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Complete CURT Class 2 1-1/4" trailer hitch and 5-flat wiring kit (with 4-way to 5-way adapter for surge brakes) engineered for the 2005 - 2009 Buick LaCrosse CX & CXL only. Vehicle-specific fit, plug-and-play installation, all hardware and instructions included.
This custom kit fits the following vehicles:
All Hardware and Installation Instructions Included!
Whatever the next checkpoint is on your adventure -- whether it's getting your bike on the trail before sunrise or making it to the campground before dark -- CURT class 2 hitches let you Bring It with confidence. These receiver hitches are made to handle most light-duty towing applications and offer a custom fit for your vehicle. Typically used on full-size cars, crossovers, compact SUVs, minivans or even compact pickup trucks, a CURT class 2 trailer hitch complements the design of smaller vehicles. This particular class 2 hitch is made to be a custom hitch for certain years of the Buick Allure, Century, LaCrosse and Oldsmobile Intrigue (to verify vehicle compatibility, see application info). It offers a weight carrying capacity of 3,500 lbs. GTW and 350 lbs. TW. Class 2 trailer hitches can typically be used to tow a variety of lightweight trailers, such as a small utility trailer, small fishing boat trailer or popup camper (NOTE: Never exceed the lowest weight capacity of any towing component). They are also perfect for adding cargo space to your vehicle with a bike rack or cargo carrier. This class 2 hitch features a 1-1/4" receiver tube to accept a ball mount shank or other hitch-mounted accessory. For safety, it is tested in accordance with SAE J684. A custom trailer hitch design requires extra care, and as such, CURT class 2 hitches are engineered using real vehicles and hands-on research. We use high-strength steel, robotic welding and rigorous testing to produce hitches that are built to fit your lifestyle. To ensure that each hitch will be a reliable extension of your vehicle, we also finish our hitches in a co-curing of liquid A-coat and black powder coat, giving them long-lasting rust and wear resistance.
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 Buick LaCrosse (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 |
|---|---|---|
| 2005 - 2009 | Buick LaCrosse | CX & CXL only |
Yes, the 05 - 09 Buick LaCrosse CX & CXL only Curt 1-1/4" Class 2 Trailer Tow Hitch + 5-Flat Wiring Kit Tow Boat/Utility Trailer with Surge Brakes 12239 (Part #5W-CHW-205) is designed to fit the 2005-2009 Buick LaCrosse.
The 05 - 09 Buick LaCrosse CX & CXL only Curt 1-1/4" Class 2 Trailer Tow Hitch + 5-Flat Wiring Kit Tow Boat/Utility Trailer with Surge Brakes 12239 (Part #5W-CHW-205) fits 2005-2009 Buick LaCrosse models. The 2009 model year is the last year covered by this part number. For newer models, check for an updated version.
The 05 - 09 Buick LaCrosse CX & CXL only Curt 1-1/4" Class 2 Trailer Tow Hitch + 5-Flat Wiring Kit Tow Boat/Utility Trailer with Surge Brakes 12239 (Part #5W-CHW-205) fits the following vehicles: 2005-2009 Buick LaCrosse. Always verify your specific year, make, and model before ordering.
The 05 - 09 Buick LaCrosse CX & CXL only Curt 1-1/4" Class 2 Trailer Tow Hitch + 5-Flat Wiring Kit Tow Boat/Utility Trailer with Surge Brakes 12239 (Part #5W-CHW-205) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
Curt part number 12239 is designed for 05-current Buick Allure, 05-current Buick LaCrosse, 97-06 Buick Century Passenger, and 98-02 Oldsmobile Intrigue. Check your vehicle year and model against this list. If your vehicle is not listed, this hitch is not compatible.
Curt hitch 12239 is designed for use with ball mount D-221 / 45522. Use only this ball mount with this hitch.
The manual lists a gross load capacity when used as a weight-carrying hitch, but the specific weight values are not printed in this copy of the manual. Contact Curt Manufacturing technical support at 1-877-287-8634 for the exact towing and tongue weight capacity. Do not exceed your vehicle manufacturer's recommended towing capacity.
The kit includes: 4× .250 × 1.50 × 2.00" square hole spacers (CM-SP1), 4× 1/2-13 UNC 1-1/4" grade 8 carriage bolts, 4× 1/2-13 UNC grade 8 serrated flange nuts, 4× 1/2" flat washers, 2× 1/2" lock washers, 2× 1/2-13 UNC 1-1/4" grade 8 hex cap screws, 2× 1/2-13 UNC grade 8 handle nuts, 4× .188 × 1.00 × 2.38" round hole spacers (CM-SP35), 4× 7/16-14 UNC grade 8 serrated flange nuts, 1× 1/2" fishwire, and 4× 7/16-14 UNC 1" grade 5 hex cap screws.
Yes. Step 1 requires you to detach 4 rear rubber exhaust hangers from the frame and lower the exhaust system to access the frame rails for installation. The exhaust hangers are reinstalled in step 6 after the hitch is secured.
Yes, drilling is required. Step 4 requires you to drill 2× 1/2" holes in the side of the frame rails using the hitch as a template. This is a permanent modification to the vehicle frame.
Fascia trimming may be required on Buick LaCrosse "Super" models. Check your vehicle after positioning the hitch. If the fascia interferes, trimming will be necessary.
1. Detach 4 rear rubber exhaust hangers and lower the exhaust system. 2. Use fishwire to thread carriage bolts and spacers through frame rail access holes. 3. Raise the hitch into position and finger-tighten with flange nuts. 4. Drill 2× 1/2" holes in the frame rail sides using the hitch as a template. 5. Check side-to-side clearance; install 1/2" washers as needed to eliminate gaps. Insert 1/2" hex bolts and lock washers through the frame and secure with handle nuts. 6. Reinstall exhaust hangers. For LaCrosse, use 7/16" hex bolts, spacers, and flange nuts. 7. Torque all 1/2" fasteners to 110 lb-ft and all 7/16" fasteners to 42 lb-ft.
Fishwire fasteners are flexible wires used to thread carriage bolts and spacers through access holes in the frame rails before the hitch is raised into position. In step 2, you thread the 1/2" fishwire (included) through the access holes, attach the carriage bolts and spacers to it, and pull them through to the other side. This allows you to position the fasteners before the hitch is in place.
The installation diagram shows two sets of holes on the frame rails: one labeled "USE THIS HOLE ON LACROSSE" and another labeled "USE THIS HOLE ON CENTURY & INTRIGUE". Use the hole marked for your specific vehicle model. The LaCrosse installation also uses 7/16" hex bolts, spacers, and flange nuts to lower the exhaust system, whereas other models use different fasteners.
Torque all 1/2" fasteners to 110 lb-ft and all 7/16" fasteners to 42 lb-ft. This applies to all bolts, nuts, and hex cap screws in the assembly.
Step 5 instructs you to check side-to-side clearance between the hitch and frame. If a gap exists, install 1/2" flat washers between the hitch and frame as necessary to eliminate the gap before inserting the 1/2" hex bolts.
All non-trailer loads applied to this hitch must be supported by auxiliary stabilizing straps. Failure to properly support non-trailer loads will void the product warranty. Do not rely on the hitch alone to support non-trailer loads.
No. The manual explicitly states: "DO NOT EXCEED VEHICLE MANUFACTURER'S RECOMMENDED TOWING CAPACITY." Even if the hitch has a higher capacity, you must follow your vehicle manufacturer's limits.
Periodically check the receiver hitch to ensure that all fasteners are tight and that all structural components are sound. This is an ongoing maintenance requirement, not a one-time check.
Contact Curt Manufacturing technical support at 1-877-287-8634. They can answer questions about installation, fitment, capacity, and troubleshooting.
Curt Manufacturing warrants this product to be free of defects in material and/or workmanship at the time of retail purchase by the original purchaser. If defective, Curt may repair or replace the product at their option when returned prepaid with proof of purchase. Alteration, misuse, or improper installation voids the warranty. Curt's liability is limited to repair or replacement and excludes incidental or consequential loss or damage.
