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Hyundai Genesis G80 rear strut assembly replacement comes down to three things: the right OEM part numbers, the correct fitment for your model year, and a disciplined installation. When a rear strut fails you get uneven tire wear, leaking fluid, or abnormal noises — and the fix is a verified replacement, not a guess.

This guide covers the Hyundai Genesis G80 (model years 2015-2017). It lists the rear OEM reference numbers 55310-3S000 and 55320-3S000, the failure symptoms to watch for, the diagnostic trouble codes (DTCs) tied to the electronic suspension system, and a step-by-step replacement procedure.

It is written for owners, technicians, and buyers comparing replacement parts. Nothing here relies on assumptions about year, trim, or engine configuration — every point starts with what you verify on your own car.

Fitment and OEM part numbers

The rear position on this platform uses two OEM reference numbers: 55310-3S000 and 55320-3S000. The source of truth is the number printed or stamped on the strut you remove from the car. Write it down before you order, then match it against the seller's fitment notes and the part itself.

If both rear corners are worn, the rear strut kit for the Genesis G80 covers both sides in a single order and a single work session. If only one corner failed, the left and right assemblies are listed separately, so you replace just the damaged side.

What to verify before ordering

Start with the vehicle year, make, model, engine or drivetrain, and the original equipment number printed on the removed part. A similar-looking component can still be incompatible, so match connector shape, mounting points, dimensions, and left/right position before you pay.

• Record the VIN and exact trim level.
• Compare the OE or interchange number and connector layout.
• Check whether the part is front/rear, left/right, or a complete set.
• Inspect nearby components that could cause the same symptom.

Keep the original strut until the new one has been test-fitted and confirmed. The old unit is your physical reference for connector orientation and mounting geometry, and it settles any fitment argument in seconds.

Symptoms of a failing rear strut

Three symptoms show up most often when a rear strut is worn out:

• Uneven tire wear. The tread stops wearing evenly once the strut no longer controls wheel movement.
• Leaking fluid. Fluid on or running down the strut body means the damper has lost its seal.
• Abnormal noises. Clunks, knocks, or rattles over bumps point to a worn unit.

Any one of these justifies pulling the wheel and inspecting the strut. If you see two or more, plan the replacement instead of waiting for the ride to get worse.

Electronic suspension and diagnostic trouble codes

The Genesis G80 carries an electronic suspension system, and that system logs diagnostic trouble codes when a component or circuit misbehaves. This works in your favor twice: a code can point you toward a failing component early, and it can tell you after the repair whether something is still wrong.

If a warning light stays on after the new struts are installed, scan the relevant codes and verify the repair instead of replacing additional parts at random. The code points at the component that still needs attention.

SAE standards behind aftermarket replacements

Aftermarket replacement struts for this application are evaluated against two SAE standards: J670 (Vehicle Dynamics Terminology) and J2410 (Suspension System Test Procedures). J670 defines the terminology used to describe vehicle dynamics; J2410 defines the test procedures used to evaluate suspension systems. Treat compliance with both as a baseline when you compare suppliers.

Replacement procedure, step by step

Work through the job in order and let the workshop manual settle the details — it carries the exact torque values and calibration steps for your trim. Disconnect power when the procedure requires it, especially with electronic suspension connectors in the circuit, and support the vehicle correctly before anything comes off.

1. Remove the wheel and disconnect any wiring routed to the strut, noting connector positions.
2. Remove the fasteners holding the strut and extract the old assembly.
3. Clean the mating surfaces before the new unit goes in.
4. Install the new strut, start all fasteners by hand, then torque them to the workshop manual values in the specified sequence.
5. Route wiring away from heat sources and moving parts, secure it with the original clips, and reinstall the wheel.
6. Test the repair before returning the vehicle to service.

After the test, confirm the warning lights stay off. If one comes back on, scan the diagnostic codes, recheck the connector you touched during the job, and compare the installed part with the removed one before buying anything else.

Rear kit or single corner: how to choose

The condition of both rear corners decides this. When both struts are worn or leaking, the rear kit handles the axle in one order. When damage is limited to one side, order only the corner that failed: the rear right strut assembly or the rear left strut assembly.

Left and right units differ in mounting and connector layout, so confirm the side against your car before checkout. Whichever option you pick, apply the same criteria: verified compatibility, material quality, warranty coverage, and clear product photos.

For safety-critical systems such as brakes, steering, sensors, and fuel delivery, use the vehicle-specific specification rather than a universal substitute — and hold suspension parts to the same standard.

Specifications at a glance

Rule of the job: match the OE number on the removed strut, record the VIN and trim level, and torque every fastener to the workshop manual values. Skip any one of the three and you risk doing the same work twice.

Related parts and reading

Planning several chassis jobs at once? The Steering & Suspension collection gathers the related categories in one place, so you can line up everything the rear axle needs before you start turning wrenches.

If a wheel and tire project is next, read the fitment guide for 2X 1-inch wheel spacers (5x4.5, 12x1.5) for the Hyundai Genesis Coupe, Veloster, and Tucson before you change wheel offset on any Hyundai in your garage.

Frequently asked questions

Talk to KOEEP before you order

Unsure about trim, connectors, or the left/right split? Get an answer before money changes hands:

• Request a fitment quote — send the VIN and the OE number printed on your removed strut.
• Email support@koeep.com — attach photos of the old part and its label for a direct match.
• Message KOEEP on WhatsApp — the fastest route for quick questions mid-teardown.