Works as described, only problem is the cover came off first time i removed the device from port. Did not affect operation of control so far works well.

I have a 2010 GMC Sierra 1500 5.3L V8 flex fuel engine that I purchased around April or May of this year and in driving it around I noticed at times that it just did not feel like it had the power that a V8 should and after having 3 V8 trucks prior to this one I know what it feels like to drive a V8 and for some reason this truck just seemed to lag whenever I accelerated or I can feel it lagging when it was shifting or whenever I had to turn onto a highway that was a speed limit of 70 mph and I'm at a dead stop and I'm turning on to it hitting the gas I am expecting a 5.3 l V8 engine to be seamless shifting from one gear to the next and for my RPMs to jump and for that engine to accelerate like it should, but for some reason it just felt like there was some hesitation, so was this in my head? Well so I thought or what else could it be? Besides that the truck has been a tank and never giving me the least bit of trouble, but I would be lying to say that this did not bother me because I just felt like I was not getting the full V8 performance for some reason or another. So long story short one day I was just messing around with the buttons while I was driving going through my mileage and miles per gallon and all that stuff that is located on your dash when you hit the buttons and then I came to one where it was showing my average miles per gallon and it also showed Inst. Economy V8 above would change to V4 and back to V8 And it would do this constantly while I was driving for no inexplicable reason and it felt like my truck was had going through an identity crisis and he couldn't tell whether or not it was a V8 or a V4 so upon recognizing this I immediately started doing research and reading and reading and reading and that's when I came to find out about the active fuel management system and how useless it really is... I'm not buying a 5.3 l V8 truck because I'm worried about the miles per gallon that I'm getting, I'm getting a V8 truck because of its versatility and it's power and it's durability and just logically thinking to myself this cannot be good that it is shutting off four of my cylinders and then turning them back on and doing this constantly day in and day out when I'm driving the vehicle and there's nothing that I can do about it... Except for replacing the whole camshaft in the lifters and a lot of other major parts which would end up being around 5 grand if I was lucky, so it hadn't caused me any problems as of yet and I was reading my GM manual that came with my vehicle and that's when I learned that the only way to stop this was to drive it in manual mode and so I did that just to test it for about 3 weeks or so. So basically whenever I would get in my vehicle and go to put it in drive instead I would put it in manual which is the M and the plus minus buttons on your shifter is basically for shifting gears and then I learned I could go up to 5th gear and it would stay in V8 mode the whole time but if I decided to go up into 6th gear then it would for some reason kick the AFM system back on, so I drove it around in fifth gear for about 3 weeks just to see how much gas I was losing allegedly.. well I basically wasn't losing any And if anything I actually gained more miles per gallon and that's when I decided to do some more researching to see if there was any other way that I could disable this ridiculous stupid idea that some idiot came up with to decide to put these in trucks or any GM vehicle with a V8 and some V6 engines as well I believe 4.2 l V6 engines because any engines smaller than that wouldn't be worth putting in AFM system and it because the fuel consumption isn't going to be quite as much, but like I said if you're buying a truck and you're like me and you get a 5.3 l V8 engine then you want to feel the power of that engine all the time and you want to be able to use it all the time or at least have control over it and they don't give you that option and that's when I came upon the AFM disabler and that's basically what it is and all it is and it is specifically made to disable the active fuel management system and that's it and that's all... So I figure hey if they are making these disablers then that must mean that these AFM systems are causing troubles in a lot of vehicles at some point or another and threw a lot of other research I learned that's exactly the case which ends up being high oil consumption and the lifters fail and this is extremely expensive to fix And so after looking at several different disablers because some are more expensive than others I decided to go ahead and get this one because it was about half the price as the Range AFM disabler And if that was my only option then I would have gotten that but thank God there was other options in this happened to be one of them so I decided to go ahead and give it a try And so as soon as I got it all I did was take it out plug it into my OBD2 port and it has been there for 3 months now and I have not removed it once and it has worked seamlessly and been everything that I thought it would have been, it has not disabled my cruise control or any other functions as others have mentioned and whatever's up with that I have no idea and whenever I'm driving and I come home and park my car or if I park my car anywhere once I turn it off and take out the key then the light goes off and there has been on occasion where I needed to run out to my truck and get something or whatever the case may be I put the key in the ignition and turned it on but may not have started the vehicle The light will come on and then I take the key out and the light will stay on so then I just turn the vehicle on and I wait a minute or two and then I turn it back off again in the light will go off and I just want to make sure that the light goes off because I don't want it to drain my battery and whether it will drain my battery or not I have no idea, but I don't want to find out, but like I said only under that circumstance did it stay on and the other 99.9% of the time when I'm driving it and I park it and I take the key out the blue light goes off And while I'm driving it I have kept the dash screen on the entire time to make sure that it never goes out of V8 mode and back into V4 mode and it never has it has stayed in V8 mode the entire time since I have put it in and finally I have the truck that I thought I was getting when I originally purchased it a true 5.3 l V8 engine that stays a V8 100% of the time so I would highly recommend this product to anyone out there who is having the same questions or thoughts that I had and you want to save yourself at least $100 I would definitely go with this front and I'm not one to leave many reviews unless I am extremely happy with a product and this happens to be one of those products because it is a world of difference with how my truck is performing and I can't tell a bit of difference with the gas mileage and if I have lost any miles per gallon then it isn't much and it's definitely not something I would be worried about or else I wouldn't have bought a V8 to begin with obviously... So I know this doesn't happen all the time but this product does exactly what it says it does it disables that stupid AFM system and I could guarantee it's going to save me having to spend thousands and thousands of dollars in the future in repairs And it still blows my mind that they're putting in these systems still in vehicles today, but now they say it's improved and now it's the dynamic fuel management system because it just doesn't shut down the same cylinders every time it shuts down different cylinders in different sequences, but it's all the same to me because it's still switching your V8 truck to a V4 depending on load management and you have absolutely no control over it so if it feels like only using 4 cylinders well then you're going to be driving around a 4 cylinder truck and now there's no more lagging and there's no more hesitation and the shifting between gears is seamless as it should be with a V8 engine and I'm loving every minute of it and I only wish I would have known about this or found out about this sooner... So if you were like me and this is aggravated and annoyed you and it feels like your truck doesn't quite have enough power well that's because it doesn't and I would definitely recommend this product and don't waste another minute and purchase this product and it will feel like you are driving an entirely new vehicle and your vehicle will love you for it

Wanted to add an aftermarket exhaust to my 2020 Silverado and needed to get rid of the annoying 4 cylinder sound. This did the trick.

Completely different truck. Amazingly enough I picked up over a mile to the gallon after installation. Also noticed that running in 8 all the time the truck doesn't down shift as much on the highway, increasing fuel mileage.

The only thing I don't like is that you lose cruise control with this. If that's a big deal then don't get it, but you will have a hard time finding something better at this price point. I would rather keep my V8 and save possible issues from the AFM, so it's worth it to me. As for any gas mileage changes, I cannot say because I installed this shortly after getting my vehicle. Mileage is not my primary concern; I needed a reliable vehicle to get everyone around. I can at least note that the gas mileage is consistent with reports I've read from other people who are in similar driving conditions.