Yes, if your vehicle is a 05-current Buick Allure, 05-current Buick LaCrosse, 97-06 Buick Century Passenger, or 98-02 Oldsmobile Intrigue. Otherwise, no.
Yes, you must drill 2× 1/2" holes in the frame rails. Fascia trimming may also be required on Buick LaCrosse Super models.
You must detach and lower the exhaust system to access the frame rails, then reinstall it after the hitch is secured.
Torque all 1/2" fasteners to 110 lb-ft and all 7/16" fasteners to 42 lb-ft.
The manual does not list the specific capacity values. Contact Curt technical support at 1-877-287-8634. Do not exceed your vehicle manufacturer's recommended towing capacity.
Use ball mount D-221 / 45522 only.
Yes, the Curt 56340 custom wiring harness is designed for Buick LaCrosse passenger cars. The harness connects to the vehicle's taillight wiring connectors behind the rear scuff panels on both the driver and passenger sides.
Buick LaCrosse (passenger cars only).
The Curt 56340 is a custom wiring harness that connects to your vehicle's taillight wiring to provide power for trailer lighting. It features a 4-flat connector for attaching a trailer light plug.
You will need a panel trim removal tool, a flat blade screwdriver, and a cutting tool. These are the minimum tools required to complete the installation.
The harness includes a 4-flat dust cover and cable ties for securing loose wires. The manual does not specify the exact quantity of cable ties or other included components.
Yes, you must disconnect the negative battery terminal before beginning installation. This is the first step in the installation process and is required for safety.
Yes. Disconnect the negative battery terminal on the driver side under the hood before starting.
Remove the rear scuff panel by first removing its fasteners, then pulling out on the bottom and up. Take care not to damage the alignment tabs on the back. Once removed, pull back the felt liner to locate the taillight wiring harness connectors.
Remove the push fastener, cargo fastener, and Phillips screw from the felt liner on the driver side. Repeat this process on the passenger side after routing the harness.
Separate the vehicle's taillight wiring harness connectors from the taillight housing, taking care not to damage the locking tabs. Insert the custom wiring harness end with the yellow wire between the separated connectors on the driver side. Make sure the connectors are fully inserted with locking tabs in place. Repeat on the passenger side using the harness end with the green wire.
The yellow wire end connects to the driver side taillight connectors, and the green wire end connects to the passenger side taillight connectors. These colours identify which end of the harness goes to each side of the vehicle.
When in use, route the 4-flat connector to the center of the vehicle for easy access to your trailer. When not in use, roll it up and store in a convenient, out-of-the-way location to prevent damage.
Secure any loose wires with the provided cable ties. This prevents the wires from moving around and potentially becoming damaged or creating a safety hazard.
Yes, you must reinstall all items removed during installation, including the rear scuff panel and felt liner. After reinstalling, reconnect the negative battery terminal and install the provided 4-flat dust cover.
The manual states you must not exceed the product rating or the tow vehicle lamp load rating, whichever is lower. However, the specific product rating is not provided in the installation instructions. Contact Curt Manufacturing or consult your vehicle's owner manual for the exact amperage or wattage rating.
No. Do not exceed the product rating or tow vehicle lamp load rating, whichever is lower. Exceeding the rating can cause loss of warranty, overheating, and potential fire.
Test for proper function by using a test light or by connecting a properly wired trailer to the 4-flat connector. All steps must be followed to ensure the wiring harness functions properly before use.
Yes, install the provided 4-flat dust cover after reconnecting the battery. The dust cover helps prevent corrosion of the connector when the harness is not in use.
Yes, take care not to damage the alignment tabs on the back of the scuff panel when removing it. Pull out on the bottom first, then up, to avoid breaking these tabs. Damage to the alignment tabs may prevent proper reinstallation.
Yes, take care not to damage the locking tabs on the vehicle's taillight wiring harness connectors when separating them from the taillight housing. Damaged locking tabs may prevent the connectors from seating properly.
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