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2015 Silverado Active Fuel Management....

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2015 Silverado Active Fuel Management....

Old 03-07-2017, 08:49 AM
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Default 2015 Silverado Active Fuel Management....

So what's everyone doing with this AFM on the V8 engines...

When I go from V4 to V8 I get a hell of a vibration of sorts... at first thought my tranny was going actually.

I can't stand it for the little fuel it saves and I can't imagine it's healthy for a motor to keep disengaging as there is bound to be unburnt fuel remaining... right??

Anyways are people de-activating it?

Can the dealer tweak it to engage LESS often... Driving around town at 35-40 is really annoying. The loss of power is driving me crazy.
Old 03-07-2017, 09:04 AM
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I have a 2016 Silverado with about 4000 miles on it now. I never really noticed any change in the engine sounds till this past trip I took to VA. I started noticing a change on the sound of the engine, so I switched the dashboard view to real time fuel usage. I then noticed the engine sound changed when switched to V4 mode. No difference in performance, vibration or whatever, just a difference in the tone of the engine. Sort of like a diesel with a Jake brake, but very, very mild. I was towing a boat, and using the trans tow mode.
Old 03-07-2017, 09:11 AM
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You can buy a device that you plug into the OBDII port that will deactivate the AFM.....BUT if you are still under warranty (which I imagine a 2015 would be) then you may be playing with fire. Obviously you could pull it out/off anytime you went to the dealer, but it's been said that the dealer can scan to see if any devises have been used in the OBDII port to deactivate certain things.....ultimately voiding the warranty.

I believe there was a post on another thread by a GM service manager who claimed that to be true. If it's just a slight annoyance, then maybe you just have to get used to it. When AFM was originally put on the 5.3, it was causing oil consumption and lifter issues, sometimes leading to all pistons and lifters being replaced under warranty. I haven't heard of that extending to the 2015 and later models though, at least not yet.
Old 03-07-2017, 09:12 AM
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I have a 09, one of the ones that has the AFM excessive oil consumption issues. Heard they worked those out so yours should be good but I hate the AFM as well. You can get a tuner installed that will basically kill the AFM because the tuner will then take control and not allow the AFM to run.
Old 03-07-2017, 09:19 AM
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Originally Posted by Southbay View Post

I believe there was a post on another thread by a GM service manager who claimed that to be true. .
That is correct.

Sadly there is not much you can do about it and no the dealer can not adjust it. Once out of your 3yr 36k you can get the program for it but out side of shimming a mount for the vibration you are kind of stuck with it and how it performs currently.
Old 03-07-2017, 10:18 AM
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On my 2011, if you put the transmission in manual mode and put it in 5th gear, it disengages the AFM. You lose the benefit of 6th gear (overdrive) but you get rid of the vibration/hesitation. I drive it in 5th around town but put it back on D for highway driving.
Old 03-07-2017, 10:22 AM
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with My 2015 high country, I do not notice it shifting too much but I still do not like the lose of power .. locally I drive in m5. that keeps it out of v4. on the road I plug in a Range device . problem solved
Old 03-07-2017, 12:37 PM
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Google range technologies. I have a 2010 with exhaust and I hated the way it sounded when it dropped to V4. You just plug it in under the dash and it stays V8 all the time. It was $200 well spent for me. You can unplug it whenever you want. Just plug n play.
Old 03-07-2017, 12:40 PM
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i notice the same thing on my 2014 silverado. When it goes into V4 mode, it feels like the engine is misfiring, running on dirty fuel, getting ready to die. Annoying, but not the end of the world for me. I would just prefer it to be smooth.
Old 03-07-2017, 12:43 PM
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Originally Posted by fireisland1 View Post
with My 2015 high country, I do not notice it shifting too much but I still do not like the lose of power .. locally I drive in m5. that keeps it out of v4. on the road I plug in a Range device . problem solved
What is a "Range Device?"
Old 03-07-2017, 01:23 PM
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Originally Posted by Nate5.0 View Post
That is correct.

Sadly there is not much you can do about it and no the dealer can not adjust it. Once out of your 3yr 36k you can get the program for it but out side of shimming a mount for the vibration you are kind of stuck with it and how it performs currently.
I doubt they will check unless your engine blows and they are looking for how to get out of replacing it. They can only void the warranty for things that could be caused by the modification so they could make the argument for engine internals failing (although it would be BS) but not if your alternator/water pump/window switch broke.

Personally I'd take the risk, how many times do you hear of engine internals failing in the first 36k miles. It is likely unknown if they have fixed the oil starvation issues on the newer models as there is not a large enough sample size with that many miles yet to know. I'd do it as a precaution.
Old 03-07-2017, 01:39 PM
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I bought a Range device and a ribbon extender cable with an on/off switch that is the perfect length, on top of my steering wheel, both via Amazon Prime. The Range plugs into the diagnostics port right under the dash, left side of the steering wheel. If you leave it on for days, it will drain your battery which is why I use the on/off switch. I have seen absolutely no change in fuel economy with the Range, which keeps your motor in V8 mode. As soon as you remove the Range device (like when going in for service), your engine reverts to AFM. Both Range and cable together cost less than $200. Google "Range AFM device 2015 Chevrolet Silverado." There are blue lights on the end of the unit that tell you it is working. Flip it on prior to starting your motor and off after you turn off the ignition.

Last edited by JimRockfish1; 03-07-2017 at 01:49 PM.
Old 03-07-2017, 02:00 PM
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I have a 2014 and had it turned off under warranty about 65,000 miles ago. Don't get turned off by the warranty talk. There is no harm in turning off AFM, other than maybe a little worse fuel mileage.
Old 03-07-2017, 05:52 PM
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Drive it in M5, at least in town. AFM won't work.
Old 03-07-2017, 06:02 PM
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I seriously hope my 2004 Suburban (pre-AFM) is the last tow vehicle I need to buy.
Old 03-07-2017, 07:46 PM
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I hated the AFM so much I traded it in. It is sometimes downright dangerous, esp if you do a low speed turn and try and merge into traffic. Hated it so much, it made the truck miserable.
Old 03-08-2017, 05:18 AM
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Originally Posted by Lima Bravo View Post
What is a "Range Device?"
Google search "Range Technologies".
Old 03-08-2017, 06:09 AM
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most reports are claiming that turning off the fuel management most folks actually saw an increase in fuel economy. that was my original plan, how ever i sold that POS before i could. if i were the OP i would put a tuner on it and let it ride. our local dealer was fine with having a tuner on it when i asked about it.
Old 03-08-2017, 06:11 AM
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GM should add an on off switch so the driver/owner can choose if he wants it or not. so far my 07 never had any better fuel econo than my pre AFM 1500, so basically it has done nothing other than cause them to loose customers, me being one of them
Old 03-08-2017, 06:34 AM
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...is garbage.

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