DFM module for 2026

[lost1wing]

The Ranger DFM module will be my first mod on my Tahoe.

 

[fondupot]

Great, it's a fantastic mod. As long as you know it only disables the electronics of the DFM and Auto Start/Stop system. The Mechanical components are still there, i.e. collapsible lifters.

Frequent oil changes with a high quality oil changes are the best way to extend the longevity of the motor with all the unnecessary mechanical components of the DFM system. Most users here will recommend 3000-5000 mile oil change intervals, and also to ignore the OLM % that the dash shows. The OLM% on the dash under normal conditions will extend oil changes out to 7500-10000 miles. Which is WAY to long for these engines. They like fresh oil, which is why most will recommend that 3000-5000 mile interval.

I have had the Range module installed on my 2021 since I purchased it in Fall 2024. It's been flawless.


This video should help you get it installed.

 

[malba2366]

Great, it's a fantastic mod. As long as you know it only disables the electronics of the DFM and Auto Start/Stop system. The Mechanical components are still there, i.e. collapsible lifters.

Frequent oil changes with a high quality oil changes are the best way to extend the longevity of the motor with all the unnecessary mechanical components of the DFM system. Most users here will recommend 3000-5000 mile oil change intervals, and also to ignore the OLM % that the dash shows. The OLM% on the dash under normal conditions will extend oil changes out to 7500-10000 miles. Which is WAY to long for these engines. They like fresh oil, which is why most will recommend that 3000-5000 mile interval.

I have had the Range module installed on my 2021 since I purchased it in Fall 2024. It's been flawless.


This video should help you get it installed.

Also use 0W40 oil instead of 0W20

 

[lost1wing]

It came in yesterday. I will get around to installing on Saturday.

 

[lost1wing]

Great, it's a fantastic mod. As long as you know it only disables the electronics of the DFM and Auto Start/Stop system. The Mechanical components are still there, i.e. collapsible lifters.

Frequent oil changes with a high quality oil changes are the best way to extend the longevity of the motor with all the unnecessary mechanical components of the DFM system. Most users here will recommend 3000-5000 mile oil change intervals, and also to ignore the OLM % that the dash shows. The OLM% on the dash under normal conditions will extend oil changes out to 7500-10000 miles. Which is WAY to long for these engines. They like fresh oil, which is why most will recommend that 3000-5000 mile interval.

I have had the Range module installed on my 2021 since I purchased it in Fall 2024. It's been flawless.


This video should help you get it installed.

I saw a disassembly video of a failed 2021 6.2l with very low miles, almost new. The metal and dark oil in the pan was unbelievable. The crank main and rod bearings were heavily worn with debris damage. I hope the problem was solved for my 2026.

 

[Sgt1411]

Ordered one today based on this thread and that video!

 

[lost1wing]

Well, I found some free time at lunch. I have installed the Range module. I took it for a short ride. No issues and all of my settings were still set.

 

[UAEdunes]

Is there any alternative to the Range RA007? Or this is the only one?

 

[KMeloney]

I saw a disassembly video of a failed 2021 6.2l with very low miles, almost new. The metal and dark oil in the pan was unbelievable. The crank main and rod bearings were heavily worn with debris damage. I hope the problem was solved for my 2026.

It sounds like you're new to the 6.2-woes party. These videos have been out for a while now, and there's no consensus that the problems have been "solved" beyond the '24s. So, just be vigilant. Congrats on the new truck.

 

[sohanrd]

Installed the RA007 on the new Tahoe 2025. Cant hear a difference with the stock exhaust. Since the car is new and havent driven without the 007 much, cant feel a difference. Any proper way to check it?

I have OBDLink MX+, but not sure where to check. Doesnt show any cylinder activation stuff.

 

[fondupot]

Installed the RA007 on the new Tahoe 2025. Cant hear a difference with the stock exhaust. Since the car is new and havent driven without the 007 much, cant feel a difference. Any proper way to check it?

I have OBDLink MX+, but not sure where to check. Doesnt show any cylinder activation stuff.

No real obvious way to tell that it's working. If you have a trained ear you could tell the difference of exhaust note when it would engage DFM (prior to module) and the module also defeats Auto Start/Stop, so if you haven't had any engine shut offs at stop lights/signs, then the module is working as designed. I have a scan tool that lets me see DFM data and I did some tests with the module on and off the truck. With the Range installed, DFM never engages, with it off, DFM engages...A LOT.

Read up on it in this thread, post #365

DFM disabler released

jfoj, appreciate your insight and my first thought was also battery or low voltage issue, but it was towed to the dealer and I have to assume they checked the charging system and battery as it was showing the same codes while in service and being diagnosed. Once they saw the module on the ECM...

www.tahoeyukonforum.com

 

[JayceeP]

So anyone with one of these range modules installed since new not have issues with their 6.2? Anyone install one of these and still have their 6.2 engine fail? Just curious how viable of a solution this is.

Do these modules void warranty?
Do the 3-5k oil change intervals make a difference?

Be curious to know success rate on 6.2 owners following these steps having/not having their engine blow lol.

