2016-2020 Kia Optima Trunk Side Trim Panel: Damage, Fitment, and Replacement Guide
This guide covers the essential details for identifying and replacing the left or right trunk side trim panel in your 2016-2020 Kia Optima, including part numbers and hybrid model considerations.
- This is a trunk side trim panel, NOT a passenger seat cover.
- Verify the correct side (Left/Driver or Right/Passenger) before purchasing.
- Fitment for Hybrid and Plug-In Hybrid models may be different; match the part to your specific Optima model.
- When buying used, the most important inspection is checking the back for intact mounting clips and tabs.
Symptoms of a Damaged Trunk Side Trim Panel
Failure of this part is purely cosmetic or structural and will not affect the vehicle's drivability. Damage is almost always caused by loading or unloading cargo, or from items shifting during transit.
- Visible Cracks or Gouges: The most common issue is physical damage from sharp or heavy objects hitting the panel.
- Stains or Discoloration: Spills from liquids can permanently stain the carpeted surface.
- Loose Fitment or Rattling: The plastic clips or mounting points holding the panel to the car's body can break. This will cause the panel to become loose, move around, and potentially rattle against the metal frame, especially while driving.
- Warping or Deforming: Extreme heat or moisture from spills can cause the panel's backing board to warp, ruining its shape and fit.
Known Issues, TSBs, and Recalls
There are no Technical Service Bulletins (TSBs) or recalls issued specifically for the trunk side trim panels on the 2016-2020 Kia Optima. Issues with this part are related to wear and tear or physical damage rather than a manufacturing defect.
Related Recall Notice: While not involving the trim panel itself, a significant recall (NHTSA Campaign Number 23V594) was issued for 2016-2018 Optima models, including Hybrid and Plug-in Hybrid variants. The trunk latch base could crack, preventing the trunk from being opened from the inside with the emergency release. This poses a safety risk. 🎬 Watch this news report on the trunk latch recall. Before working in your trunk, it is critical to verify with a Kia dealer or on the NHTSA website that this recall has been performed on your vehicle.
🎬 See how to replace the trunk latch yourself.Buying a Used Trunk Side Trim Panel
A used OEM panel is an excellent, cost-effective alternative to a new part. Since this is a cosmetic item, a visual inspection is key.
What to Check Before You Buy:
- Verify the Side: This is the most common mistake. Ensure you are buying the correct side for your needs—Left (Driver Side) or Right (Passenger Side). Part numbers are side-specific.
- Inspect All Mounting Points: Carefully examine the back of the panel. Look for broken or stressed plastic clips, tabs, and mounting holes. These are essential for a secure, rattle-free installation. A panel with broken tabs will never fit correctly.
- Check for Physical Damage: Look for deep gouges, cracks, or holes on the front-facing surface. Minor scuffs are normal for a used trunk part, but significant damage cannot be repaired.
- Look for Stains and Warping: Check for any dark spots, water marks, or discoloration from spills. Lay the panel on a flat surface to ensure it is not warped or bent out of shape.
- Confirm Hybrid vs. Non-Hybrid: The trunk configuration of the Optima Hybrid and Plug-In Hybrid models may differ due to the placement of the high-voltage battery. This can affect the shape and size of the side trim panels. Always confirm the donor vehicle was the same type as yours (standard, hybrid, or plug-in hybrid).
Cost of 2016-2020 Kia Optima Trunk Side Trim Panel
| Part Type | Estimated Cost |
|---|---|
| New OEM | $170 - $260 |
| New Aftermarket | Not commonly available |
| Used OEM | $50 - $120 |
| Shop Labor to Install | $50 - $100 |
Replacement Information
Replacing the trunk side trim panel is a straightforward DIY task that requires basic tools. The main challenge is carefully prying the panel off without breaking the plastic clips.
- Difficulty: 2/5
- Estimated Time: 0.5 hours
- Tools Needed: Plastic trim removal tool set, socket set (for any cargo hooks or tie-downs).
Pro Tip: Always use plastic trim removal tools instead of a screwdriver. Metal tools will easily scratch or gouge the plastic trim and surrounding painted surfaces.
Technical Specifications and Part Numbers
These part numbers are for the main side trim panels. Always verify the exact part number with a dealer using your vehicle's VIN before ordering.
| Side | Part Name | Part Number(s) |
|---|---|---|
| Left (Driver) | Trim Partition Side LH / Trim Assembly Luggage Side | 85784-D5000WK, 85730-D5000WK |
| Right (Passenger) | Trim Partition Side RH | 85785-D5000WK, 85785-D5000 |
Frequently Asked Questions (FAQ)
Is this the same as a seat cover?
No. Despite some confusing internal naming, this is a hard, carpeted trim panel for the side of the trunk (luggage compartment). It is not a fabric cover for any of the passenger seats.
Will this part fit an Optima Hybrid or Plug-In Hybrid?
Maybe not. The Hybrid and Plug-In Hybrid models have a large battery pack that reduces trunk space and can change the shape of the trunk interior. This may require different side trim panels. It is critical to source this part from a vehicle that matches your exact powertrain (gas, hybrid, or plug-in hybrid).
Can I fix a cracked or broken panel?
Generally, no. The panels are made of a molded composite material that is difficult to repair effectively once cracked. Attempts to glue or patch the panel will likely be visible and may not hold. Replacement is the best option.
Do I need to disconnect the car battery to replace this panel?
No. This trim panel does not typically have any electrical components attached to it, so there is no need to disconnect the battery for replacement.
Helpful Videos
Technical Specifications
OEM Part Numbers: 85784-D5000WK 85730-D5000WK 85785-D5000WK 85785D5000
Molded composite with carpeted finish. Attaches with plastic clips.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Kia Optima:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Symptoms of a Damaged Trunk Side Trim Panel
- Known Issues, TSBs, and Recalls
- Buying a Used Trunk Side Trim Panel
- What to Check Before You Buy:
- Cost of 2016-2020 Kia Optima Trunk Side Trim Panel
- Replacement Information
- Technical Specifications and Part Numbers
- Frequently Asked Questions (FAQ)
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