PlayStation Error SU-42118-6 — What It Means & How to Fix It

What Does This Error Mean?

SU-42118-6 means a PlayStation system software update failed to install. This code appears when the console tried to update its operating system but the update could not complete. Possible causes include a corrupted update file, insufficient storage space, a hard drive error, or a network interruption during download. This needs to be resolved — running outdated system software can eventually prevent you from using PSN.

Affected Models

PlayStation 4
PlayStation 4 Slim
PlayStation 4 Pro
PlayStation 5

Common Causes

The system update file was corrupted during download
The console does not have enough free storage space to download and install the update
The hard drive or SSD inside the console has a file system error preventing the installation
The download was interrupted by a network issue or the console going into rest mode unexpectedly
A deeper system software corruption requires reinstalling the full system software

How to Fix It

Delete the failed update file. Go to Notifications on the main screen, find the failed system update, and delete it. You need to remove the corrupted partial file before attempting again.

Retrying without deleting the corrupt file will almost always fail again with the same error.
Check available storage. Go to Settings > Storage > System Storage > Applications (or System). You need at least 1.5x the update file size free. If storage is low, delete games or video content to make room.

System updates on PlayStation 4 typically require 1–5 GB of free space. Make sure you have at least 8–10 GB free for updates to install reliably.
Try updating again via Settings > System Software Update. Use a stable internet connection — wired Ethernet is more reliable than Wi-Fi for system updates.

Start the update when you do not need the console for a few hours. System updates can take 30–90 minutes on a moderate connection.
If the download fails again, try updating via a USB drive. Download the system update file from PlayStation's website (playstation.com/en-us/support/hardware/ps4/system-software/) on a computer, copy it to a USB drive, and install it via Safe Mode.

In Safe Mode (hold power button for 7 seconds), select 'Update System Software' > 'Update from USB Storage Device'. This bypasses network download entirely.
If SU-42118-6 persists even with USB installation, the console's storage may have a file system error. In Safe Mode, select 'Initialize PS4' to perform a factory reset. This deletes all data but usually resolves persistent update failures.

Back up your save data to PlayStation Plus cloud storage or a USB drive before initializing. Initialization is a last resort but is highly effective at resolving system software issues.

When to Call a Professional

SU-42118-6 is almost always user-fixable. No repair costs are typical. If the hard drive has failed and is causing repeated update failures, drive replacement costs $40–$80 on PS4. Contact PlayStation Support at playstation.com/support for additional help.

Frequently Asked Questions

Do I have to install every PlayStation system update?

Eventually, yes. Sony requires the console to run current system software to access PSN. Outdated system software will eventually block you from signing in to PSN, playing online games, and using the PlayStation Store. System updates also include security patches and performance improvements. Install them promptly.

Will initializing my PS4 delete my game saves?

Yes — a full initialization (factory reset) deletes everything on the console, including game saves. Before initializing, upload your saves to PlayStation Plus cloud storage (if you are a PS Plus subscriber) or copy them to a USB drive via Settings > Application Saved Data Management. Game licenses are tied to your account, not the console, so you can re-download purchased games after the reset.

How do I download the PS4 system update to a USB drive?

Format a USB drive to FAT32 or exFAT. Create a folder called PS4, and inside it create a folder called UPDATE. Download the full system reinstall file (not the update file) from playstation.com — look for 'Reinstall System Software' on the support page. The file should be named PS4UPDATE.PUP. Place it in the UPDATE folder. Insert the USB into the PS4 in Safe Mode and select Update System Software.