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Vehicle battery connection required
Warranty: One-Year Limited Warranty
Electrical System Type: 3W
Output Type: 4-Way Flat
Tail Light Circuits: 6.0 Amps
Turn and Brake Circuits: 3.0 Amps
Installation Difficulty: Professional
Installation Time Exact (Minutes): 45
If your vehicle is not equipped with wiring for towing a trailer, CURT custom wiring is the ideal solution. A custom wiring harness -- also called a T-connector -- is a simple, plug-and-play electrical device that plugs into your automotive electric system and provides a standard, universal trailer wiring connection. This is done using two or more vehicle-specific, OEM-compatible connectors to plug into the taillight assembly, eliminating the need for cutting, splicing and soldering during installation. Custom wiring harnesses are made vehicle-specific, and while they are not available for all vehicles, they do offer one of the fastest, easiest and most secure ways to wire a vehicle for towing. This particular plug-in harness provides a 4-way flat connector socket and is designed to be a custom wiring harness to fit certain years of the Kia Sorento (to verify your vehicle compatibility, see application info). It comes with all necessary wiring components to establish a reliable trailer wiring connection, as well as a dust cover to keep the connector clean when not in use. You have a picture in mind of your next destination -- maybe it's the boat landing at your favorite fishing spot, maybe it's a campsite that overlooks one of nature's masterpieces, or maybe it's the next big jobsite. However, turning that picture into a reality takes more than just daydreaming. It takes a solid connection and the right amount of power. CURT custom wiring is made with some of the most sophisticated technology in the industry and is designed to install with ease, giving you a long-lasting electrical connection for your towing hitch setup.

CURT offers a variety of high-quality trailer hitches and accessories for select vehicle models. Find the perfect fit for your towing needs at TowUniverse.
CURT, a Lippert brand, offers a complete line of towing products and is the leading manufacturer of custom-fit trailer hitches. We offer the broadest selection of custom-fit hitches, and each one is designed, welded, and coated in Wisconsin.
CURT is also a leader in flat towing products, as well as 5th wheel, gooseneck, and weight distribution hitches, ball mounts, electrical components, cargo solutions, and other towing accessories.
For everything from passenger cars and vans to full-size pickups and SUVs, CURT is 'The First Name in Towing Products®.'
Experts available to answer your questions
Call 888-634-94941 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2016 - 2018 | Kia Sorento | Installation Time: 30-60 minutes |


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Yes, the CURT 56256 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Kia Sorento (Part #BKDK56256) is designed to fit the 2016-2018 Kia Sorento.
The CURT 56256 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Kia Sorento (Part #BKDK56256) fits 2016-2018 Kia Sorento models. The 2018 model year is the last year covered by this part number. For newer models, check for an updated version.
The CURT 56256 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Kia Sorento (Part #BKDK56256) fits the following vehicles: 2016-2018 Kia Sorento. Always verify your specific year, make, and model before ordering.
The CURT 56256 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Kia Sorento (Part #BKDK56256) Typical installation time is 30-60 minutes. Basic hand tools are typically all you need.
Part number 56256 is confirmed to fit Kia Sorento EX 2.0L 4cyl and Kia Sorento Limited 2.0L 4cyl models. If your Sorento is a different model year, trim level, or engine size, contact the manufacturer or check the vehicle fitment database to confirm compatibility.
The harness is rated for 3.0 amps per side on signal circuits and 6.0 amps total on tail/running circuits. The battery connection must be fuse-protected with a 10-amp maximum fuse. Do not exceed the product rating or the tow vehicle lamp load rating, whichever is lower, as exceeding the rating can cause loss of warranty, overheating and potential fire.
Required tools are: ratchet, 10mm socket, Phillips screwdriver, panel trim removal tool, wire stripper, wire crimper, and cutting tool. You will also need grommet sealant and cable ties, which are not included with the harness. A piece of wire (not included) is needed to route the harness during installation.
Yes. Step 1 requires you to locate the vehicle battery on the driver side under the hood and disconnect the negative battery terminal before beginning any installation work.
Remove the two 10mm screws securing the taillight housing. Depending on trim level, you may need to locate two nuts on the inside of the vehicle behind the side trim panel instead. Loosen the taillight by gently pulling rearward and out. Behind the taillight housing you will find the connection for the taillight wiring harness. Separate the connector from the taillight housing, taking care not to damage the locking tabs, and set the taillight aside.
From inside the vehicle, route all wiring harness wires except the 4-flat through the exposed hole. Use a piece of wire (not included) to route the custom wiring harness end with the yellow wire up behind the side trim panel and out of the hole below the taillight. Repeat this process on the passenger side using the harness end with the green wire.
Insert the custom wiring harness end with the yellow wire between the separated taillight connectors. Make sure the connectors are fully inserted with locking tabs in place. Repeat this process on the passenger side using the harness end with the green wire. Take care not to damage the locking tabs during insertion.
You may be able to use an existing screw with nut in the vehicle frame as a grounding point near the connector. If no suitable existing point is available, you will need to drill a 3/32" pilot hole for the provided screw. The area should be free of rust, dirt and paint. Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury.
Modify the grommet removed from the floor pan by carefully removing it from the vehicle wiring harness without cutting any wires. Using electrical tape, place the grommet on the wiring harness wires and black power wire passing through the hole in the floor pan. Use a cable tie to help fasten the grommet around the wires. Seat the grommet in the floor pan and use sealant (not included) to seal where the wires pass through and where the grommet was cut.
Locate a flat spot inside the vehicle near the taillight and adhere the black converter box using the provided double-sided tape.
When in use, route the 4-flat to the center of the vehicle. When not in use, roll it up and store in a convenient, out-of-the-way location. Install the provided 4-flat dust cover to help prevent corrosion.
All steps must be followed to ensure the wiring harness functions properly. Once installed, test for proper function by using a test light or connecting a properly wired trailer.
The battery connection must be fuse-protected with a 10-amp maximum fuse. Exceeding this rating can cause loss of warranty, overheating and potential fire.
The Curt 56256 fits Kia Sorento EX 2.0L 4cyl and Kia Sorento Limited 2.0L 4cyl. Verify your model year and trim level match before purchasing.
Grommet sealant, cable ties, and a piece of wire for routing are required but not included. You will also need a 10-amp fuse for the battery connection.
Yes, disconnect the negative battery terminal before beginning installation.
Drilling may be required only if no existing screw with nut is available for the ground wire connection. If drilling is needed, a 3/32" pilot hole is required. Check for hidden items before drilling.
Signal circuits are rated 3.0 amps per side; tail/running circuits are rated 6.0 amps total. Do not exceed these ratings or the tow vehicle lamp load rating, whichever is lower.
A 10-amp maximum fuse is required. Exceeding this rating can cause loss of warranty, overheating and potential fire.

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