Jump to content

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

MS3DALE
 Share

Recommended Posts

ratman6161 Enthusiast

ratman6161

Posted
Posted (edited)
On 8/1/2021 at 2:29 PM, Dave Felten said:

I recently purchased a 2021 RST with a 6.2 L 10spd.  How do I verify if it has AFM/DFM or not?  I don't see any display of deactivated cylinders on the drivers displays.  I've read that certain engines were not equipped with AFM/DDM due to chip shortages, wondering if mine is missing that component or not.  Thanks.

This will be specifically identified in the window sticker.  Mine says "credit-not equipped with dynamic fuel. Management -$50"

 

 

Edited by ratman6161
  • Like 1
  • Replies 99
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

MS3DALE
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 k

Daly
Daly

Nobody is complaining about them taking it away, their applauding it.  If there is a complaint, it's that the 6.2 isn't included.

flattop
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 exha

Posted Images

remanaz Enthusiast

remanaz

Posted
Posted
On 7/26/2021 at 6:32 AM, honkongphooey said:

I have been reading threads and articles on AFM - problems, performance, benefits etc and am leaning toward disabling AFM (NOT DELETE) and know about driving in L5 (mines a 2021 custom with 6 speed) to not engage cylinder deactivation.  I tried an experiment where I drove 10 miles on highway at 65 in L5 and cruise on and got 20.2mpg at 2000rpm. I then drove same stretch in Drive at 65 with cruise control on at 1500rpm. got same mpg of 20.2.  would have though there would be a difference. any ideas why not?

 

At that speed our trucks become to much of a brick in the wind for cylinder deactivation to activate it seems. Do the same at 45-50 and you should see a huge difference. I can see 26-28 at these speeds while only seeing 19-20 at 65.

  • 4 weeks later...
Bignbald New Member

Bignbald

Posted
Posted

Traded 2018 LT Silverado  2 weeks ago for 2021 trailboss custom  without AFM! 
oh what a glorious day!!!!! Fuel mileage is worse, compared to the 18 best I could figure, it is about 1 1/5 miles to the gallon😜 But who freaking cares it’s a V8 24/7!  Plus this truck just looks and feels better than the 2018! 

 

  • Like 1
  • 3 weeks later...
shakenfake Senior Enthusiast

shakenfake

Posted
Posted

They all have the same lifters and camshaft so technically everyone has DFM. It should tell you when you go drop cylinders and the exhaust note will change.

Dirk13 Enthusiast

Dirk13

Posted
Posted
2 hours ago, shakenfake said:

They all have the same lifters and camshaft so technically everyone has DFM. It should tell you when you go drop cylinders and the exhaust note will change.

Don’t believe the new trucks have any indicator on the dash at all as you describe. 
 

If you want to know if you have it scan the QR code in the drivers door and look to see if it has build code YK9. If it does, you do not have afm/dfm. If it does not, you do

shakenfake Senior Enthusiast

shakenfake

Posted
Posted

Ah haven't drove a new truck so couldn't tell you. I just remember in my dad's K2XX Suburban it was like that

  • 1 month later...
Jackseric Enthusiast

Jackseric

Posted
Posted

My 2021 Silverado HC has the 6.2L / 10spd combo and no AFM and no stop/start.  Coming from a 2014 Sierra Denali with 5.3L 6spd, with AFM.  This new one is incredible. Instant power and the drivetrain feels so much more solid and stable.

 

When looking at the new ones, the 6.2 window sticker shows better fuel economy than the 5.3... but I am definitely getting a little worse than the old truck did.  Not much worse, but a little.  I'm pretty sure it's because my new shoes are heavier than before... I can't seem to stay off that gas pedal.  😜

Z45 Senior Enthusiast

Z45

Posted
Posted

I just noticed 2 local GM dealers got an influx of trucks recently (over 20 between them, 21 and 22 models) and they all have DFM.  What they don't have is Stop/Start. 

  • 3 weeks later...
haider320 Enthusiast

haider320

Posted
Posted (edited)

So, I've had my 21 SLT X31 for 3 weeks.  Just looked at my build sheet and I do not have DFM.  I also do not have the HD radio.  Both show a 50.00 credit. So I'm assuming, with no DFM, I will not to have to worry about the lifters collapsing?  Build date 10/21.  I do have stop/start.

Edited by haider320
Byrds8 Enthusiast

Byrds8

Posted
Posted
1 hour ago, haider320 said:

So, I've had my 21 SLT X31 for 3 weeks.  Just looked at my build sheet and I do not have DFM.  I also do not have the HD radio.  Both show a 50.00 credit. So I'm assuming, with no DFM, I will not to have to worry about the lifters collapsing?  Build date 10/21.  I do have stop/start.

I have had mine a week now. No DFM either. Although it shows I have HD Radio on the screen, I have yet to get it to work. My build date is 7/21 according to the sticker. Guess the dealership had this one laying around a while.

milkmaster Enthusiast

milkmaster

Posted
Posted
8 hours ago, Byrds8 said:

I have had mine a week now. No DFM either. Although it shows I have HD Radio on the screen, I have yet to get it to work. My build date is 7/21 according to the sticker. Guess the dealership had this one laying around a while.

 mine built in June is the chip shortage truck too.  I also have the HD radio , but I found it in settings where I had to turn it on. 

