Guaranteed Free Delivery by 12/24! available on most items - Details

Talk to a Sierra 1500 Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $4,000! Enter Daily

Diablosport inTune I3 Platinum Tuner (99-16 5.3L Sierra 1500)

Item S525128-53
Call a Sierra 1500 Enthusiast at 1-888-706-1096
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Our Price

$419.95 (each)

FREE Shipping Market Price $478.99 You Save 12% ($59.04)

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle
Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

      Video Review & Installation

      Jake: Jake here for AmericanTrucks, and today I'm taking a look at the Diablosport inTune I3 Platinum Tuner for 1999 to 2016 5.3-liter Sierra 1500s. This is going to appeal to the 5.3 Sierra owner who is looking for an all-inclusive, easy-to-install tuning kit that's going to give solid performance improvement with lots of flexibility and features. This setup features everything you need to get a tune on your truck with no fuss at a pretty reasonable price.Don't let the size fool you, this little module has a lot of firepower behind it. The inTune I3 Platinum Tuner comes preloaded with tunes that are all dyno-tested and street proven by Diablosport to ensure that you're going to see improved power and driveability without sacrifice. When you go to program in the tune, you're going to get asked a few questions regarding what octane fuel you plan to use, if you've changed the tire size versus your stock setup, etc.The module is going to give you tunes based on how you answer those questions. You can also do things like removing the speed limiter, disabling the electronic stability program, adjusting the rev limiter, disabling active fuel management if your truck is so equipped, controlling when your cooling fan kicks on, adjusting spark timing, air-fuel ratio, and even calibrating the speedometer to accommodate larger wheels and tires or a different gear ratio. And that's just kind of scratching the surface. The unit is also going to save your stock tune, so if you do need to revert back to OEM spec at any point, you can do that very easily just by plugging this in.Speaking of easy, this also has the ability to receive updates via Wi-Fi, or you can utilize the included USB cord and choose that from your Mac or Windows PC. But there's more. The unit also allows for data logging, so you can check on different engine parameters, see how everything is performing. You can download those logs onto your computer into Diablosports Data Viewer software to view and analyze all of the data. The tuner unit can also read and clear diagnostic trouble codes, so if you happen to get a check engine light, you can just use this to read the code, clear them right out of the engine computer and be on your way, save you a trip to the shop.Now it might be a little weird to talk about construction in a kind of handheld tuner unit, but I think it's worth mentioning here because the whole thing is controlled by a touchscreen and it has excellent screen resolution too. So it makes it very easy to use, easy to navigate, and it also looks good if you want to keep it up and use it as a display in the truck. Remember it can do data logging so you can see all that information live right there on your dashboard.Price-wise, this is going to run you about $475, and that's not pulling any punches. For what you're getting here, this is a good deal. The flexibility of the tuning module alone is great, but you also keep the ability to easily revert the truck back to stock by yourself. You can modify a bunch of different parameters on the truck, and with all the features and the ease of design and install and use, I really think you're getting an excellent value here.Speaking of install, this is going to get a one out of three on our difficulty meter and should only take you about 15 minutes to get it installed. This is really an easy plug and play operation. This plugs right into your OBD2 port, meaning that you're going to spend more time messing around with the system and getting things set up the way you want it than actually installing this. It's pretty simple, definitely something you can do at home in your own driveway. Not much more I can say about it right here. With that, let's go ahead and throw it over to one of our AT customers who's going to walk you through the process.Man: So the first thing you're going to want to do is you take your OBD2 port, your cord, and you're going to hook it right into your OBD2 port down here. And then she gets power from your vehicle. Now one thing you do want to make sure that you do is make sure that you have a full charge on your battery when you do this. So if you don't have a full charge or you're kind of worried about it, drive it around for 10, 15 minutes as the instruction says, just to make sure you have a good charge on your battery because you will have your key on with nothing running, the motor's not going to be running, your alternator's not going to be charging the battery and whatnot. So I just came back from my kids' football practice so she's well-charged.So the first thing that pops up, the Diablosport inTune is designed to increase vehicle performance and fuel economy. Never use the inTune during vehicle operations. So you obviously don't want to be monkeying around with