Genesis G80 & GV80 Engine Fuse Box Guide (2018-2025): Fire Recalls, Part Numbers & Diagnosis

Important: Two Generations, Two Different Fuse Boxes

This guide covers two distinct vehicle platforms and their corresponding engine fuse boxes. The parts are NOT interchangeable between these generations.

• 2021-2025 Genesis G80 (RG3) & 2021-2025 Genesis GV80 (JX1): These vehicles are built on a shared platform and use the same modern engines and fuse box design.
• 2018-2020 Genesis G80 (DH): This earlier generation has a different platform, different engines, and a different fuse box. This model is subject to critical fire-risk recalls involving the electrical system.

Always verify your vehicle's model year before purchasing a replacement part.

Part 1: 2021-2025 Genesis G80 & GV80 (2.5T, 3.5T) Engine Fuse Box

The engine bay fuse box on the second-generation G80 (RG3) and first-generation GV80 (JX1) is a single, integrated unit often called a "PCB Block Assembly." It is located in the engine compartment, typically on the passenger side.

Known Part Numbers

• 91959-T1100

Known Issues and Related Problems

While there are no widespread recalls specifically for the fuse box on these models, they can still fail from moisture, corrosion, or internal shorts. 🎬 Watch: One owner's experience with Genesis electrical issues and service. Additionally, other electrical issues can mimic fuse box failure.

• Fuel Pump Failure Recall (NHTSA 23V630000): A recall was issued for a faulty fuel pump in certain 2021-2022 G80 and GV80 models, which can cause a loss of drive power. Symptoms could be mistaken for a bad fuel pump relay within the fuse box.
• Battery Drain TSBs: Genesis has issued technical service bulletins (TSBs) related to battery drain while the vehicle is off. While often software-related, a faulty relay within the fuse box could also be a cause.
🎬 See how to jump start and access a dead battery.

Part 2: 2018-2020 Genesis G80 (3.8L, 3.3T, 5.0L) Engine Fuse Box

The first-generation G80 (DH) uses a different engine fuse box and is subject to two major safety recalls that involve the vehicle's electrical system and can lead to an engine compartment fire.

Known Part Numbers

• 91226-B1370 (Often sold as part of a larger front wiring assembly)

CRITICAL SAFETY RECALLS

Recall: ABS Module Fire Risk (NHTSA 21V-160)

A defect in the Anti-Lock Brake System (ABS) module can cause it to short circuit internally over time. This can lead to an engine compartment fire while driving or parked. Warning signs include smoke, a burning or melting odor, or an illuminated check engine light. The official remedy from Genesis involves dealers installing a new, lower-amperage fuse for the ABS module circuit to prevent overcurrent.

Recall: Starter Solenoid Fire Risk (NHTSA 24V107000)

Water can enter the starter solenoid, leading to an electrical short. This can cause an engine compartment fire. The remedy involves the dealer installing a relay kit in the engine junction box to prevent the solenoid from being continuously powered.

Compatibility Warning

The initial data for this part specified fitment for 3.8L RWD models only. It is critical to match the part number from your original fuse box exactly, as different options (engine, drivetrain, park assist, fog lamps) may require a different fuse box configuration.

Symptoms of a Failing Fuse Box

• Multiple Unrelated Electrical Failures: When several different systems stop working at once (e.g., headlights, radio, and power windows), it often points to the fuse box rather than individual components.
• Intermittent Problems: Components that work one moment and fail the next can be a sign of a loose connection or failing relay inside the fuse box.
• Engine Won't Start or Stalls: A bad main relay or fuel pump relay, which are often integrated into the fuse box, can prevent the engine from starting or cause it to shut off unexpectedly.
• Visible Damage: Obvious signs include melted plastic around fuse or relay sockets, green or white crusty corrosion on the terminals, or signs of water intrusion under the cover.
• Repeatedly Blowing Fuses: If a specific fuse blows immediately after being replaced, it indicates a short circuit. If multiple different fuses blow, the fuse box itself may have an internal short.
• Burning Smell: A plastic or electrical burning smell from the engine bay or under the dash is a serious sign of overheating and a potential fire hazard.

Buying a Used Fuse Box: What to Look For

A used OEM fuse box can be a reliable and cost-effective solution, as these units are generally durable. Aftermarket versions are rare and not recommended due to potential quality and compatibility issues.

1. Match the Part Number EXACTLY: This is the most important step. Different trim levels, engines, and options require different internal wiring. Using the wrong part number will lead to features not working. Find the number on the sticker of your original part.
2. Verify the Vehicle Generation: Ensure the donor vehicle is from the same generation as yours (2018-2020 G80 vs. 2021+ G80/GV80).
3. Perform a Thorough Physical Inspection:
   • Check all fuse and relay sockets for signs of melting, blackening, or heat damage.
   • Look for any white or green powder (corrosion) on the terminals, both on top and on the connectors underneath. Avoid any unit with signs of corrosion.
   • Ensure the plastic housing is not cracked or broken, which could allow future water entry.
   • Ask the seller if the vehicle it came from had any flood or fire damage. Never buy a part from a flood-damaged car.
4. Confirm No Programming is Needed: The engine bay fuse box for these models is plug-and-play. This makes a used part an excellent value, as no dealer visit is required for installation.

Cost Comparison

Frequently Asked Questions (FAQ)