2017-2022 Genesis G90 Trunk Fuse Box: Solving Parasitic Drains and Electrical Gremlins
This guide covers the rear-mounted fuse and relay box in the 2017-2022 Genesis G90, focusing on part number compatibility, diagnosing electrical issues, and why a used OEM unit is a smart choice.
- This article is for the TRUNK fuse box only, not the fuse boxes under the hood or dash.
- No programming is required for replacement, making a used OEM part an excellent, cost-effective solution.
- There are two different part numbers: 91950-D2310 for 2017-2019 models and 91950-D2740 for 2020-2022 models. You must match the part number.
- The most common symptom of failure is a parasitic battery drain, but proper diagnosis is needed to rule out other causes.
Identifying the Correct Fuse Box: It's in the Trunk
The Genesis G90 has multiple fuse boxes. This guide is specifically for the main fuse and relay box located in the trunk area, often called the rear junction block. It is NOT about the fuse box in the engine bay or the smaller one inside the cabin under the dashboard. Many electrical issues, particularly parasitic battery drains or problems with rear-mounted accessories, trace back to this specific unit.
Warning: Part numbers for the under-dash fuse box (e.g., 91950-D2230, 91950-D2711) look similar but are completely different parts. Before purchasing, confirm you are ordering the rear trunk-mounted unit.
Known Issues and Symptoms of Failure
A failing rear junction block often creates confusing electrical problems. Because it supplies power to many different systems, symptoms can appear unrelated.
Common Symptoms:
- Parasitic Battery Drain: This is the most common and frustrating symptom. An internal short or a stuck relay inside the fuse box can cause a constant power draw that drains the battery overnight or after a few days of sitting.
- Multiple Unrelated Electrical Failures: You might notice that the fuel pump, power trunk, rear power seats, and audio system stop working intermittently or all at once. If multiple circuits fail simultaneously, the common link is often the fuse box that powers them.
- No-Start Condition: If the fuse or relay for the fuel pump is located in this box, a failure can prevent the engine from starting.
- Visible Damage: In some cases, you may see or smell burnt plastic, or find corrosion around the terminals from water intrusion.
Pro Tip: A parasitic drain doesn't always mean the fuse box is bad. A faulty component, like an audio amplifier, can fail to shut down and cause a drain. A technician can diagnose this by measuring the current draw at the battery and pulling fuses one by one to see which circuit is causing the drain.
Associated OBD-II Codes
A failing fuse box itself typically does not generate a specific trouble code. Instead, you will likely see codes related to the components that have lost power or are malfunctioning due to erratic voltage. For example, you might see communication loss codes for various modules or low voltage codes for specific sensors powered by the box.
Part Number Compatibility and Year Splits
Matching the part number is critical when buying a replacement. Genesis changed the part mid-generation, coinciding with the 2020 model year facelift.
| Vehicle Years | Known OEM Part Number | Notes |
|---|---|---|
| 2017-2019 | 91950-D2310 | Fits pre-facelift models. |
| 2020-2022 | 91950-D2740 | Fits facelifted models. Some parts sites mislabel this as an "instrument panel" box, but it is the correct rear unit for these years. |
Important: Always verify the part number on your original fuse box before ordering a replacement. While these are the most common numbers, variations can exist based on trim level or specific options.
Buying a Used Fuse Box: A Smart, Simple Fix
This is one area where a used OEM part is an excellent choice. Here’s why:
- No Programming Required: The trunk junction block is a non-intelligent, "dumb" part. It does not need to be programmed, flashed, or coded to the vehicle. Replacement is a direct plug-and-play swap.
- Availability and Value: Since no major aftermarket companies produce this part, your only options are new OEM or used OEM. A used unit provides identical factory performance for a fraction of the price of a new one from the dealer.
- What to Inspect: When buying used, check the photos for any signs of melting plastic around the fuse and relay sockets. Ensure all connector pins are straight and free of corrosion. A part from a low-mileage, collision-damaged vehicle is an ideal donor.
Cost of Replacement
The cost to replace the G90 trunk fuse box varies significantly between new and used options.
| Part Source | Estimated Cost |
|---|---|
| New OEM (Dealer) | $550 - $850 |
| Used OEM (Recycled) | $100 - $200 |
| New Aftermarket | Not Available |
| Shop Labor | $120 - $180 |
Labor costs are estimated based on a national average labor rate of $120-$160/hour and an estimated 1-1.5 hours of work.
DIY Replacement Feasibility
Replacing this fuse box is a straightforward job for a DIY mechanic with basic tools. The process generally involves:
- Disconnect the battery. This is the most important safety step.
- Access the fuse box by removing trunk trim panels.
- Carefully unplug all electrical connectors. Most have a locking tab that must be depressed.
- Unbolt the fuse box from the vehicle chassis.
- Install the new box and reconnect everything in reverse order.
Frequently Asked Questions (FAQ)
Do I need to program a replacement Genesis G90 trunk fuse box?
No. The rear junction block is a non-programmed part. A used or new replacement will work immediately after installation without any dealer software or special tools.
Is this the same as the fuse box under the hood?
No. This guide is for the fuse and relay center located in the trunk. The Genesis G90 has at least two other fuse boxes, one in the engine bay and one in the driver's side dash area.
My battery keeps dying. Is the fuse box definitely the problem?
Not necessarily. While a faulty fuse box can cause a parasitic drain, so can a bad battery, a failing alternator, or another component that isn't shutting off correctly, like the radio amplifier. Proper diagnosis is key before replacing parts.
Can I use a fuse box from a 2017 G90 in my 2021 G90?
No. The part numbers are different between the 2017-2019 and 2020-2022 models. You must use a fuse box with the exact same part number as the one you are replacing to ensure compatibility.
Technical Specifications
OEM Part Numbers: 91950-D2310 91950D2310 91950-D2740 91950D2740
Houses various blade-type and cartridge fuses and relays. Direct power distribution from the vehicle's main battery.
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.
- Genesis G90:
- 🛍️ Shop This Part
- Identifying the Correct Fuse Box: It's in the Trunk
- Known Issues and Symptoms of Failure
- Common Symptoms:
- Associated OBD-II Codes
- Part Number Compatibility and Year Splits
- Buying a Used Fuse Box: A Smart, Simple Fix
- Cost of Replacement
- DIY Replacement Feasibility
- Frequently Asked Questions (FAQ)
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