Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) will not be available on certain 2021 model year Silverado 1500/Sierra 1500 pickups

[MS3DALE]

For those that do not like AFM/DFM, You will be able to buy certain 2021's without it....

 

2021 Silverado 1500 and Sierra 1500 pickups

As promised, we want to continue to keep you in the loop regarding the global, industry-wide shortage of semiconductors.  Today, due to this shortage, we are announcing a new change to select light duty full-size pickup powertrains.  Active Fuel Management (AFM) and Dynamic Fuel Management (DFM) will not be available on certain 2021 model year Silverado 1500 and Sierra 1500 pickups.  By taking this measure, it will enable continued production and delivery of inventory to help respond to the strong customer and dealer demand for our full-size pickup models as the industry continues to rebound and strengthen.

 

L82 - 5.3L EcoTec3 V8 w/6-speed Automatic Transmission (MYC) & L84 - 5.3L EcoTec3 V8 w/8-speed Automatic Transmission (MQE) (only):

For orders with a scheduled production date on or after March 15, 2021, GM will build most L82 engines on 1500 pickups without AFM (refer to the updated Order Guide and table below for trim details).  Similarly, for orders with a scheduled production date on or after March 29, 2021, GM will build most L84 engines on 1500 pickups without DFM (refer to the updated Order Guide and the table below for trim details).   Any sold orders of these affected pickups which have not been entered in the Production Order Management and Scheduling system by March 16, 2021 will be built without AFM or DFM.  The dealer has the responsibility to and must advise affected sold order customers immediately.

 

Pickups with 5.3L V8s which are built without AFM or DFM, as applicable, will include a new RPO code added by General Motors: “YK9 – Not Equipped with Active Fuel Management" or “YK9 - Not Equipped with Dynamic Fuel Management". This RPO code will be reflected on the Dealer Invoice along with an associated $50 MSRP credit.  The Monroney label will include this credit and indicate that the vehicle was built without AFM or DFM.  These 2021 Silverado 1500 and Sierra 1500 pickups which are built without AFM or DFM, will also receive revised EPA certified fuel economy estimates.  Chevrolet and GMC are updating all consumer and dealer facing communications as appropriate.  In addition, dealers are strongly urged to counsel directly with all customers who purchase affected vehicles to ensure each customer understands its vehicle content and fuel economy.  This change to the availability of AFM and DFM on the 5.3L V8 is currently expected to remain in place for the remainder of the 2021MY.  A listing of affected trims is listed below and is subject to change by General Motors:

[TNTSierra]

Here is a very interesting article. Those who can’t stand AFM/DFM.  
 

https://www.gm-trucks.com/chevy-gmc-will-temporarily-drop-afm-dfm-fuel-saving-tech-silverado-sierra-1500/

Edited March 15, 2021 by TNTSilverado

[Daly]

My question is that if AFM/DFM is so great for fuel economy, why was it the first system to be dropped? Why not other systems, like LED lights, or wireless carplay, or park assist. Or maybe it's because AFM/DFM really doesn't do much and won't be missed much. 

[Z45]

I bet they don't remove the hardware, just the feature won't be activated.  Back when they started AFM I read a service bulletin on some engines that  stated they were build with the parts but the system was not activated.

[Z45]

3 minutes ago, Daly said:

My question is that if AFM/DFM is so great for fuel economy, why was it the first system to be dropped? Why not other systems, like LED lights, or wireless carplay, or park assist. Or maybe it's because AFM/DFM really doesn't do much and won't be missed much. 

More than likely because of the sophisticated computers that are required with the systems. 

[newdude]

51 minutes ago, elcamino said:

I bet they don't remove the hardware, just the feature won't be activated.  Back when they started AFM I read a service bulletin on some engines that  stated they were build with the parts but the system was not activated.

 

49 minutes ago, elcamino said:

More than likely because of the sophisticated computers that are required with the systems. 

 

 

I'm suspecting it to be a valve oil control solenoid shortage.  The L82/L84 (and L87) no longer use the VLOM assembly under the intake manifold.  Instead, the solenoids were redesigned and are mounted individually per cylinder to do their job. 

