DEF range low

[geobern]

My experience is that it takes the system some driving time to update. When I picked up mine at the dealer, it showed half full so I asked them to fill it up which they said they already did. They came with a tank to the lot to top off and it immediately overflowed the tank. They said that it would show full after some driving time, which it did.

 

[JayceeP]

With my 24 Denali I often tow a 3500 lb trailer with a race car. Usually 400 to 600 miles one way. It will always start telling me on the way home that I'm about to run out and go into limp mode. If you stop and add def it might take 2 gallons. If you ignore it and let tell it's go into Limp mode, the screen tells you it is but never happens. On one trip last year I drove the rest of the way home, 250 miles then added 3 gallons. The dealer has been talking to GM about it. It clearly is bad software that they don't have a handle on. I had it to the dealer for 2 days and they are doing there best. this is a GM problem that is very frustrating for the customer. Other than that it's a great tow

That’s good to know. So clearly towing messes up the range calculation (seems to be widely known) so the lingering question is if you have the warning despite having plenty of DEF, will you end up in limp mode? Sounds like no for you. Did you get a software update after this?

 

[Stbentoak]

Unable to Fill the DEF Tank – TechLink

gm-techlink.com

See if this helps....

 

[ducfan]

With my 24 Denali I often tow a 3500 lb trailer with a race car. Usually 400 to 600 miles one way. It will always start telling me on the way home that I'm about to run out and go into limp mode. If you stop and add def it might take 2 gallons. If you ignore it and let tell it's go into Limp mode, the screen tells you it is but never happens. On one trip last year I drove the rest of the way home, 250 miles then added 3 gallons. The dealer has been talking to GM about it. It clearly is bad software that they don't have a handle on. I had it to the dealer for 2 days and they are doing there best. this is a GM problem that is very frustrating for the customer. Other than that it's a great tow

This is worrisome. I have been reading various threads and watching Youtube videos on this very topic. Wondering why GM doesn't yet have a handle on software, warnings and def level while towing? I plan on ordering a Yukon with the LZ0 as soon as available in late March. The symptom I have run across is that owners add def on the road while towing, yet the warnings don't disappear and seem to get more ominous. What to do.