The best technical support and full Tonneau Covers installation instructions. Lowest price Sierra Tonneau Covers guarantee and expert service. GMC Sierra, 2012 Tonneau Covers by Access are available from For expert service call 800-298-8924 to order your Access Original Soft, Roll-Up Tonneau Cover part number 834532007424, or order online at

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Tonneau Cover > 2012 > GMC > Sierra

Access Tonneau Covers for the 2012 Sierra by GMC

Access Tonneau Covers

(3 reviews)

Code:   834532007424



Shipping Special

Shipping Weight: 38 pounds


Access Original Soft, Roll-Up Tonneau Cover - 2012 Sierra by GMC

The original Access roll-up tonneau cover balances deluxe features with a reasonable price. Get the XT-Dial easy-grip tension adjuster, AutoLatch, Element weather seal and famous Slantback design. Cover sits 1-1/2" above your GMC Sierra's bed.


  • Custom-designed tonneau cover protects your GMC Sierra's bed and your gear
    • Sits 1-1/2" above truck box when closed
    • Slantback design gives your truck a stylish look
  • Aerodynamic cover reduces wind drag, improving gas mileage by up to 10 percent
  • Soft tonneau rolls up in seconds to allow full use of your bed
    • Peels back off the Velcro seal on sides of truck box
    • Stores neatly behind your cab with premium straps and clips
  • Truck bed is secure when cover is down and tailgate is locked (tailgate lock sold separately)
    • AutoLatch automatically engages when cover is closed
    • 1 Slide lock can be engaged for added security
  • Durable, black polyester mesh cover retains its shape and won't fade
    • Easy-to-grip XT-Dial lets you adjust tension and fit at the turn of a dial - no tools required
  • Element weather seal behind the cab and reinforced vinyl flap at the tailgate help to block rain, snow and dirt
  • Contoured, black powder coated aluminum rails and bows resist rust
  • Truck tailgate remains operational even when cover is closed
  • Aircraft-grade aluminum clamps secure tonneau rails inside truck-bed rails
    • Leaves side rails free for stake pocket and bed rail accessories
    • Includes 6 clamps for short-bed trucks or 8 clamps for long-bed trucks, depending on your application
  • Limited lifetime warranty
  • Made in the USA

The original Access tonneau has premium features at an economical price. This truck-bed cover rolls up so that you can haul bulky items and rolls down to shield and secure your GMC Sierra's bed and cargo. The custom-fit tonneau sits 1-1/2 inches above your truck bed and keeps air from getting caught by the tailgate, thus reducing drag. That can improve your gas mileage by up to 10 percent. And the exclusive Access Slantback fit angles toward your tailgate to give your truck a stylish, streamlined look.

Rolled Access Original tonneau cover with straps

Velcro closures on the sides help seal the cover to your truck box and allow you to peel it back quickly for loading. The tonneau stores neatly behind your cab, secured by premium storage straps that are designed to keep your cover from rubbing against the cab.

The cover fabric is reinforced polyester mesh coated with UV-blocking vinyl, so it won't fade in the hot sun. The material stays flexible down to -40 F and won't shrink, regardless of the temperature. Black powder coated aluminum bows act as ribbing to support your cover and make it easy to roll up.

XT Dial tension adjuster for Access Original tonneauElement seal behind cab for Access Original tonneau

Customize the cover tension by turning the XT-Dial easy-grip tension adjuster at the front of the cover, near your cab. The Element weather seal at the cab end and a reinforced vinyl flap at the tailgate help to keep out dirt, rain, snow and ice.

Tite Bite clamp for Access Original tonneau cover

The contoured, black powder coated aluminum tonneau rails resist rust. They sit inside your truck-bed rails so that you can still use stake-pocket-mounted accessories, such as ladder racks and tie-down anchors. Easily install the rails on a truck with an under-the-rail, drop-in bed liner. Over-the-rail liners can be cut to allow room for the installation clamps. The tonneau's rails attach easily to your truck-bed side rails using Tight Bite clamps. The specially designed teeth on these clamps seize the integrated ridges in the rails, ensuring a firm grip.

