Page 1 of 2 12 LastLast
Results 1 to 20 of 32

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Member
    Join Date
    Jul 2013
    Location
    Woodstock, GA
    Posts
    49

    Range Active Fuel Management Device for GMC - Worth it?

    I got a 2015 GMC Sierra a few months ago and I am not a big fan of the AFM system. Has anyone out there used the Range AFM Disable device? Does it perform as advertised and how have you liked it? Thank you.

  2. Member
    Join Date
    Aug 2016
    Location
    Colbert co. Alabama
    Posts
    3,441
    #2
    Just curious, what do you not like about it?

  3. Member
    Join Date
    Jul 2013
    Location
    Woodstock, GA
    Posts
    49
    #3
    Quote Originally Posted by gehol View Post
    Just curious, what do you not like about it?
    The shifting from 8 to 4 when driving around town is loud and its an aggressive shift. I would just rather run on 8 cylinders the entire time. On the highway it definitely makes a difference in gas mileage and the shifts are seamless. However, I cruise around town mostly and would prefer to not have it shift back and forth.

  4. Member
    Join Date
    Jul 2013
    Location
    Benton, AR
    Posts
    2,390
    #4
    Quote Originally Posted by magnumspots View Post
    The shifting from 8 to 4 when driving around town is loud and its an aggressive shift. I would just rather run on 8 cylinders the entire time. On the highway it definitely makes a difference in gas mileage and the shifts are seamless. However, I cruise around town mostly and would prefer to not have it shift back and forth.
    I believe I would take the truck back to the dealer and have it checked. I have a 2016 GMC and am totally unaware when the AFM goes to four cylinder until I toggle to a screen that indicates 4 or 8 cylinder. If I did not want the system to shift into four around town I would just run in M5.

  5. Ranger Boats Moderator jc2bg's Avatar
    Join Date
    Sep 2009
    Location
    Findlay, Ohio
    Posts
    12,932
    #5
    Quote Originally Posted by RFSims View Post
    I believe I would take the truck back to the dealer and have it checked. I have a 2016 GMC and am totally unaware when the AFM goes to four cylinder until I toggle to a screen that indicates 4 or 8 cylinder. If I did not want the system to shift into four around town I would just run in M5.
    Which is what I have done with my last 3 GM trucks. I like the shifting better in M5, it has more torque, and gets better fuel economy when towing, which is pretty much all I do. Not a single problem with AFM when not towing, though. My current truck is a 2015 Silverado.
    John Clark — Findlay, Ohio

  6. Banned
    Join Date
    Apr 2009
    Location
    Bridgewater, NS
    Posts
    9,054
    #6
    Quote Originally Posted by RFSims View Post
    I believe I would take the truck back to the dealer and have it checked. I have a 2016 GMC and am totally unaware when the AFM goes to four cylinder until I toggle to a screen that indicates 4 or 8 cylinder. If I did not want the system to shift into four around town I would just run in M5.
    Same engine and system on my 2014.
    I can sometimes BARELY notice it on the highway when it goes to 4 cyl and back to 8 cyl, but have NEVER noticed it in town or city driving.

  7. Matt20xd
    Guest
    #7
    Have it on my 2010. It works as advertised. No complaints.
    Just have to unplug it every month or so as the factory system overrides it.

  8. Member Especial Bryanmc57's Avatar
    Join Date
    Aug 2004
    Location
    Mineola, TX
    Posts
    16,701
    #8
    Quote Originally Posted by Matt20xd View Post
    Just have to unplug it every month or so as the factory system overrides it.
    I'd never heard of that happening...


    Honora Primum Vel Nullum Omnin Honorem

  9. Member
    Join Date
    Jul 2007
    Location
    Danville, Iindiana
    Posts
    8,509
    #9
    Quote Originally Posted by Matt20xd View Post
    Have it on my 2010. It works as advertised. No complaints.
    Just have to unplug it every month or so as the factory system overrides it.
    why do you unplug it i never heard that it needed to be done ??,i have had mine in about 6 months

  10. Member
    Join Date
    Sep 2012
    Location
    Portland tennessee
    Posts
    898
    #10
    My sons 07 has afm and I can't wait for him to disable it. Sounds sick and can't be helping fuel mileage much.

  11. Member
    Join Date
    Mar 2016
    Location
    NC
    Posts
    654
    #11
    I have a 2016 Silverado. I got a Diablo predator 2, turned off afm and made the transmission shift faster. I love it

  12. Member
    Join Date
    Aug 2015
    Location
    Buggs Island So. VA
    Posts
    457
    #12
    I had one on my 13 and now on 16 since day 1. No loss of MPG and it eliminates any issue with AFM, oil consumption and associated issues. Would not run my truck without it.
    2023 Lund 2075 Pro V Bass XS
    2023 Mercury Pro XS 250 4S

  13. #13
    Quote Originally Posted by GMT View Post
    I had one on my 13 and now on 16 since day 1. No loss of MPG and it eliminates any issue with AFM, oil consumption and associated issues. Would not run my truck without it.

