Range Technology Offers AFM/DFM Disabler For General Motors Vehicles
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Automotive electronics company Range Technology has released its new Active Fuel Management/Dynamic Fuel Management disabler for General Motors vehicles.
The AFM/DFM disabler is a plug-in module that deactivates the AFM and DFM systems in V6- and V8-powered GM vehicles. The module simply plugs into the vehicle’s OBD-II port, making it easily reversible and ensuring it does not void the vehicle’s warranty.
Range Technology says its disabler will prevent the “shuddering” that some customers experience as AFM/DFM vehicles switch between running on half or all cylinders.” The company also says the module can save the owner money on “costly future repairs,” as GM’s “troublesome valve lifters will no longer be tasked with activating and deactivating constantly.”
General Motors’ DFM technology, also known as Dynamic Skip Fire, saves fuel by only using the cylinders of an engine that are required during the specific driving situation. If a V6 or V8 engine is just cruising down the highway, for example, it will activate DFM. When towing, accelerating or performing other strenuous tasks, the DFM system will remain off, giving the driver full engine power.
DFM is the more advanced successor to AFM. Whereas AFM would flip between four and eight-cylinder mode, DFM shuts down certain cylinders based on the driving scenario. An engine with DFM has 17 different cylinder configurations and will flip between them to deliver an optimal balance between performance and fuel economy.
Range Technology’s plug-in disabler works with older General Motors vehicles that still have AFM and new ones that use DFM. It will work with all GM vehicles with a V6 or V8 engine with AFM or DFM, including cars, SUVs and the popular Chevrolet Silverado and GMC Sierra pickup trucks. Prices start at $189.00 USD.
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Hello All, So it has been a week with the Range Technology on my 2016 Yukon Denali. I have to say it works pretty good. Shifts are way smoother….at least I think they are. I did have the clunk shift from 1-2 a few times but have not since. I also do not feel or notice the shudder issue as well. I will give it some more time but I am happy so far. Worth the $200 I spent so far.
Lenny
i have 2021 silverado 1500 ltz 6.2 10 speed i have read alot abound ranger ra003b i look it up on summit web site they said
it was not compatabe with 2021 help thanks
2017 Yukon 5.3l, 70000 kilometres AFM lifters failed. Proper oil changes all done dealer. Daily commuter and 2 cross country trips, Warranty repair but will never trust it again. Will trade before warranty up for something without DOD AFM or DFM. Loyal GM customer for many years but will look elsewhere for next vehicle.
What exactly was it doing?
On a morning commute the check engine light starts flashing indicating misfire. Once scanned it shows random misfires. Dropped at dealer and informed in a few hours AFM lifter failure. Long wait on parts but will be covered under warranty.
2021 GMC Yukon XL – 4658 Mileage – Colorado
Engine started to knocking at Sep 3. Service appointment was on Sep 17, pickup Sep 23:
Parts: $2321.80, Labor: $1650.34. Total: $3972.14 (Actually all restored by warranty)
Found missfire on #7 cyl
Found bent push rod – removed intake, both valve covers, both exhaust manifolds, push rods.
Removed both cylinder heads, all lifters and guides. Replaced all lifters and guides.
Replaced all lifters and guides.
Installed cylinder heads, push rods, valve cover
Intake and exhaust manifolds. Topped off coolant and oil.
Test drive all ok
My 2021 YukonXL had the same issue. Once repaired and replaced it did it again. We had it declared a lemon after it was in repair for more than 30 days. GM had to refund all money from purchase. Did not buy another one as I personally know other people with the same car that had the same issue. They keep selling them but clearly do not fix the issue.
I have a 2021 Chevy LTZ with 6.2L and 10 speed. When coming to a stop nearly every time my truck makes this chirping sound. No noise when in L7, L8 and L9 which bypasses DFM (so I’ve read) I’ve heard DFM is the culprit for these noises and I’m considering the Range module. Any else encounter these noises?
My 2015 silverado with the 5.3 just had lifter failure at 58k miles. Ive been running the Range Module for over 12k miles. So; NO, the range will not protect you from ” costly future repairs”.
That being said my truck is lifted with bigger tires. I did experience better gas mileage when cruising at around 55mph or 1500rpms. I wouldn’t expect any difference on a stock truck; but with pushing more weight at the wheels, I think the range preventing my truck turning into a V4, made a big difference as far as that goes.
But do not expect your lifters to live forever (which is what I thought when I bought the Range.)
18 yukon 5.3. Spent month in and out of shop for precived transmission issue. Come to find out it was afm causing the shift problems going from 8 to 4. First was adding archoil oil to the oil, that a whole mother story. Short is if you read and understand how the vlom works and compare this to sticition issues in diesels injectors then you figure it out. 2nd added the range device. Using range and archoil oil additive I’ve never has a mother issue in 40k miles I lost maybe 1 mpg.