 

The ECM is the only "computer" involved with AFM/DFM operation so there is not a second or third computer involved in the operation.  

 

The ECMs aren't any different AFM vs DFM on the L82/L84 (and L87), its all in the calibrations and software.  The 4.3 with AFM and the L8T 6.6 gas that has no AFM at all both share the same ECM as well so difference with or without AFM on two totally different engines.

Edited March 15, 2021 by newdude

[BlancoSilverado]

6 minutes ago, newdude said:

 

 

 

I'm suspecting it to be a valve oil control solenoid shortage.  The L82/L84/L87 no longer use the VLOM assembly under the intake manifold.  Instead, the solenoids were redesigned and are mounted individually per cylinder to do their job. 

 

The ECM is the only "computer" involved with AFM/DFM operation so there is not a second or third computer involved in the operation.  

 

The ECMs aren't any different AFM vs DFM on the L82/L84/L87, its all in the calibrations and software.  The 4.3 with AFM and the L8T 6.6 gas that has no AFM at all both share the same ECM as well so difference with or without AFM on two totally different engines.

Nothing about the L87 being offered without DFM( at this time). 

 

if i was in the market for a new truck i would jump at this opportunity. 

 

I do really want to know the EPA estimates. 

[newdude]

6 minutes ago, BlancoSilverado said:

Nothing about the L87 being offered without DFM( at this time). 

 

if i was in the market for a new truck i would jump at this opportunity. 

 

I do really want to know the EPA estimates. 

 

Correct.  I was being general on the parts they use.  

 

Reuters has a statement from GM about this.  Looks to be a 1mpg loss.  GM builds pickups without certain modules due to global chip shortage, hurting fuel economy | Reuters

 

Quote

The lack of the active fuel management/dynamic fuel management module

 

This line makes me wonder if it is an ECM issue perhaps then?  This would mean they would have had to make a new part # for an ECM because of components changes and that the AFM/DFM hardware will still be installed in the engines. 

Edited March 15, 2021 by newdude

[lmentzel]

My 2011 with AFM disabled has never run better. Shifts right now, engine runs at full temp (210) always. No trans clunk during shifting, no shift hunting. I also noticed first 2 oil changes after AFM disabled the oil filter plugged quick. Hotter engine must be freeing up the sludge. I’m at 175k miles and she feels great! Cab heater also works better without a doubt.

Fuel mileage did decrease.. But drive-ability is so much better I don’t care.

Selecting 1 of 8 cylinders and 1 of 10 trans gears every time you hit the gas will be problematic in any new engine management system. Too many variables..

[Bob2C]

Agreed. I just read some 2021’s are being built without afm due to parts shortage. Some lucky ones will scoop these up

 

https://finance.yahoo.com/amphtml/news/gm-builds-2021-pickups-without-134828278.html

 

 

Sent from my iPhone using Tapatalk

[gmcsierra71]

I would assume this means that you get a V8 Engine from the factory that behaves similar to having a Range device (turning off the AFM\DFM Cylinder deactivation). However, the engine still has the AFM\DFM parts (lifters that periodically fail).

[Bob2C]

I would assume this means that you get a V8 Engine from the factory that behaves similar to having a Range device (turning off the AFM\DFM Cylinder deactivation). However, the engine still has the AFM\DFM parts (lifters that periodically fail).

That would be unknown. Are they still building with those lifters if the engine can’t perform cylinder deactivation?


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[lmentzel]

Hopefully none of the AFM / DFM parts are installed. The 10 speed trans and 8 all the time should work awesome!

 

The few problems I’ve had with 5.3s is directly related to AFM.

 

I am using Range module for disable.

[flattop]

This is great news! These will probably be the last all (8) all the time firing V-8's we get in a half ton stock from the factory. I wonder if the exhaust flaps will get deleted also? Aftermarket exhaust systems will sound great on these engines!

[lmentzel]

This is great news! These will probably be the last all (8) all the time firing V-8's we get in a half ton stock from the factory. I wonder if the exhaust flaps will get deleted also? Aftermarket exhaust systems will sound great on these engines!

And simplifying means they will probably last forever.. [emoji1303]