    The "AFM Oil Consumption and associated issues" have been taken care of as of 2015. The only remaining lingering complaint is that the 8 speed has a habit of downshifting hard or "holding" in a higher gear for a bit too long. Especially with grade braking engaged. I can't tell when mine shifts from 4 to 8 or 8 to 4. I have had -0- oil usage problems either. Mine is a 2016.

  14. Member
    Join Date
    Aug 2015
    Location
    Buggs Island So. VA
    Posts
    457
    #14
    Quote Originally Posted by Warpig556 View Post
    The "AFM Oil Consumption and associated issues" have been taken care of as of 2015. The only remaining lingering complaint is that the 8 speed has a habit of downshifting hard or "holding" in a higher gear for a bit too long. Especially with grade braking engaged. I can't tell when mine shifts from 4 to 8 or 8 to 4. I have had -0- oil usage problems either. Mine is a 2016.
    Not sure the problem has been completely resolved, although I hope it has been! Still reports of issues with the EcoTec 5.3, including lifters failing. May be isolated, but we haven't seen the mileage on these motors yet that we saw on the VorTec. I'll keep using it. I also put a catch can on day 1 as well. As important in my book for the new DI motors, others may disagree...
    2023 Lund 2075 Pro V Bass XS
    2023 Mercury Pro XS 250 4S

  15. Member ifishinxs's Avatar
    Join Date
    Jul 2015
    Location
    Southern Utah
    Posts
    6,403
    #15
    Quote Originally Posted by Warpig556 View Post
    The "AFM Oil Consumption and associated issues" have been taken care of as of 2015. The only remaining lingering complaint is that the 8 speed has a habit of downshifting hard or "holding" in a higher gear for a bit too long. Especially with grade braking engaged. I can't tell when mine shifts from 4 to 8 or 8 to 4. I have had -0- oil usage problems either. Mine is a 2016.
    Just to piggy back your response.
    2014 model year was the all new 5.3. No oil consumption issues. AFM is a Non issue as well. The 07 thru 13 had oil consumption issues. The Range was designed to eliminate the AFM on those model years to fix the oil consumption problem.
    2024 Phoenix 818, Mercury 175 (3B414035) Trick Steps, 3 Garmin 106 SV,s, LVS 34. BoatEFX dual bow mount. Ionic 12V 125AH, 2 12V 100 ah LiTime’s for the TM. Minn Kota 345 PCL charger,

  16. Member
    Join Date
    Aug 2016
    Location
    Colbert co. Alabama
    Posts
    3,441
    #16
    Quote Originally Posted by ifishinxs View Post
    Just to piggy back your response.
    2014 model year was the all new 5.3. No oil consumption issues. AFM is a Non issue as well. The 07 thru 13 had oil consumption issues. The Range was designed to eliminate the AFM on those model years to fix the oil consumption problem.
    This is correct. I had a 2015 and now have a 2017. You will not know in either when they went from 4 to 8 cylinder. I had a 2010 that had the oil consumption problem starting at around 60,000 miles. IMO and my experience the AFM system starting with the 2014 model works flawlessly.

  17. Member
    Join Date
    Jul 2006
    Location
    bixby
    Posts
    31
    #17
    Like Renegade said, if your truck has the manual shift option, and most late model trucks do, use the M5 mode. When putting the truck into gear, go all the way to the M setting. On the shift handle, select gear 5. When it is set to M5 it locks out the V4 and stays in V8 mode all the time. If your highway traveling and reach enough RPM it will automatically shift into 6th gear. Not sure about the 8 speed trucks but you can sheck it and see if it works.

  18. Member
    Join Date
    Sep 2010
    Location
    Burlington,Ia
    Posts
    190
    #18
    Quote Originally Posted by ifishinxs View Post
    Just to piggy back your response.
    2014 model year was the all new 5.3. No oil consumption issues. AFM is a Non issue as well. The 07 thru 13 had oil consumption issues. The Range was designed to eliminate the AFM on those model years to fix the oil consumption problem.
    I have one on my 14 GMC and also love it. I do also have to unplug it every 30 days or so. No oil issues. Hated the sound of my duels when it kicked down to 4 cylinders.

  19. Banned
    Join Date
    Nov 2013
    Location
    Wisconsin
    Posts
    812
    #19
    I have one. It works. I burn no oil anymore. The computer does override it every 30 days. 2011 Silverado

  20. Member bassman6805's Avatar
    Join Date
    Feb 2006
    Location
    Kentucky
    Posts
    1,128
    #20
    Quote Originally Posted by Brent11 View Post
    I have one. It works. I burn no oil anymore. The computer does override it every 30 days. 2011 Silverado

    Might I ask which one you have and where you got it? I have a 2011 and it started burning oil pretty bad. I don't drive it everyday now but would still like to get one and see if it helps.

Page 1 of 2 12 LastLast