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Started By
Message
AFM/DFM disablers; what are you using?
Posted on 1/28/26 at 9:00 am
Posted on 1/28/26 at 9:00 am
Definitely thinking about installing one and need some thought other than my own.
Looking at Range Technology DFM Module GM Refresh Part # RA007.
TIA
Looking at Range Technology DFM Module GM Refresh Part # RA007.
TIA
6
Posted on 1/28/26 at 11:12 am to Wtodd
I have that exact one and it is working fine. Actually bought it used. I heard the cheaper ones work well also. Using it on a Yukon.
Posted on 1/28/26 at 11:27 am to Wtodd
I’ve had a Range technology for 6 years and it’s been great.
Posted on 1/28/26 at 4:57 pm to sloopy
Active Fuel Management AFM/DFM Disable Device, Compatible with GM V8 V6 Engine
$40 from Amazon...works great...
$40 from Amazon...works great...
Posted on 1/28/26 at 7:02 pm to Wtodd
If you're spending the $ why not get a custom tune to disable it?
Or put an actual tuner on so you can monitor, tweak etc. Will disable AFM, and get some better mpg and power if you can keep your foot out.
Or put an actual tuner on so you can monitor, tweak etc. Will disable AFM, and get some better mpg and power if you can keep your foot out.
Posted on 1/29/26 at 9:50 am to TFLEX
The only issue with doing this is my truck is under warranty and we all know they look for anything they can to tell you you voided the warranty. With the DFM disabler, I unplug it and no harm no foul.
Appreciate the comments.
Appreciate the comments.
This post was edited on 1/29/26 at 9:51 am
Posted on 1/29/26 at 2:39 pm to Wtodd
Well- if its under warranty I'd leave it alone.
Realistically is it an issue? Yes. But the internet makes it seem so much worse than it is. Source- friend who has worked for GM for 30 plus years in Michigan.
These motors the biggest thing- is maintenance. If you do all of your oil changes, etc on time, and use quality synthetic. It really lessens the chances. My 6.2 went 200k before it dropped a valve seat- now- deleted everything, tuned, no cats, upgraded cam. It is a monster.
Realistically is it an issue? Yes. But the internet makes it seem so much worse than it is. Source- friend who has worked for GM for 30 plus years in Michigan.
These motors the biggest thing- is maintenance. If you do all of your oil changes, etc on time, and use quality synthetic. It really lessens the chances. My 6.2 went 200k before it dropped a valve seat- now- deleted everything, tuned, no cats, upgraded cam. It is a monster.
Posted on 1/30/26 at 5:09 am to TFLEX
quote:
Well- if its under warranty I'd leave it alone.
Yeah that's one thought BUT if it's truly an issue then I'd like to eliminate the issue so it never rears its ugly head.
quote:
But the internet makes it seem so much worse than it is.
Probably
Posted on 2/4/26 at 9:26 am to Wtodd
OK decided to just use the L9 hack at least for the time being.
Posted on 2/4/26 at 10:29 am to TFLEX
quote:
These motors the biggest thing- is maintenance. If you do all of your oil changes, etc on time, and use quality synthetic. It really lessens the chances
This. Neither of my 5.3 engines had any issues over 200K miles. I looked at disabling AFM but decided it was likely best to leave it alone.
I think the concern is overblown and money should be saved for the eventual transmission replacement
Posted on 2/4/26 at 11:58 am to Theduckhunter
100% agree. I've talked to a bunch of people about it last several years. Trans going bye bye is another issue haha.
Posted on 2/4/26 at 2:01 pm to Wtodd
.
This post was edited on 2/4/26 at 2:02 pm
Posted on 2/4/26 at 5:21 pm to TFLEX
Tell that to my brand new 1500 with less than 20k miles that dropped an entire row of cylinders due to deactivation while doing 55 mph. Oil changed every 5k miles and never beaten on.
It's been 3 months and I still don't have a truck.
It's been 3 months and I still don't have a truck.
Posted on 2/5/26 at 9:14 am to BadatBourre
What year is it? The trucks I'm talking about are 2007-2018 ish- all though the 8 speed is another animal full of its own gremlins. Their are a lot of changes since 2019- the newer ones are a completely different animal.
They changed tolerance, specs, etc. Switched to thinner oil, trying to squeeze out more mpg from them.
The results have been catastrophic. Dealers literally won't even sell the new 6.2 trucks.
They changed tolerance, specs, etc. Switched to thinner oil, trying to squeeze out more mpg from them.
The results have been catastrophic. Dealers literally won't even sell the new 6.2 trucks.
Posted on 2/5/26 at 10:25 am to TFLEX
quote:
Switched to thinner oil
Yeah, my 2021 is used but when I went to change the oil and saw they switch to 0w-20, I just used 5w-30. I figure it’s worked for the last two just fine, and GM started recommending higher vis oil for the 6.2 when they issued their recall.
Posted on 2/5/26 at 12:50 pm to Theduckhunter
Yep. Buddy at GM recommends the same.
Full rebuild and delete is different than AFM disable for longevity.
Now- after driving my built 6.2- my future plan is a 10 speed Yukon XL with the 6.2. And I'll have the same guy do my motor, delete AFM and VVT, upgrade cam, delete cats, custom tune.
Full rebuild and delete is different than AFM disable for longevity.
Now- after driving my built 6.2- my future plan is a 10 speed Yukon XL with the 6.2. And I'll have the same guy do my motor, delete AFM and VVT, upgrade cam, delete cats, custom tune.
Posted on 2/6/26 at 9:13 am to Wtodd
Tried the Range dongle recently, city driving mpg dropped by almost half to 10-12 mpg. Engine seemed to run too rich at morning startup. What got me thinking is the solenoids that control the AFM system use engine oil as hydraulic fluid. If not activated for a long period they may fail. Damned if you do, damned if you don’t.
I’ve always done the severe service maintenance schedule, removed the Range and am rolling the dice. 2016 Sierra with only 40k miles bought new, my lightly used fishing truck, partner always wants to take his Tacoma.
I’ve seen people have good results with the Range and other devices but the sure cure is a complete delete. Expensive. Rumor is GMC is removing AFM on new engines going forward. If that happens I’ll get a new one.
I’ve always done the severe service maintenance schedule, removed the Range and am rolling the dice. 2016 Sierra with only 40k miles bought new, my lightly used fishing truck, partner always wants to take his Tacoma.
I’ve seen people have good results with the Range and other devices but the sure cure is a complete delete. Expensive. Rumor is GMC is removing AFM on new engines going forward. If that happens I’ll get a new one.
Posted on 2/6/26 at 9:30 am to TFLEX
quote:
These motors the biggest thing- is maintenance. If you do all of your oil changes, etc on time, and use quality synthetic. It really lessens the chances. My 6.2 went 200k before it dropped a valve seat- now- deleted everything, tuned, no cats, upgraded cam. It is a monster.
a gm mechanic told me the most failures that they see on the 6.2 is immediately after an oil change
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