Hey @TYTISS,
You can try:
1. r_interior command
Enable the console (if not already):
Set in config.cfg:
uset g_console "1"
uset g_developer "1"
Open the console ingame and then type r_interior 1
2. Clear shader & cache folders
Go to:
Documents/Euro Truck Simulator 2/
Delete:
cache
shader_cache
I hope this will fix your problem.
Best regards,
Pasi