DEF range low

[JayceeP]

Just an update from my posts a few days ago. Haven’t really driven a lot but check engine light did turn off yesterday as well. Was about a 35 minute round trip highway run. Seems like 45+mins of driving were required to make that ending light go away. The lock out screen was much faster to disappear.

DEF gauge still says full (not sure how) but going forward, when it drops to half, in a jug of DEF will go!

 

[steiny93]

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

my wife's '21 does the same thing when towing, here is a thread of my experience https://www.tahoeyukonforum.com/thr...to-ecodiesel-and-cummins.142632/#post-1795254 GM continues to assert that it's operating as intended

my fix is to not tow with it