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2022 3.0 Duramax Def Range low but Gauge reads full???

Chris Gardner
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Chris Gardner New Member

Chris Gardner

Posted
Posted

Any one have this issue with def range low popping up in cluster with mileage range calc but your def indicator lights show that it’s full?


Also says on App too that it’s range is low?

pic below.

 

IMG_5791.png

IMG_5793.jpeg

  • 4 weeks later...
GMCustomerService Senior Enthusiast

GMCustomerService

Posted
Posted
On 7/1/2023 at 3:30 PM, Chris Gardner said:

Any one have this issue with def range low popping up in cluster with mileage range calc but your def indicator lights show that it’s full?


Also says on App too that it’s range is low?

pic below.

 

IMG_5791.png

IMG_5793.jpeg

This is certainly not what we like to hear, Chris Gardner.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with the DEF not showing the correct levels on your truck. To do so, please send an email to [email protected] with ATTN: Chris Gardner/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s Privacy Policy, please visit https://www.gm.com/privacy-statement.html. The information you provide may be monitored and recorded and is subject to the GM Privacy Statement.
 
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redwngr Senior Enthusiast

redwngr

Posted
Posted

On my '23, myGMC seems to always report the DEF level information as 'unavailable'. 

 

I have noticed that in truck DEF level gauges sometimes are slow to change after a refill. (not just on this '23)

 

 

 

  • 4 weeks later...
BCelina New Member

BCelina

Posted
Posted

New '23 GMC AT4 with 3.0 Diesel...  I have the same issue with a full Def tank, but an alert "DEF Range Low" in the App.  At 1219 total miles on the truck, I had to fill the def tank (DIC said 198 miles remaining).  I have driven another 500 miles (total 1721 miles) and am down 1/3 DEF tank already.  My dealer says this is normal, but I think this is quite excessive.

redwngr Senior Enthusiast

redwngr

Posted
Posted
59 minutes ago, BCelina said:

New '23 GMC AT4 with 3.0 Diesel...  I have the same issue with a full Def tank, but an alert "DEF Range Low" in the App.  At 1219 total miles on the truck, I had to fill the def tank (DIC said 198 miles remaining).  I have driven another 500 miles (total 1721 miles) and am down 1/3 DEF tank already.  My dealer says this is normal, but I think this is quite excessive.

What level does the info page in the truck say?

 

 

BCelina New Member

BCelina

Posted
Posted

The current def level is about 2/3 full.  But there is an alert on the GMC app "DEF Range Low".  There is no alert on the Drivers Information Center (DIC) about DEF however, I read that the DIC only displays low range alerts at 1000 & 300 miles to empty.  So, I am interpreting with 2/3 full DEF tank, I am within 1000 and 300 miles on DEF range.

redwngr Senior Enthusiast

redwngr

Posted
Posted

I'd be ignoring the phone app and going by what the truck is indicating. 

Mine phone app always indicates def info unavailable -- but I've notice the other info is not always fully up to date. 

 

 

What are you doing with the truck?

What type of fuel mpg are you getting when you check it at fill ups? 

DEF usage should be about 2% of fuel usage. 

 

 

Because def usage is so low compared to fuel usage, a small difference in measuring def added (was it filled the same both times) can make a big difference in calculated DEF mileage.

For this reason I run the def tank down to empty or vary close and use a bulk pump to ensure I can get the tank completely filled without having to deal with a jug with some leftover in it. 

 

I also don't believe the DEF page is accurate enough to use for calculating the DEF mileage. 

Each segment does not indicate the same amount of fluid.

When viewing the page, is the segment above the current one 'just turned off' or is the current segment just about to turn off? 

 

 

Fill, record odometer, drive for 1000's of miles, refill and accurately measure def added -- hand calculate mileage.

 

For comparison, my LZO fuel consumption is running about 28 usmpg with my usage. (so not high speed, not towing and little elevation change)

Truck has about 5500 miles and I have not added def since taking delivery.

 

Idash and truck 'def level info page' agree that the truck has about 1/3 tank of DEF left.

I'm expecting it have similar overall consumption as my LM2 --  approx 1200 miles per def gallon.

 

 

 

redwngr Senior Enthusiast

redwngr

Posted
Posted

DEF page detail taken from 2023 3.0 manual (the 6.6 has a larger tank)

image.thumb.png.bd393c1a5cbd16deade1ac4525e4462b.png

 

The 2023 LZO tank holds 5.4 gallons, so when like the last line (when it will take 4 gallons) it still has 1.4 gallons in tank.

Daily driving that will be +/-1500 miles til empty on mine.  (And then the 500 miles to speed restriction begin)

I'll need fuel twice to drive 1500 miles -- and where there is fuel there is def

(ya, maybe extremely isolate areas there may be fuel and no def, but if I'm going there then part of my preparation is filling the def tank)

 

 

Lack of accuracy example:

 

Drove 2000 miles since DEF tank was completely filled.

Decide to check the DEF page. (intentionally not calling it a gauge)

DEF page is showing top 4 segments off.  

But -- perhaps the 4th segment just went off, or maybe the 5th segment is about to go off -- so somewhere around 1.5 to 2 to 2.5 gallons can be added. 

