Hello,
I am working for a game and they wanted me to fix a vehicle system. However, the vehicle system fails on this line
Collision group does not exist.
Even though the line is this:
local PS = game:GetService("PhysicsService")
PS:SetPartCollisionGroup(script.Parent.Parent.RL.Wheel,"CarWheels")
I am fairly new to this stuff and I am unsure why it is outputting this. Does anybody have any ideas?
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Try check during game testing if collision group actually exist, and what ID it have.
I am confused, what do you mean by ID? I play tested in both studio and game and it returns that output and nothing else.
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Collision Groups have their own ID. For example:

Here, “Default” have CollisionGroupID = 0, and “Blocks” have CollisionGroupID = 1.
You can use this ID’s for setting part’s collision group.
But the problem is it’s saying there is no collision group even though its being assigned on this line:
PS:SetPartCollisionGroup(script.Parent.Parent.RL.Wheel,"CarWheels")
And its outputting no collision group. What’s even weirder is this works exactly correct on another game, but not the one I am currently on.
Try look at CollisionGroups during game test → Is that collision group ever existing?
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Nope. The collision group is never existing.
Alright, I set the collision groups and now it works. Thanks!
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