this, no different than a cell phone. Don't be playing with this while you're trying to drive. If you agree to these terms, hit yes. So we're gonna go ahead and hit yes.Now I'm going to go into settings real quick. We're going to Advanced Options. Actually, I apologize, we're going to go back. We're going to hit Wi-Fi configuration, Wi-Fi setup. You need to have a Wi-Fi connection in order to check to see if there's any updates available. So you let it do its thing, it's thinking there for a little bit. I'm going to connect to my Wi-Fi so you can see a list of different Wi-Fi's that it's reading right now. All right, then it'll give you the please wait. Connection successful. Press yes to check for updates or no to return to Wi-Fi configuration. I'm going to go ahead and hit yes and see if there's any updates.Like I said, if you're not close enough to your Wi-Fi connection, and you don't get good connection, you can always take this. Use a regular square charger for your iPhone or your Samsung or whatever. You connect that and then you connect it right here to this port and it will give you power. That way you can download your updates. Oh, we got lucky. There's no updates available for this one. So this one's been updated, hasn't been sitting on the shelf for too long.So now we're going to go back and back again, now we wanna go tune vehicle. Before I get to that, so a couple other things right here, you have scan tool. This is also a scanner, so if you have one of your dummy lights come on, your check engine light, ABS light, whatever the case may be, you can go to scan tool, you can hit that, and it'll scan your vehicle for any codes. Now, it doesn't give you a description of what each code is, but it will give you the code, and all you have to do is hop up on the old Google interweb, type in that code and your vehicle, and it'll tell you exactly what that code is. You can also erase the codes or reset the codes as well.So I'm gonna hit "Tune Vehicle." Please ensure the key is in the run position. Do not start the engine. Now for some of you guys that might have push button start, I don't have my keys. If you have push button start, all you have to do is hit the start button once, without your foot on the brakes, you wanna start, you just hit it once and then you're in the run position. Okay? So I'm gonna go ahead and turn my key on. It is in on position and I'm gonna hit "Continue." Basically what it's doing is connecting to the ECU right now, making sure it can read everything and it's got a good solid connection with the vehicle.All right, so we have easy tune and advanced tunes. Okay? So if you hit easy tune, you have 93 octane tune, 91 octane tune, 87 octane tune, and then your miles per gallon boost. For me, I'm not a very wealthy man, I can't run 93 or 91 in my truck all the time with the amount of driving that I do. So I'm gonna do the 87 octane tune. So now it's going to ask you, do you want to do the 87 octane tune or the miles per gallon boost tune? I want to do the 87 octane tune. 87 octane tune, Diablosport 87 octane tune is designed to add power and torque, but with fuel economy in mind. Fuel mileage can always be subject to driving style and may vary from vehicle to vehicle. To use this tune you hit "Select."So basically what they're saying is, obviously if you have a heavy foot, you're not gonna get a whole lot better gas mileage, if any. Especially with doing the tune, you're gonna have increased throttle response, you are gonna bump up the torque and horsepower. So if you're somebody that gets really excited about that, obviously you're not gonna be saving too many miles per gallon. I'm gonna go ahead and hit yes. Press "Continue" and then select a transmission tune. Hit continue. And then we're going to do install standard tune.So you have transmission firm shift, transmission hard shift tune, modified stock tune, skip control unit. So we're going to do a trans firm. I want to do the trans firm shift tune. The trans firm shift tune is designed for a mild increase in shift feel. I'm going to go ahead and select that. I'm not gonna change my tire size because I have stock tires on here. So I'm gonna hit no. I have the same gears that came stock so I don't wanna change that either. I am going to go ahead and get rid of my speed limiter just in case I'm feeling a little frisky out on the dirt road. That was a joke by the way. I always obey the speed limit.I3 tune will now read and back up from the vehicle. Tap yes to continue or no to abort. I'm going to hit "Yes." It's going to make a bunch of different noises. You're going to hear beeps. It's beeping right now with me. It's showing my traction control's off. It's basically going through and doing its thing with the ECU. It's communicating with it. It's reading it. And then once it gets it and reads the ECU completely in the stock tune that comes from the factory, it will store that stock tune inside your Diablosport tuner. That way, if you ever decide, hey, I'm having issues or you want to bring it back to the garage because you've got a warranty on it, you can go ahead and install your stock tune.Now, they obviously can, and that should be a disclaimer, they can obviously hook up, your GM dealers, Ford dealers, stuff like that, they can hook up and see if you've tampered with any type of programs with