Destiny 2 is a free-to-play first-person shooter developed by Bungie, released on PlayStation 4, Xbox One, and PC. You explore the solar system and its mysteries with your own Guardian that you customize and have unique weapons & gear for. The game has a cinematic story with co-op missions and different PvP Multiplayer modes.
Destiny 2 Error Code LETTUCE is an error that many players experience sometimes. According to Bungie, the developers, this error and similar ones are caused because of interruptions between the client & host, which could be due to issues with the ISP, packet loss, WiFi issues, or other complications.
Thankfully, there are solutions and workarounds to this error. Try all the solutions listed below and hopefully, you’ll be able to solve the error code.
Solution 1: Restart network systems and make sure nothing is wrong with your internet
The most probable cause of this issue is networking issues on the player’s side, meaning the player is not able to connect to the game servers properly. Naturally, the best way to resolve this is to troubleshoot your internet connection first and make sure it’s working. See if you can access the internet by using Chrome (or whatever browser you use) on the platform that you’re using to play the game.
Restart your network connection. To do this, go to your WiFi router or networking device that you’re using. Turn it off completely and unplug it from the power source. Wait for three minutes (it’s not really required, but a forum member said it’s good practice to do so). Start the network systems again and make sure you have good internet connectivity.
If you’re on PC, make sure Windows Firewall isn’t blocking Destiny 2 in its settings too. To do this, go to the ‘Firewall & network protection’ page of Windows Security in Windows 10 OS. Select ‘Allow an app through firewall’ in this menu. You’ll get a list of many apps – scroll down and find where Apex Legends is, and then make sure there’s a tickmark for both Public & Private networks. Apply the changes.

Solution 2: Restart your game and your gaming console or PC
This fix was found on Reddit, where a user was getting the Destiny 2 Error Code LETTUCE constantly and the game wasn’t able to contact Destiny servers. The player suspected the router was being overburdened and sometimes wasn’t able to access the router’s settings page. The fix for him was to restart the game twice and also restart his PC. After he was able to access the router settings page just fine, the game also worked well.
Restart your game by exiting it completely, turning off your PC or gaming console, and then start everything up again. Do the first solution as well when you’re doing this, which is to restart your network connection completely.

Solution 3: Try Bungie’s network troubleshooting guide
Bungie has a network troubleshooting guide for all the platforms Destiny 2 is on. The guide helps you to fix many issues and helps you with advanced troubleshooting for issues related to UPnP, Port Forwarding, NAT Types, and Packet Loss.
Bungie’s official network troubleshooting guide
I hope this guide was able to fix Destiny 2’s Error Code LETTUCE for you.