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Curt MultiPro and Multi-Flex Tailgate Hitch Cap Sensor Installation - 2019 GMC Sierra 1500

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How to Install the Curt MultiPro and Multi-Flex Tailgate Hitch Cap Sensor on a 2019 GMC Sierra 1500


Hey, everybody. How's it going Today, we're gonna be going over and showing you how to install the CURT protective MultiPro and Multi-Flex tailgate sensor here on our 2019 GMC Sierra 1500. So this system here has sort of a dual purpose, if you will. Number one, we're gonna get a nice protective hitch cover here for the receiver tube on our truck to keep the inside of the trailer hitch free of any rust. Therefore, we don't have to worry about any troubles or headaches inserting our accessories. It also looks pretty nice too to have that black cover on there.

However, the main purpose of this kit here is gonna serve to protect our tailgate. So I'm sure you guys are aware of on the newer GMC and Chevy trucks, some of these models come with the MultiPro or the Multi-Flex tailgate system, depending on which model you have. GMC or Chevy, they both call these things the MultiPro or the Multi-Flex. They are, however, the same tailgate. Now, this is a great feature for your truck.

I really liked those tailgates. But there is one big problem a lot of consumers have come to know, and that's damage to the inner part of their tailgate while lowering it while they have a hitch-mounted accessory in place. Now, I know what you guys are thinking. You guys aren't gonna be the ones that are gonna do this, you're not gonna make that mistake by lowering the inner section of the tailgate with your ball mount in the trailer hitch there. But it's actually a little bit more common.

We hear of countless stories, horror stories, if you will, of people damaging their tailgate by lowering the center section while they have a ball mount in place. Let's face it, guys. This is a several thousand-dollar mistake. It's not one you guys wanna make yourselves. Therefore, you're definitely gonna wanna look into the sensor system.