the ECU. So whether or not that was the cause of the problem will determine if your warranty is going to be valid. So now it's exporting the file and it's backing up the ECM at 100% there. Now it's got your TCM, which is your Transmission Control Module. It's reading that. And it's going to store that same stock tune for the transmission control module as well. There you go. It's reading the TCM. And it's doing the original backup, saving the files from the original tune.Now, one thing I do want to reiterate is that you do not want to be turning the key on and off during this. You don't want to be touching anything. Just let it do its thing. Now it's backing up the TCM, exporting files, 87 octane with speed limiter removed, install this tune. We're gonna hit "Yes," because that's the tune I want. Apply select tune with tire size gear ratio and speed limiter as selected. Yes. Now while you guys are watching this, you guys are probably asking, you know, I thought you really wanted to get rid of the active fuel management tool or the active fuel management program in your vehicle. It does not come up and allow you to do that right then and there. You have to go to the advanced options and I will go over that one next because that is the big reason why I'm doing this. I wanted to get the longer part out of the way right now.So it's writing the tune now for the ECM. And it's very surprising at how quick this is loading. So that ECM writing tune is completed, now they're exporting the files. Like I said, don't be afraid if you start hearing noises, it's going to be doing a bunch of different things, running through a bunch of different protocols as far as getting rid of the old tune and installing the new tune. So it will make noises, it will beep at you, you'll have different indicator lights coming up on your dash. Just let it do its thing. Don't disconnect it or touch the keys while it's doing this because you could end up running into some issues as far as the program, the original software and stuff like that in your ECU in your vehicle.Now it's going to the TCM right now, it's writing that tune. Tune complete. You may unplug your tool and enjoy driving your vehicle or tap "Continue" to reboot. So I'm going to go ahead and tap on "Continue," I'm going to reboot and then we're going to go back in and I'm going to show you how to get rid of the active fuel management. She's rebooting now. It's going to go over the same exact thing telling you that not to use this while you're driving, hit "Yes," you agree to those terms And we're going to go ahead and go to tune vehicle. Continue. I'm gonna go to Advanced Tune.Now, if you do know what you're doing and you're very familiar with tuning, you can go through and do like a custom tune, you can adjust a lot of different things. I am not that savvy at all, so I'm not going to mess with that. I'm going to go to "Modify my parameters." It's gonna be ECM. And then we're going to do a scroll down here. There we go. "DOD AFM Calibration," go to that. Then it's gonna add, it's got your on and off, you're gonna hit that, and we're gonna hit "Off." Set AFM, your active fuel management, on/off to off. Yes.You hit back, back, and then you're going to go ahead and apply that tune. And then it's going to go through and do the active fuel management. It's going to rewrite the ECM active fuel management part. And we're going to go ahead and turn that off. So we have no more going down to four cylinders, that constant weird shift and that lag in power, and hopefully extend the life of the engine in this truck as I would like it at least to last for a couple more years. And just completed there.I go through the TCM real quick. Basically what it's doing is I guess what you could have done is you could have went into the active fuel management, applied that and then did the 87 octane tune as well. And that way it would have done it all at once, but I did it kind of backwards just in case you don't have active fuel management and you wanted to see how to just do the regular tune. I figured I'd do the regular tune first and then I'm going to go back through for anybody else that wants to get rid of the active fuel management and get rid of that as well. All right, tuning complete. You may unplug your tool and enjoy your driving. So I'm gonna go ahead and hit "Reboot" and I'll let that reboot.Once it turns off, I'll unplug it and we'll start it up. Make sure we have no check engine lights, no dummy lights coming on. Make sure that everything is good to go and then I'll start it up completely. I'll turn it off. Turn it back on.Jake: That's going to do it for our review and install of the Diablosport inTune I3 Platinum Tuner for 1999 to 2016 5.3-liter Sierra 1500s. Thanks so much for watching, and as always for all things Sierra, be sure to keep it right here at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Improves Horsepower, Torque and Overall Performance
      • Platinum Version - Supports Custom Tuning
      • Holds Up to 5 Custom Tunes - Available Separately
      • Pre-Loaded with Pre-Configured DiabloSport Tunes
      • High-Resolution Touch Screen Display
      • On Screen Data Logging and Monitoring
      • Reads/Clears DTC Trouble Codes
      • Updatable via Mac, Windows or Linux
      • Fits 1999-2016 5.3L GMC Sierra 1500 Models


