% error / reading low by 25%

[silvdur]

My 07 classic 2500 was dead on, my 07 NBS 2500 has a 25% low error.

[DmaxMaverick]

Sounds like a tank sender error. Perhaps the float is bent, defective, or something. If it's consistent, but just regularly off by a specific level, I'd suspect the sender. It could be the gage, with the needle off position. Bad parts happen, even when new, on a new vehicle. A check with a Tech II would identify the source.

[Kennedy]

I think this is the age old "why do I only put 2x gallons in my 26 gallon tank when I refill at the low fuel light" thread.

I believe from a possible email conversation the tank takes 19 gallons from the low fuel light. I don't recall what I add to my 07, but I seldom run to the low fuel light. Not sure if and why the new body style would be any different.

I could recalibrate the gauge to go deeper, but a larger Titan tank (and recalibration) is the ultimate answer. That way you can get the range and still leave several gallons in the tank.