2025 Toyota Gr Corolla

Driving my car normally when, at around 3,800 miles, my car threw a CEL and went into limp mode, while in traffic. I had to pull over safely, immediately shut off vehicle and have it towed to the dealership for diagnostic & repair. The code was the infamous P2C90 Crankcase ventilation leak check engine light code. This has happened over the course of 14k miles, 4+ more times. Each time, the CEL turns on and disables: cruise control, lane assist, blind spot assist, AWD (limp mode) and directly affects driving. I have taken the vehicle back to the same dealer for the same instance 3 recurring times, and I am now pursuing the "final repair" request under Florida Lemon Law. Furthermore, the dealer has stated they don't know why this issue arises, and they send notification Toyota Corporate on guidance for this common issue among GR Corollas. I have also received numerous TSB ECU updates in hopes to "solve" this issue but nonetheless the P2C90 code has been persistent in coming back in my brand new vehicle.

Hello, Today (01/21/2026), on my 2025 Toyota GR Corolla vehicle (odometer 5243 miles), after 3200 miles of driving with the updated engine control unit (ECU) as of 10/14/2025 according to the T-SB-0071-25, a P2C90 error appeared again with an Check Engine Light. This happened during acceleration while entering the highway, when the engine speed reached between 3000 and 4000 RPM. This situation disables many of the vehicle's active safety systems (all-wheel drive, vehicle stability control, traction control, adaptive cruise control, lane keeping assist, etc.), exposing owners to unwarranted safety risks due to unexplained fluctuations in the crankcase ventilation monitoring system of a new and otherwise healthy engine. How can we get Toyota to release a better ECU firmware update to fix this problem? Obviously, the previous fix was not effective enough. Regards!