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Heads Up 3.0L Owners. Def System Re Flash TSB

ILSilverado

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ILSilverado Enthusiast

ILSilverado

Posted
Posted

Well I had the required re flash done for the DEF system and now she is drinking DEF like a $2 hooker drinks Ripple. I would say 50% more def consumption than before. Keep an eye on the DEF gauge folks.

Sierra 3.0 Enthusiast

Sierra 3.0

Posted
Posted

I can confirm.  I had mine done about 2200 miles ago.  I pulled a camper for the first time and, wow, it used a lot of def.  Now back to normal driving and it's still more than it was.  I'm guessing the update solved an emission issue with not running clean enough?

ILSilverado Enthusiast

ILSilverado

Posted
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Posted
9 hours ago, Sierra 3.0 said:

I can confirm.  I had mine done about 2200 miles ago.  I pulled a camper for the first time and, wow, it used a lot of def.  Now back to normal driving and it's still more than it was.  I'm guessing the update solved an emission issue with not running clean enough?

Im guessing so. The regeneration cycles are much more frequent now.

Max Z71 Enthusiast

Max Z71

Posted
Posted

Mine REGENs about every 120 miles. I have a Banks iDash gauge and can see when it goes into REGEN.

 

What is your average distance between REGENs?

ILSilverado Enthusiast

ILSilverado

Posted
  • Author
Posted
20 minutes ago, Max Z71 said:

Mine REGENs about every 120 miles. I have a Banks iDash gauge and can see when it goes into REGEN.

 

What is your average distance between REGENs?

I have not measured mileage vs regens what is this gauge you have?

 

Max Z71 Enthusiast

Max Z71

Posted
Posted

Check the internet for Banks iDash.

 

It is a 52 mm gauge made by Gale Banks that plugs into your OBD II port and reads hundreds of parameters from your truck.

 

One of those is called "REGEN". It tells me if Regen is "OFF" or "ACT" for active. It also has average miles between Regens which mine stays about 120 in my 2000 miles I've had my truck.

 

I have two of them, one for REGEN and the other for temperatures, oil, transmission and water as well as oil pressure.

 

Each gauge can display up to 8 different parameters. 

 

Max

Sierra 3.0 Enthusiast

Sierra 3.0

Posted
Posted

I do not have any specifics on my regens but it's doing it at least 2-3 times on each tank.  I'm a little disappointed in this as the fuel mileage goes down significantly each time.  If these did not have the emission controls the mileage would be incredible.  I have not seen my average to be anywhere near 29 MPG on the highway going 70 MPH.  My average mileage so far has only been around 24-25 MPG and the faster I go on the highway the lower it gets.  Then when regens hits I get 20 MPG.

newdude Senior Enthusiast

newdude

Posted
Posted

https://gm-techlink.com/?p=13143

 

Quote

Under certain conditions, the ECM will increase or decrease the amount of DEF used based on learning or adaptive algorithms. In the event of a malfunction and Check Engine light, the ECM may double or even eliminate the amount of DEF that is being used. An improper amount of DEF use will continue until the vehicle is repaired and the learned value in the ECM is reset.

 

 

I wouldn't doubt that the consumption rate will adjust as the ECM is learning/adapting.  Probably because the reprogram does a hard reset on the system, the ECM is still adjusting the amount of DEF needed.  I'd give it a few hundred miles and see what it does.  

Colossus Senior Enthusiast

Colossus

Posted
Posted

Don't plan on being able to delete the emissions crap off of these newer trucks, the EPA has really cracked down hard on the tuners and such that help with emissions removal. 

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