 

[KMeloney]

I’m interested in hearing some answers to your questions, but I’m not sure what you’ll really be able to take from them, since there doesn’t appear to be a mileage milestone after which you can say you’re “in the clear.” If no one with a module has had his engine fail, but there’s such a small number of people using these modules vs people not using them whose engines have also not failed, I don’t know what that will prove. At very least, I think it’s too early to tell whether the module wards off engine failure.

Now, if some have had failures while using the module, then that certainly doesn’t bode well for the module.

 

[Sgt1411]

I installed mine (Range Technology DFM Disabler) today on my 25 Tahoe High Country 6.2L

Leaving wheel on but turning outward gives you room but I had 5 mini HEX trim screws to get out and then one bolt underneath. Its hard to get access to that module and detaching the OEM harness because fully extended you cant get much leverage. Taking wheel off would make it way easier.

One PRO TIP for those with the Advanced Security Package, when you disconnect NEG lead on main battery it sets off the piercing siren thats attached to the secondary battery thats hidden to power the Advanced Security Features. Scared the living Sh#! out of me and you cant disconnect that I know of.

I think truck runs better but could be placebo affect only time will tell.

 

[tagexpcom]

One PRO TIP for those with the Advanced Security Package, when you disconnect NEG lead on main battery it sets off the piercing siren thats attached to the secondary battery thats hidden to power the Advanced Security Features. Scared the living Sh#! out of me and you cant disconnect that I know of.

My 21 Yukon Denali does this as well - as I discovered when I put in a new battery! YIKES it's loud.
I 'think' I was able use the Fob to stop it? Not sure if that worked or it ran down on it's own

 

[Sgt1411]

My 21 Yukon Denali does this as well - as I discovered when I put in a new battery! YIKES it's loud.
I 'think' I was able use the Fob to stop it? Not sure if that worked or it ran down on it's own

Trust me I tried every button on the fob....NO JOY!

 

[fondupot]

So anyone with one of these range modules installed since new not have issues with their 6.2? Anyone install one of these and still have their 6.2 engine fail? Just curious how viable of a solution this is.

Do these modules void warranty?
Do the 3-5k oil change intervals make a difference?

Be curious to know success rate on 6.2 owners following these steps having/not having their engine blow lol.

Using the Range DFM module is not 100% proven to prevent engine failure from collapsed lifters, but it does keep the lifters from collapsing during normal operation. That said, they are mechanical components that can fail at anytime.

However, there are reports that the DFM module can stave off oil consumption issues. Meaning if your engine is consuming oil before the module, after it's installed, it has lowered the oil consumption.

Rule of thumb with these vehicles is 3,000-5,000 mile oil change intervals with a high quality synthetic oil. Ignore the Oil Life Monitor % (OLM). The OLM is most cases will suggest oil change intervals up to 7500-8000 miles. Which is way too long.

The Range Module, doesn't necessarily void any warranty, unless it can be proven to be the cause of a warranty related repair. Much like any other vehicle modification. But chances are it will depend on your dealer and the relationship you have with them.

Good luck.

 

[Kevz1088]

I was pretty religious about keeping my '21 Tahoe in L9 mode until the Range disabler finally came out in 2024. Once installed, it made driving so much more convenient with not having to get into L9.

I had 22" wheels on my '21 and was still able to turn the wheel all the way to the left, pull back on the wheel liner, and get the module installed without removing anything. It wasn't easy, but it's 100% doable. I would also forget to unhook the battery too from time to time, and with the exception of it making me roll down the windows a few times and the horn going off for a few seconds, there were no other side effects.

I pulled the module off every time I brought the Tahoe in for service and no one at the dealer ever mentioned it.

At 79k issue-free miles (and with doing oil changes based on what the computer oil life system dictated...not every 3k..and with no observed oil burning), I just traded in my '21 for a '26. I reached out to Range, and they asked me to send in my module so they could upload a software update for the '26 (probably because my module was one of the originals). I'm patiently waiting its return to install it on my '26 because I am a big believer in it. Not to mention, the engine/exhaust system sounds way better in constant V8 mode!!

On the other hand, I manage a good size fleet of Tahoe PPVs from 2020-2025. None of them are equipped with the Auto Start/Stop, but they're all equipped with the DFM. Each one has had lifter and/or pushrod failure and we add about a quart of oil in each one for about every thousand miles driven. With that said, I've proposed buying the Range disabler based on my personal success story, but my town has unfortunately declined my request. These negative work experiences further my belief in the Range module!!

 

[BacDoc]

Good to hear of your success with Range!
I have been using the Carbyte plugin for full time V8 and no stop/stop.
My 2024 Tahoe doesn’t use any oil between oil changes and I am not sure if the Carbyte has anything to do with that but I can’t see how any oil use between oil changes is normal for any new truck!

 

[ReaperHWK]

After some reading I’m going to buy this for my 2026 6.2.

Range website has them for $255 I was able to find it on Amazon for $230 and also 6% cash back with Amazon card. So $216 after the rebate. That’s the best deal I found on it.

Anything better?