Where do I start the Fault Hunting quest in Borderlands 4?

You can start the Fault Hunting side quest in Carcadia Burn by interacting with the 'Urgent' wall transponder outside the generator room.

What is the solution to the Fault Hunting power puzzle in BL4?

Rotate the closest cable to the power cell once, the middle cable twice, and the one nearest to the console three times to redirect power.

Who is the boss in the Borderlands 4 Fault Hunting quest?

The Fault Hunting quest ends with a boss fight against Genone, the first sentient Synth created by Zadra.

Borderlands 4 Fault Hunting Quest Walkthrough – Puzzle Solution & How to Beat Genone

The Fault Hunting side quest in Borderlands 4 is one of the most engaging missions in Carcadia Burn, blending exploration, puzzles, and a climactic boss fight against a powerful Synth named Genone.

You’ll pick it up from a wall transponder labeled Urgent outside the generator room in the faction town. The quest begins with a strange call from Leopol, a seismologist convinced that something beneath the ground is causing dangerous tremors. What starts off sounding like paranoia soon turns into a thrilling mission.

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Here’s a step-by-step BL4 Fault Hunting walkthrough including all puzzle solutions and the boss fight.

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Step 1: Talk to Leopol

After hearing his message, head to Leopol in Carcadia Burn. He’ll explain that the tremors are not from the monfall, but from something else entirely. He sends you to investigate.

Step 2: Explore the Cave

Travel to the cave marked on your map. Inside, you’ll encounter a blocked door and a group of enemies. Clear the ambush and use the jet geyser to climb onto a ledge that leads around the blocked path and deeper into the facility.

Step 3: Explore the Facility

Inside the facility:

Fight off more enemies.
Destroy a power cell to open a malfunctioning door.
Continue progressing until you reach the server room.

Step 4: Direct Power to the Server Console

To unlock the console, you’ll need to solve a power redirection puzzle using ceiling cables and grapples. Rotate them as follows:

Closest cable to the power cell → rotate once.
Middle cable → rotate twice.
Cable closest to the console → rotate three times.

This redirects power correctly and activates the server.

Step 5: Hack into the Console

While ECHO-4 hacks the server, waves of enemies will attack. Hold them off until the hack finishes.

You’ll then see a hologram of Zadra describing the creation of the Synths, including their first prototype—Genone. Shortly after, Genone acknowledges you and sends its coordinates for a fight.

Step 6: Reach Genone

Exit the cave and head to the Yawning Yard in Lopside, Carcadia Burn. Drop into a hidden cave where Genone unlocks the door for you.

Inside, expect:

More enemy encounters.
Another server room full of foes.
A second power redirection puzzle to open the next door (similar to the earlier one, but with more cables).

Step 7: Fight Genone & Shut Down the Facility

With the door unlocked, prepare for the Genone boss battle:

Restock ammo before dropping into the arena.
Defeat Genone and ensure Zadra’s Synth research is deleted.
Pick up the keycard to access the control room.
Interact with the console to shut down facility power.

Finally, don’t forget to loot the reward chest after the fight for extra XP, Eridium, cash, and a weapon paint.

Rewards for Completing Fault Hunting

XP
Eridium
Cash
Unlockable weapon paint