      Increase Power and Performance. Further enhance the performance of your 1999-2016 GMC Sierra with inTune i3 Platinum Tuner. The inTune i3 Platinum Tuner supports third party custom tune files and also comes preloaded with Diablosport's very own pre-configured tune files. When your Sierra rolled off the assembly line, GMC programmed it to cater to the needs of the daily driver, not the performance enthusiast who adds aftermarket bolt-on modifications in the search of more power. So, if your Sierra is bone stock or if you have added a cold air intake, throttle body or exhaust mods, you should invest in a Diablosport inTune i3 Platinum Tuner to see the full power potential your Sierra can make.

      User Adjustable. DiabloSport designed their Tuner to be user adjustable. This means you can make further changes to the tune files to suit your particular performance needs. Please note that not all adjustments listed below are available on all vehicles.
      • Calibrate Speedometer for Gear Ratio
      • Calibrate Speedo for Tire Size
      • Cooling Fan Control
      • Disable ESP
      • Throttle Booster
      • Fuel Rich/Lean Adjustment
      • Spark Timing Advance/Retard
      • Idle RPM
      • Top Speed Limiter
      • Rev Limiter
      • Disable Active Fuel Management

      Built-in WiFi. The inTune i3 Tuner is WiFi-capable meaning you will no longer have to plug it into your Mac, Windows or Linux computer to receive the latest Diablosport firmware updates, but that is still an option. Once setup with your Wi-Fi password, the inTune i3 will download the latest firmware updates via the internet.

      Data Logging and Monitoring. With a full color, high-resolution touch screen display, the Diablosport inTune i3 Tuner makes it easy to read the Built-In Data Logging and/or the Real Time Data, so you can view popular sensor data such as EGT, Air/Fuel Ratio or any other 0-5 Volt source.

      Diagnostics Tool. The inTune i3 Tuner can also be used as a diagnostic code reader. Save yourself time and money by reading and clearing your own Diagnostic Trouble Codes (DTCs) rather than paying a dealer to do the same. It's as easy as a few simple steps.

      Easy to Load; Easy to Restore. When you load your DiabloSport tune on your Sierra, the tuner automatically stores your vehicle's factory settings. To return to the original factory settings, just plug the tuner back in, select the option to restore the factory settings, and you're done. This is ideal for visiting dealerships for warranty work.

      Application. This Diablosport inTune i3 Platinum Tuner fits 1999-2016 GMC Sierra models equipped with the 5.3L engine. This Tuner supports custom tune files which are available separately.



      Diablosport 8245

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) i3 Tuner
      • (1) OBD-II Cable
      • (1) USB to Mini-USB Cable
      • Quick Start Guide

      Customer Reviews (82)

        Questions & Answers

        10 More Questions

        Will It Fit My Sierra 1500

        • 5.3L V8 - 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14, 15, 16