2025-2026 Mazda CX-70 Underfloor Cargo Compartment: A Deep Dive

Understanding the CX-70's Underfloor Storage System

The Mazda CX-70 is built on the same platform as the three-row CX-90, but as a dedicated two-row SUV, it offers significantly more dedicated cargo space. A major benefit of this design is the expansive underfloor storage area, often called a sub-trunk. By lifting the main cargo floor panel, you gain access to a series of molded plastic compartments. These are designed to be deep and functional, suitable for more than just a tire repair kit; they can conceal laptop bags, shopping, or other valuables.

This storage system is a standard feature across the CX-70 lineup. While the overall cargo volume is consistently reported as 39.6 cubic feet behind the second row, it is important to note that Mazda also offers accessory organizers and dividers that fit within these compartments to further enhance organization.

Common Damage on a Used Cargo Storage Compartment

As a non-mechanical part, the cargo storage compartment does not 'fail' in a traditional sense. Instead, damage is purely physical. When inspecting a used unit, look for the following issues:

• Cracks and Fractures: Heavy or sharp objects dropped into the compartment can cause the plastic to crack. Inspect the bottom and corners carefully for any signs of stress or splitting.
• Warping or Deformation: Exposure to extreme heat or heavy loads stored for long periods can cause the tub to lose its shape. A warped compartment may not sit correctly in the vehicle floor, leading to rattles or an uneven cargo surface.
• Chemical Damage and Stains: Spills from chemicals like bleach, oil, or solvents can stain and weaken the plastic. Check for discoloration or areas where the plastic feels brittle.
• Broken Mounting Points or Tabs: The compartment assembly may have specific tabs or clips that secure it to the vehicle's body. Ensure these are all intact. A unit with broken tabs may shift or vibrate while driving.
• Missing Lids or Dividers: The underfloor system may have separate lids for different sections. Ensure these are present and that their hinges or clips are not broken. If the vehicle came with an accessory organizer, check if those pieces are included.

Buying a Used 2025-2026 CX-70 Storage Compartment: What to Check

Since the CX-70 is a new model, the market for used parts is still developing. However, if you are sourcing a replacement from a recycled vehicle, a used OEM compartment is often the best choice. Aftermarket versions of this type of part are rare and typically suffer from poor fitment.

Before you buy, follow this checklist:

1. Perform a Thorough Physical Inspection: Using the damage list above, check every inch of the plastic tub. Minor scuffs are acceptable, but deep gouges, any cracks, or warping are reasons to reject the part.
2. Verify Compatibility: The CX-70 is available in Mild Hybrid (MHEV) and Plug-in Hybrid (PHEV) versions. While official cargo volume figures are identical for both, suggesting the underfloor storage is the same, you should always visually compare the used part to your original. Pay close attention to the shape and depth, as subtle differences could exist to accommodate hybrid componentry.
3. Check for All Components: Ensure any associated lids, covers, or factory-included dividers are part of the sale. Sourcing these small pieces separately can be difficult and expensive.
4. Cleanliness: A clean, well-cared-for part from a low-mileage vehicle is always preferable. Heavy dirt or signs of abuse suggest the rest of the donor vehicle was not well-maintained.

Known Issues, TSBs, and Recalls for the 2025-2026 MAZDA CX-70

As of late 2024, there are no recalls or Technical Service Bulletins (TSBs) that directly affect the physical cargo storage compartment. However, the 2025 CX-70 has been subject to several recalls related to software and electrical systems, which are important for any owner to be aware of:

• Software-Related Loss of Power: Recalls have been issued to reprogram the Powertrain Control Module (PCM) and Engine Control Module (ECM) to prevent a potential loss of drive power.
• Inaccurate Fuel Gauge: Some Mild Hybrid (MHEV) models were recalled because the fuel gauge could display an incorrect reading, potentially causing the vehicle to run out of fuel unexpectedly.
• PHEV Inverter Software: A recall was issued for PHEV models to update inverter software that could cause warning lights to malfunction and a loss of power in EV mode.

Cost of a Replacement Cargo Storage Compartment

Because this is a large, vehicle-specific interior part, new aftermarket options are generally not available. Your main choices are a new part from a Mazda dealer or a used OEM part from a vehicle recycler.

Installation: Is This a DIY Job?

Yes, replacing the underfloor cargo compartment is an easy DIY task.

• Difficulty: 1 out of 5
• Estimated Time: 15 minutes
• Tools Needed: None. A plastic trim removal tool may be helpful but is not usually required.

The process simply involves opening the rear hatch, lifting the cargo floor panel, and lifting the old storage tub straight out of the vehicle. The new unit drops directly into the same space. Ensure it is seated properly before replacing the floor panel.

Related Accessories

Mazda offers several official accessories that integrate with the cargo area:

• Cargo Organizer (Part No. KR9D-V0-370): A set of removable dividers that fit inside the underfloor compartment to keep items separated.
• Rubber Cargo Tray (Part No. KR9D-V0-360A): A durable, custom-fit tray that protects the cargo floor from spills and damage.
• Carpet Cargo Mat (Part No. KR9D-V0-380): A plush carpet mat for the main cargo floor.
• Cargo Storage Shelf: An accessory shelf that adds a second level of organization within the cargo area.

Frequently Asked Questions (FAQ)