2016-2022 BMW 750e xDrive Trunk Storage Box: Fitment, Damage, and Replacement
This guide covers the unique trunk storage box for the BMW 750e hybrid, focusing on how to inspect a used part for damage and why correct fitment is critical.
- This storage box is specific to the G12 plug-in hybrid models (750e, 745e, 740e); the part from a non-hybrid 7-Series will not fit.
- Failure is always physical damage like cracks or warping; there are no electronic or mechanical components.
- When buying used, verify part number 51477360175 and inspect carefully for cracks and ensure it sits flat.
- While the box itself is simple, check the trunk area for signs of water leaks, a known issue that can cause more serious problems.
Overview: The Hybrid's Trunk Organizer
The trunk floor storage box, also known as a storage tray, for the 2016-2022 BMW 750e xDrive is a part born from compromise. To accommodate the plug-in hybrid system's battery, BMW significantly altered the trunk area compared to the standard gasoline-powered G12 7-Series. This results in less overall cargo space, and this storage box is designed to make the most of what remains. It is a molded plastic tray that drops into the trunk floor, providing a dedicated spot for small items that would otherwise roll around. Because it is shaped to fit around specific hybrid components, it is not interchangeable with parts from a non-hybrid 7-Series.
Symptoms of a Bad Trunk Storage Box
As a simple, non-electronic piece of molded plastic, this part does not have mechanical or electrical failures. Any issues are purely physical and visual. There are no associated fault codes or dashboard warning lights.
- Cracks and Fractures: The most common issue is physical damage. Dropping heavy or sharp objects into the trunk can easily crack or break the plastic. These cracks often start at the corners or along the thinner edges.
- Warping and Deformation: Exposure to extreme heat or storing heavy objects in the box for long periods can cause it to warp or lose its shape. A warped box may not sit flush in the trunk floor, leading to rattling noises or an uneven surface.
- Stains and Chemical Damage: Spills from liquids like cleaners, oils, or, in a worst-case scenario, leaking batteries can permanently stain or even degrade the plastic material.
- Poor Fitment: If the box is warped or damaged, it may not fit securely in its designated spot. This can cause it to shift and rattle during driving.
Pro Tip: When inspecting the trunk, also check for dampness or water stains underneath where the storage box sits. Some BMW models of this era can experience water leaks into the trunk.
Buying a Used Trunk Floor Storage Box: What to Check
Purchasing a used OEM storage box is a cost-effective solution, as aftermarket versions are generally not available for this specific part. Pay close attention to the following when buying a recycled part:
- Verify Compatibility: This is the most critical step. Ensure the part is from a hybrid G12 7-Series (e.g., 740e, 745e, 750e). The box from a 740i or 750i will not fit. The correct OEM part number is 51477360175 (or the shorter 7360175).
- Inspect for Cracks: Carefully examine the entire box, paying special attention to the corners, edges, and the base. Flex the part slightly to reveal any hairline cracks that may not be immediately visible.
- Check for Flatness: Place the box on a flat surface to check for any warping. It should sit level without any significant rocking or gaps.
- Look for Stains and Residue: Check for any deep stains or chalky residue, which could indicate a past chemical or battery acid spill. This can weaken the plastic over time.
- Confirm All Tabs are Intact: While this part is primarily a drop-in fit, inspect the edges for any small tabs or clips that help secure it in place. Ensure none are broken off.
Known Issues, TSBs, and Recalls
There are no specific recalls or Technical Service Bulletins (TSBs) for the trunk floor storage box itself. However, the vehicle has had recalls and TSBs for related areas that buyers should be aware of:
- Trunk Water Leaks: Some BMWs of this generation have been known to develop water leaks into the luggage compartment. TSBs point to issues like a faulty seal around the fuel filler bowl area as a potential cause. When inspecting a vehicle or the part, check for signs of water damage in the trunk.
- A/C Wiring Harness Recall: A recall was issued for certain 750e xDrive models concerning an air-conditioning wiring harness that could be damaged, potentially causing a short circuit. While not directly related to the storage box, it involves components in the vehicle's body.
- High Voltage Battery Recalls: Some hybrid models were recalled for potential defects within the high-voltage battery cells. This underscores the complexity of the components located beneath the trunk floor.
| Part Type | Estimated Price Range |
|---|---|
| New OEM | $140 - $200 |
| New Aftermarket | Not Available |
| Used OEM | $45 - $100 |
| Shop Labor | $0 - $25 |
Installation Guide
Replacing the trunk floor storage box is extremely simple and requires no tools.
- Difficulty: 1 out of 5
- Time: Less than 5 minutes
- Tools Needed: None
Steps:
- Open the vehicle's trunk.
- Lift up and remove the main carpeted trunk floor panel. This will expose the storage box underneath.
- Simply lift the old storage box straight out of the trunk.
- Clean the area underneath if there is any dirt or debris.
- Place the new storage box into the cavity, ensuring it sits flush and is properly seated.
- Re-install the main carpeted trunk floor panel over the top.
Frequently Asked Questions (FAQ)
Is the trunk storage box for a 750e the same as a regular 750i?
No, they are not interchangeable. The 750e is a plug-in hybrid with a large battery pack under the trunk floor, which changes the shape and size of the available storage space. You must use the specific box designed for the hybrid models (part number 51477360175).
Can a cracked trunk storage box be repaired?
For small cracks, it may be possible to use a strong plastic epoxy or adhesive as a temporary fix. However, given the relatively low cost of a used replacement, swapping the part is the most effective and durable solution.
Why is the trunk floor wet under my storage box?
This is likely due to a water leak, which is a known issue in some BMW models. Common causes include clogged sunroof drains, a bad trunk lid seal, or a faulty seal around the fuel filler area. This issue should be addressed promptly to prevent damage to electronic modules located in the trunk.
Does this part require any programming or special tools to install?
No. This is a simple plastic tray that requires no programming, calibration, or special tools. It is a direct drop-in replacement.
Helpful Videos
Technical Specifications
OEM Part Numbers: 51477360175 7360175
Molded plastic construction, designed specifically for the G12 7-Series plug-in hybrid models.
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.
- BMW 750e xDrive: