Hello @LoveThatM8 ,Welcome to the forums!
From what you’ve described, this seems like a pretty unusual issue.
My first recommendation would be to follow the official documentation and recreate the vehicle from scratch to compare the configuration. However, if the exact same vehicle works correctly in another project using the same settings, then it’s unlikely that the issue is with the vehicle setup itself. Even so, it’s still worth going through the official documentation to make sure no configuration detail was overlooked. It may also be worth verifying that the mesh and the Geometry Collections were imported correctly. I’ll also leave you a video showing the import and set up process, as comparing it with your setup might help rule out any differences.
Another thing I’d check is whether the wheels or the chassis are slightly overlapping or positioned too close to each other. If there’s any initial overlap when the simulation starts, it can generate a very strong collision that causes the vehicle to “explode” or the wheels to detach immediately.
I’d also try spawning the vehicle a few meters above the ground to rule out any initial overlap with the terrain.
Since you mentioned that the issue starts when you move the vehicle into a world made of Procedural Meshes, it could also be related to the collision settings of those meshes. As a test, try setting the Collision Type of the Procedural Mesh Component to Use Complex Collision As Simple and see if that changes the behavior.
Finally, I’ll leave you a few posts from other users who experienced similar issues. They might help you identify the cause or at least provide some useful ideas for further troubleshooting.
Lastly, I’d also recommend taking a look at this post. It discusses several different Chaos Modular Vehicle setting examples
Hope it helps!