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Borderlands 4
Fault Hunting Walkthrough
☆ How Rush Saved Mercenary Day (Bounty Pack 1)
★ 12 active SHiFT Codes as of December 4, 2025
☆ Black Market Location
★ Elemental Weakness Chart
☆ Legendary Weapons
★ Builds: Vex | Amon | Rafa | Harlowe
This is a walkthrough for the Fault Hunting side mission in Borderlands 4. Read on to follow the objectives and clear the mission.
List of Contents
How to Unlock Fault Hunting
There are two ways to start the Fault Hunting side mission, though both ways are still fixed to the Ruined Sumplands area and follow the same progression.
Both ways require you to have initiated the Wrath of the Ripper Queen main questline.
Talk to Leopold at the Society for Amateur Seismology Enthusiasts
You may start Fault Hunting by directly talking to Leopold at the Society for Amateur Seismology Enthusiasts on the western side of the Ruined Sumplands.
Accept Mission at Carcadia
The second way of starting Fault Hunting is after restoring Carcadia in the first part of the Unpaid Tab main mission.
Talk to Leopold at an intercom to accept the mission. You will have to talk directly to Leopold anyway at the Society for Amateur Seismology Enthusiasts.
Fault Hunting Walkthrough
Find the Source of the Tremor
| # | Walkthrough |
|---|---|
| 1 | Talk to Leopold at the Society for Amateur Seismology Enthusiasts. |
| 2 |  Travel northeast to reach the tremor site. Inside the cave, glide toward the geyser to get a boost and land on the other side. |
| 3 |  Keep going until you reach a locked door. Kill the creeps. Optionally, you may search the area by picking up the blue item near the door and examining the door itself. |
| 4 |  With the door still locked, look around for a geyser and jump toward it to land on an upper portion of the cave. Crouch past a tight passage and drop down into the next area. |
Explore the Facility
| # | Walkthrough |
|---|---|
| 1 |  Ahead, you will be blocked by a door that keeps opening and closing. Through the gap in the door, shoot the green fuse. Move along and fight creeps before dropping down another hole. |
| 2 |  At the server room, find the server console. You may optionally search the room by examining the mummified creeps on the floor. |
| 3 | Find the power source slightly to the right of the console. |
| 4 |
  Direct power to the server console by using the grappling hook to turn the wires on the ceiling. Then, hack the server console. |
| 5 | While ECHO-4 is hacking the console, defend it by killing the creeps advancing toward it. |
Confront Genone
| # | Walkthrough |
|---|---|
| 1 | Leave the server room by going through the door to the right of the power source. Following the path will lead you back to the entrance of the cave. |
| 2 |  Go to Lopside, south of Carcadia Burn. You may immediately go there if the Makeshift Chalet Safehouse has already been captured. |
| 3 |  Arriving at The Yawning Yard, go to the edge of a cliff and glide down to find a door, which will open for you. |
| 4 |  Kill creeps on the way to Genone. Eventually, you will find yourself in a room with synth prototypes. After killing them all, activate the console by a door. |
| 5 |    Like in the server room, direct power to the door to unlock it. |
| 6 |  After passing through a series of rooms, confront the boss Genone. |
| 7 |  Find the control room keycard on a terminal at the center of the arena. Use the keycard to gain access to the control room. Inside, turn the switch to delete Zadra's research and end the mission. |
Fault Hunting Rewards
| Side Mission Rewards | |
|---|---|
| Base Reward |
・Cash ・XP ・Eridium |
| Equipment Reward | ・Assault Rifle (Green to Purple Rarity) |
| Cosmetic Reward | ・Eternal Defender (Weapon Skin) |
Borderlands 4 Related Guides
List of Side Missions
Comment
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Fault Hunting Walkthrough
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