Auto Latch for Access Original tonneau coverSlide lock for Access Original tonneau cover

Once the tonneau cover is unrolled and in place, the AutoLatch engages automatically to hold the tonneau closed. To unlatch the cover, simply pull the cord for easy, one-hand operation. For added security, lock the tonneau using the slide lock opposite the latch. And locking the cover won't interfere with your tailgate - open and close it as usual or add a tailgate lock (sold separately) to get secure storage for your cargo. Cover your assets with this tonneau from Access.

12289 Agri-Cover Inc. (ACI) Original Rollup Truck Bed Cover

Customer Reviews

Access Original Soft, Roll-Up Tonneau Cover - 834532007424

Average Customer Rating:  4.7 out of 5 stars   (3 Customer Reviews)

The original Access roll-up tonneau cover balances deluxe features with a reasonable price. Get the XT-Dial easy-grip tension adjuster, AutoLatch, Element weather seal and famous Slantback design. Cover sits 1-1/2" above your vehicle's bed.

- 834532004782

by: Matt W.07/06/2013

Review from a similar Access Original in Tonneau Covers

Installed on a 2013 F150 with 6-1/2' foot bed. I had already installed a toolbox across the bed rails and then decided to add an Access cover since I knew I could get this tool box compatible version. I had an Access cover on a previous truck and knew I wanted the same brand again. Plan on buying additional bulb weather stripping as the cap between the tool box and the front of the bed is wide depending on tool box width. My gap was wider than what came with the installation kit. You have to put the toolbox exactly where it needs to meet the bed cover header. Installation was easy for the cover as the struggle was getting the toolbox weather stripping installed. I put the bulb seal in the kit on the front of the toolbox and then added my larger bulb weather stripping onto the front of the truck bed so that both mated up once the toolbox was put back into place per the instructions. Any local parts store should carry the seal material. I do like how you need to open the tailgate to operate the latching system. If you lock your tailgate, it cannot be accessed. My previous Access cover had a push button you could use to unlatch the cover with the tailgate closed. Not great if you want to keep other out of your truck bed. 87917


I have a 12 inch tool box installed on my 2013 ford F150 sxt can I grt a cover to fit this truck.

comment by: John B - 07/24/2013


The Access Toolbox edition covers will only work with tool boxes that are 20-21 inches wide. With a 12 inch wide box there will be a large gap and the tonneau will not work as designed.

Patrick B - 7/24/2013


Is this option able to work with a back rack toolbox combo?

comment by: Nathan D - 12/20/2013


The objects in front of the tonneau, between the tonneau and the cab, would have to total 20-21 inches. Measure from the inside edge of the truck bed up at the cab, and back. If your tool box does not end in the 20-21 inch windown, the tonneau will not properly fit.

Patrick B - 12/27/2013

- 834532006953

by: TB03/27/2009

Review from a similar Access Original in Tonneau Covers

OVER ALL VERY GOOD This is a nice cover. It is a changle to install. It took me a little over 2 hours to put in by my self. The problem is with the Ridgeline, NOT the cover. You must take all the bed walls off the truck and this takes time. There is drilling involved, but measure twice and drill once. I marked where the holes were going to go and put the wall back in the truck to make sure it was in the correct spot. The directions were fair, you just have to take your time and double check everything. I am sure if you have the correct tools you could do this job. It is well worth the time because it looks great when you are all done. 1686

- 834532004768

by: Jared07/15/2014

Review from a similar Access Original in Tonneau Covers

Installed much easier than expected, operation is convenient and easy, and my truck gained 1 mpg. Also purchased the tailgate seal and it made it surprisingly dust and weather tight. 141324


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    GMC Sierra Accessories

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    Tricia G

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