 

2000 miles / 2.5 gal --- 800 miles per gallon

2000 miles / 2 gal --- 1000 miles per gallon

2000 miles / 1.5 gal ---- 1333 miles per gallon 

 

So, using just the def page, we really have no idea about the def usage.  (which is why I don't call it a gauge...)

1333 is way way more than 800....

 

 

Otoh, I'm not sure all this really matters.

If not trying do detailed tracking of DEF mileage just wait for the 1000 mile warning and dump in a 2.5 gallon jug.  

I'm doing it for '****** and giggles'.

 

 

 

 

 

  • 1 month later...
Kicker0927 Enthusiast

Kicker0927

Posted
Posted (edited)

I have this same 

On 7/1/2023 at 3:30 PM, Chris Gardner said:

Any one have this issue with def range low popping up in cluster with mileage range calc but your def indicator lights show that it’s full?


Also says on App too that it’s range is low?

pic below.

 

IMG_5791.png

IMG_5793.jpeg

 

 

I'm having this same exact issue with my 2023 AT4 (3.0L).  I have around 500miles on the truck and my DEF indicator in the truck is only down one line from full.  However, my MyGMC app has been showing DEF Range Low since a week after I got the vehicle.  Everything else in the app seems to be working fine...sometimes my PSI might be off by 1 or 2, but no biggie. GM tells me the DEF Range Low issue is an OnStar issue since only my app is giving me false info.  OnStar has elevated my complaint like 5 times now and gone through diagnostics over the phone with me like 10x.  I don't know if its an app issue or if there is something within the truck that isn't feeding correct info to the app, specifically the DEF Range.

 

I want to clarify that I don't get any warnings or popups in my vehicle cluster or dashboard...the ONLY issue is the app reporting DEF Range Low.

Edited by Kicker0927
redwngr Senior Enthusiast

redwngr

Posted
Posted
7 hours ago, Kicker0927 said:

I have this same 

 

 

I'm having this same exact issue with my 2023 AT4 (3.0L).  I have around 500miles on the truck and my DEF indicator in the truck is only down one line from full.  However, my MyGMC app has been showing DEF Range Low since a week after I got the vehicle.  Everything else in the app seems to be working fine...sometimes my PSI might be off by 1 or 2, but no biggie. GM tells me the DEF Range Low issue is an OnStar issue since only my app is giving me false info.  OnStar has elevated my complaint like 5 times now and gone through diagnostics over the phone with me like 10x.  I don't know if its an app issue or if there is something within the truck that isn't feeding correct info to the app, specifically the DEF Range.

 

I want to clarify that I don't get any warnings or popups in my vehicle cluster or dashboard...the ONLY issue is the app reporting DEF Range Low.

 

The DEF report on the app has never worked on my 2023.

The app always says def info is 'unavailable' or something like that. (doesn't say def low) 

 

The DEF level page on the DIC does work. 

It gave the '1000 miles to def empty' warning the other day.

iDash said the tank was at about 20-25%.

DIC def level indicator has the tiny segment and the first full size segment active, teh others off. 

Today all segments on the DIC indicator are off, iDash says between 15 and 20%.

 

Truck ('23 LZO) has about 7200 miles on it.  I haven't added any DEF yet. 

Plan to fill at a metered bulk pump in the next day or two. 

 

Was planning to not fill until it gave the 'DEF empty' and '500 miles to speed limit' warnings, but that's not gonna work out this time.

 

 

  • 2 months later...
Loadmaster Enthusiast

Loadmaster

Posted
Posted

redwngr, Did you ever find an answer to your DEF issues?  I just posted the thread about mine.  I have just about the same mileage as you did when you posted your thread. 

redwngr Senior Enthusiast

redwngr

Posted
Posted
56 minutes ago, Loadmaster said:

redwngr, Did you ever find an answer to your DEF issues?  I just posted the thread about mine.  I have just about the same mileage as you did when you posted your thread. 

I don't think I have a DEF  'issue', I have a myGMC phone app issue -- and it's always had issues in Canada.

 

Everything in the truck is still working fine.

The app on the phone still says DEF information unavailable.  (also doesn't give mpg info for my truck, buys does for her Acadia....). 

 

I ended up not waiting til it gave the 'empty now' messages. 

Def range was at 298 miles, all bars on def level indicator were 'off', iDash said level was 11%.

 

Filled with bulk in semi lanes at a FlyingJ.

C$25.43, 18.71L  -- so about US$18.60 / 4.94 usgal (so just under 2 jugs) 

 

image.png.dd0a46fc65552ae7ceef064417dea940.png

 

I was expecting the DEF mileage to be 1200 - 1300.

We'll see if it repeats on the next fill.

 

 

 

 

 

Loadmaster Enthusiast

Loadmaster

Posted
Posted

I appreciate your reply.  I have the same issue as you and many others.  I don't know if it is the app, or the way data is given from the vehicle.  It would be nice if GM would fix it, but I won't hold my breath.

 

My bigger issue is the wrong reporting DEF level.  Dealership did a reset and data dump.  This seems to have corrected the panel warnings, but the DEF level still shows less than what is really in the tank.

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