Byrds8 Enthusiast

Byrds8

Posted
Posted (edited)
1 hour ago, milkmaster said:

 mine built in June is the chip shortage truck too.  I also have the HD radio , but I found it in settings where I had to turn it on. 

The button on my screen turns mine on and off. Even looking through browse, it shows up no HD stations even though I know there are some in my area.

Edited by Byrds8
milkmaster Enthusiast

milkmaster

Posted
Posted
2 hours ago, Byrds8 said:

The button on my screen turns mine on and off. Even looking through browse, it shows up no HD stations even though I know there are some in my area.

Mine did the same until I turned it on in settings.  The radio screen icon now goes to active when it is in HD.  It didn't do that before when I thought it should.  That's why I started looking in the settings menu.  Maybe yours is different.

Byrds8 Enthusiast

Byrds8

Posted
Posted

Yeah I had gone out there and looked. If I turn it on in the settings the sound goes away just like touching the on screen button. Not sure what is going on with it but it is on my list of things when I take it in on Saturday.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • KARNUT
      2027 GMC Sierra: Official Discussion

      By KARNUT · Posted

      It wouldn’t have happened if the government hadn’t mandated outrageous fuel mileage standards. It does very little for the consumer. It adds cost. Back during Covid there was a chip shortage. They gave a rebate for your truck if it didn’t have the chip to turn on cylinder deactivation. It was 50$ because at best you may see 1/2 a mile increase per gallon. Splitting hairs each fuel mileage trick wasn’t mandated. The government doesn’t do the engineering work and say use this until it’s already in use and they like it. The fuel mileage was mandated. And those add ons the results. There’s a mandate and they are the results.
    • newdude
      2027 GMC Sierra: Official Discussion

      By newdude · Posted

      It was never mandated.  Ever.    Automakers were incentivized to install it by getting CAFE credits to help with their vehicle fleet fuel economy scores.  They were being handed money/CAFE credits to install it.  Which is NOT a mandate.       The current admin removed the incentives that were behind them installing it.       
    • lanaderay
      5 Best Slide Down Gameplay Tips! 

      By lanaderay · Posted

      Are you playing Slide Down endlessly but your score is still low? Are you constantly crashing into obstacles as the game speed increases? Don't worry, this article will share 5 invaluable tips to help you master the race and impress your friends. Golden Rules 1. Look one step further. The mistake of 90% of new players is only staring at their character. The secret of experts is to look towards the top of the screen (where the slide is about to appear). This gives your brain an extra 0.5 - 1 second to process the situation and determine the direction of movement before the obstacle approaches. 2. Use gentle movements; don't swipe too hard. Slide Down is very sensitive. Moving your finger too forcefully or with excessive amplitude will cause your character to be thrown off course or crash into a wall. Practise moving your finger with small, decisive, and precise movements. 3. Don't be greedy for gold in dangerous locations. Gold coins are tempting for buying skins, but life is more important. If you see a gold coin right on the edge of a cliff or next to a spike trap, ignore it. Our goal is a High Score, and your score only increases if you survive. 4. Make the most of Power-ups. During the slide, you'll encounter items like Magnets (attract gold) or Shields (temporary invincibility). Never miss them! Especially the Shield, it's your "get out of jail free card" to help you get through those deadly fast sections. 5. Stay calm when speed peaks. When your score exceeds 500 or 1000, the game speed will be very fast. At this point, don't try to think logically; let your natural reflexes work. Take deep breaths and don't panic. Apply these 5 tips to your next game, and your leaderboard will surely improve dramatically. Good luck climbing the Slide Down leaderboard!
    • lingyuair
      Why I Recommend a Desiccant Air Dryer for Cleaner, Drier Compressed Air

      By lingyuair · Posted

      If you use compressed air regularly, one problem you cannot ignore is moisture. Water in the air line can cause rust, unstable air pressure, poor tool performance, and even damage to sensitive equipment. That is why I highly recommend using a desiccant air dryer. A desiccant air dryer is designed to remove moisture from compressed air by using drying materials such as activated alumina or molecular sieve. Compared with basic water separators, it can achieve much lower dew points, making it especially useful for applications that require dry and stable air. For workshops, painting systems, pneumatic tools, CNC machines, laser cutting equipment, and industrial production lines, a desiccant air dryer can make a big difference. It helps protect equipment, improve air quality, reduce maintenance costs, and extend the service life of the whole compressed air system. Another advantage is reliability. Many desiccant air dryers are built for continuous operation and can maintain stable drying performance even in demanding environments. For users who care about long-term efficiency and equipment protection, this is a smart investment. When choosing a desiccant air dryer, I suggest paying attention to air flow capacity, working pressure, dew point performance, regeneration method, and maintenance requirements. A good model should match your compressor system and actual air consumption. Overall, if moisture is causing problems in your compressed air system, a desiccant air dryer is definitely worth considering. It is practical, efficient, and highly useful for anyone who needs clean, dry, and reliable compressed air.
    • Jsdirt
      2027 GMC Sierra: Official Discussion

      By Jsdirt · Posted

      My brand new 2007 Silverado's wax frame was rust from end to end partway through it's SECOND winter here in MA. That stuff is completely useless.    

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...