So basically, how this works is there's actually gonna be a center built into our cover here. And what this sensor does is it cuts the circuit to the inner portion of our tailgate while it's opened. So right now, the sensor is closed. Therefore, our circuit is still active. So if we go ahead, lower the tailgate like we would normally. There's the main tailgate, and here is the center section, you can see it releases no problem, no issues whatsoever, normal functionality. So now, we've got our ball mount in there and we're ready to tow, but we need to get something out of our truck bed first that we forgot. So let's go ahead open up our tailgate here. Open up the main tailgate. Something's a little bit further back in there that I can't quite reach with the main tailgate down, so I'm gonna try to lower the center section here so I can reach back a little bit further. But as we can see here, the sensor system is overriding the tailgate functionality here on our vehicle, and I can't lower that center section. And that's great because if I we're to lower this, it would certainly come in contact with our hitch ball here, damaging our tailgate, costing us thousands in repairs. So in regards to installation, this one is very simple. It's definitely something I encourage you guys should try at home by yourselves. We really only need a couple common hand tools to be able to get this job done. We don't have to worry about lifting the vehicle and best of all, everything is plug and play. There's no splicing or alterations needed to your truck here, so it can remain completely stock and factory without voiding any warranties. Let's go ahead and walk you through this entire process step by step now. So to start your installation here, you're gonna be taking the upper half of your cover. You're gonna be placing that over the top of the receiver tube here. You'll notice that the collar on the receiver tube is gonna fit right into the indentation here of the cover. So we're just gonna place that over like so, and then we're going to take the bottom half. And again, this will only go on one way. There's a nice little indentation here in the bottom half of the cover that's gonna line up with the collar on the receiver tube. We'll simply place that onto there like so, and we're gonna hold them together, and then we're actually gonna close the cap to lock it in place. Now, we can begin securing the two halves together using the Allen head cap screws that come in your kit. You're gonna wanna place a flat washer over that cap screw there and insert it through the top hole just like so. And you're gonna take your nyloc nut and we're simply going to place this into bottom. So you actually don't need a wrench to hold that nut onto the bottom because there's actually a keeper in the bottom of that hole that's gonna hold it in place as you tighten it. So we're gonna get this one started with a couple turns here. We'll jump over to the other side and do that same thing. And then, we'll tighten 'em both down evenly, repeating back and forth, side to side, using a 5/32-inch Allen key. So keep in mind that while we're tightening it for the initial tightening here, just the first couple threads on the nut, you will need to hold the nut up into place in that retainer in order to stop it from spinning. But once you've tightened it enough, it will hold in place there. You don't have to worry about holding it from underneath. But again, just make sure we rotate back and forth and tighten the bracket as evenly as possible. We'll know we're done tightening when we don't have any movement with the cover on the receiver tube. We're actually just doing this by hand, we're not even using a ratchet. The cover here is gonna be made of plastic. Although it is durable, we can over-tighten, stress, and crack that plastic. You just wanna make sure not to tighten too much. As we can see here, give a good little shake here on the cover, you can see we have very little movement. We'll go ahead and tighten it down just a couple more times. That should be good to go after that. So next, we'll take our wiring harness here that's attached to the cover. We're gonna be routing this underneath the vehicle between the trailer hitch and the bumper, up over the trailer hitch over the spare tire, into a hole that's gonna be in the back of our bed in the center here. So we wanna make sure that we're routing this wiring harness on the passenger side. And then, the hole that we're gonna be coming out of here on the back of the bed, we can show you now. So in between our bed and our tailgate, in the center of the bed, you're gonna see that large oval hole there that we actually already have a few wires poking through. Basically, when we crawl underneath, we're gonna be reaching up under the truck here, and we're gonna be passing the connector through this hole there. So here's the wiring harness that comes directly from our cover here. As you can see, we have it routed behind the bumper and in front of the trailer hitch, up over the trailer hitch there where the bend is, and now we have it going up and over the spare tire, and inside of the holder here for the spare tire winch. And then, up in here is where we're gonna have that hole in the bed that our wire or our connector rather can pass through, it's the one that we showed you earlier up top. Now, we're gonna jump up top there, and we're gonna pull all the slack from our wiring harness through that hole. And we'll begin securing the harness to some existing wiring underneath here, so it doesn't fall down. So next, we need to remove a cover here over the tailgate. There's actually two covers. There's a smaller portion up here, and then there's the larger cover here, which is the bulk of the tailgate. So this is gonna be held on with 10 Torx screws. They're gonna be located along the outside edges here, on the inside as well. We're gonna remove those all using a T-20 Torx bit. And once we have all of our screws out, we should be able to remove the cover here by just simply lifting it out of place like so. So if you had a little bit of resistance getting this panel out, there is one pushpin fastener in the center here, which lines up with this slot here. Now, luckily, ours just sorta came free. We didn't need to use any additional tools. But if yours is hanging up a little bit more, you'll come in with this way with a trim panel tool and just slightly pry up to release that fastener. But most of 'em are loose enough that they'll just pull out when you pull the rest of the panel out. So next, we're gonna be lowering this intersection here of our tailgate by pressing the top button. Next, we'll be removing our tailgate locking mechanisms. We have one on the inside, one on the outside, on both sides of the vehicle. We're gonna be starting with the passenger side first and the outside main tailgate locking mechanism. So we'll take a 13-millimeter socket and we'll remove the two bolts holding that in place. Once we get 'em both loosened, we should just be able to remove 'em by hand. I'm gonna grab a hold of our cable here because it can fall. We don't want it to scratch the vehicle, so we'll just let it sit on the bumper there just like so. And now that we have the inside locking mechanism, remove that the same way we removed the outside one with a 13-millimeter socket. Now, we're gonna pull out the locking mechanisms here, starting with the outside one, maneuvering it out of place. And we do have a little connector here we have to remove. There's a red security tab on there. We'll just simply peel that back, and then we'll depress that center section there and it should just pop out. We'll do that for the inside one as well. Now, we do have a little pushpin fastener here, so we'll take our trim panel tool and pry that out to remove it. So now, we're gonna take the wiring harness that comes in your kit here, and you can see, we have two different sides with connectors on them. One is labeled the driver side, one is labeled the passenger side. We're working on the passenger side first, so we're gonna be dealing with these two connectors here. And these are simply just gonna be splicing in line with the connector here for the inside mechanism. So it's only gonna go in one way. You can see the connectors are different, one of them is much larger. Those are the ones we're gonna be dealing with. So we'll just simply insert that, locking into there. We should hear it click when it's locked into place. Don't forget to push down that red security tab. And then, this side here is gonna go to the inner locking mechanism. So now that we have our harness plugged in, we're going to re-install both the outside and the inside locking mechanisms in the reverse order that we removed it. So we'll start with the inside one first. I'll take the connector here from our new kit, plug it into the mechanism there till it locks in place, and then re-secure that red locking tab. And don't forget, we also have a clip here that goes into the standoff tab. And now, we'll just simply place it back into position and secure it with the factory hardware. So this outside one here is a little bit tight once you get the inside one in place. So you may need to move some wires out of the way temporarily in order to get everything to fit down in there. We also need to make sure that the tab here for the cable lines up with the square hole in the tailgate. So now, we're gonna take the other end of our wiring harness here, and we're gonna be routing this over to the driver's side. Now, thankfully, we already have some existing wiring that's sorta routed on the tailgate here. So we're just gonna simply zip tie it to this wiring harness using the zip ties that come in our kit in order to go over to the driver side. And then, we'll just repeat those same few steps we did over here to make our connections over there. So here, you can see we have our wiring harness routed here, securing it to the existing harness. You can see we have several zip ties, every few inches, to help secure it in place. Work our way to the middle point here. So in the middle of your harness, you're gonna have this singular connector. You're gonna leave this aside for now. We'll show you that a little bit later. So just keep on going all the way over to here. And now, we're to this point here where we have our two remaining connectors. And as we said, we'll just repeat the same process to attach these as we did over on the passenger side. And now, finally, we have one more connection. So the center connector here on the harness we just showed you, we have sitting right here. And what we're gonna do is we're gonna grab the other connector that came from the cover that we ran earlier. So we have it right now just routed between the tailgate and the bed. But what we're gonna do is we're actually gonna go back between here and go through the hole there in the center of the tailgate. So it's gonna line up perfectly with the hole that we routed it through earlier. We'll just simply place it through there, and then I'll reach in here to grab it and pull it out. Now, all that's left to do is to make our two connections here. We're gonna press in till we hear it click to lock into place. And now, what we're gonna do is we're gonna take a few more zip ties and we need to bundle this up and zip tie it to the existing harness here. I will say you do need to make sure that we have a little bit of slack here to open and close the tailgate. You don't wanna tie it too tight. So go ahead now and secure the rest of our wiring. Now, we'll just re-install our tailgate panel cover here in the reverse order that we removed it. And that's gonna do it today for our look and installation of the CURT protective MultiPro and Multi-Flex tailgate sensor here on our 2019 GMC Sierra 1500..


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Info for this part was:

Employee Joshua S
Video Edited:
Joshua S
Employee Jonathan Y
Video by:
Jonathan Y
Employee Conner L
Installed by:
Conner L
Employee Michael B
Installed by:
Michael B

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