DEF gage problem

[Willrose64]

Anybody out there having the same problem as I am? When towing, the DEF gage is very unreliable......it will show near empty and when I go to top it off I can't put more than 1 gallon in. On my last trip, again while towing, my DEF gage actually increased 1/4 tank over the space of 1 hour of driving. I also filled it up one time and the gage kept reading near empty.

 

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[pigpen23]

There's a service bulletin to get the DEF system recalibrated so you don't have the issue you're explaining. I had it reprogrammed twice, and the second time was after the service bulletin. Been good ever since then.

 

[Willrose64]

So, you are going to love this, just picked up my truck from the dealership and the SB ONLY applies IF you engine throws a code......mine did not. The dealership pushed it up the ladder to GMC and they denied the dealership's request to reprogram it and they denied the request to replace the sensor. I also have a written copy of the conversation between the dealership and GMC and it actually says " Customers need to be encouraged to ignore the gauge under these conditions until the warning strategy indicates a specific speed limitation will be reached". I mean, what the actual F?

 

[TX_Critter]

Yeah it’s an annoyance, I use a banks iDash.

 

[Willrose64]

will the iDash register DEF levels?

 

[TX_Critter]

Yes, and it gives you an actual percentage level that doesn’t depend on current usage rate like the factory gauge does.

 

[gemarsh]

Anybody out there having the same problem as I am? When towing, the DEF gage is very unreliable......it will show near empty and when I go to top it off I can't put more than 1 gallon in. On my last trip, again while towing, my DEF gage actually increased 1/4 tank over the space of 1 hour of driving. I also filled it up one time and the gage kept reading near empty.

Welcome.

As stated the def gauge is a wonky design, at best.