Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

2020 Sierra 1500 Base AFM Mode Identification

Recommended Posts

Hey all.  So, my father's 2017 Silverado (base level cluster) shows if the truck is in 8 cyl or 4 cyl AFM mode in the DIC.  However, I cannot seem to find any way to tell what AFM mode I am in on my 2020 Sierra 1500 with the base level cluster/DIC.  Does anyone have any clue how you can tell what mode the truck is running in?  The main reason I'm asking is because I want to get one of the Range AFM disablers, and I'd like to see, live, if it ever switches in to 4 cyl mode.


Thanks in advance for any help you can provide

Link to comment
Share on other sites

I'm a little surprised the AFM engines that are still in use don't have the indicator. 

DFM ones don't because there are so many possible modes.


Even for the '21's are still using the AFM engines in lower trims.

L82 5.3 in the lower trims is an AFM engine.

L84 5.3 in higher trims is a DFM engine. 


4.3L is also still an AFM engine. 




  • Like 2
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.