iRacing 2026 S2 Patch 4 Hotfix 1 update

We’ve got a small iRacing hotfix to track here. According to the official release notes, this update focuses on targeted fixes across core systems, vehicles, and tracks.

What changed

Race control and session systems

• Fixed an issue where Open Qualifying could incorrectly display a race setup.
• Fixed a problem where caution laps completed under green could be counted incorrectly.

AI

• Fixed a bug where AI drivers could fail to use a team’s chosen paint pattern and color when all AI drivers were using custom paints.

Graphics and rendering

• Fixed an issue where some shaders could fail to preload correctly.
• Fixed a problem with mirrored track surfaces not rendering correctly in some cases.

Tires

• Dirt tires received a fix for a surface temperature issue.

Cars

• Dallara IR18: fixed an issue where bodywork damage from wall scrapes could appear detached.
• Ferrari 296 Challenge: fixed a visual issue where the vehicle number could disappear.
• Lotus 79: fixed an issue where some dashboard switches could disappear.
• NASCAR Cup Series Gen 7 Chevrolet Camaro ZL1: fixed an issue where the splitter could appear mirrored.

Tracks

• Autodromo Internazionale del Mugello: fixed a rendering issue where some trackside buildings could appear partially transparent.
• Kansas Speedway: fixed an issue where some walls could appear mirrored.
• Kern County Raceway Park: fixed an issue where some tire barriers could appear mirrored.
• Knockhill Racing Circuit: fixed an issue where some wall segments could appear mirrored.

For our league ops, we should recheck caution behavior, open qualifying presets, and any upcoming events using dirt content or the listed car/track combinations.