Car is not steering when it's on first gear

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1

Hi guys, I am working on a car system
But I am having a trouble.
When the vehicle gear(or speed) it’s at 1 (first gear)
Car seems like it doesnt collides with groud, like if the wheels do not affect ground.

This is the code for steering;

local function Steer()
	if (Variables.Keys.D) then
		if (not Variables.completedSteering) then
			car.Constraints.SteeringPrismatic.TargetPosition = -1
			Variables.completedSteering = true
			return
			end
	end
	if (Variables.Keys.A) then
		if (not Variables.completedSteering) then
			car.Constraints.SteeringPrismatic.TargetPosition = 1
			
			Variables.completedSteering = true
			return
		end
	end
	if (not Variables.Keys.D and not Variables.Keys.A) then
		Variables.completedSteering = false
		car.Constraints.SteeringPrismatic.TargetPosition = 0
	end
	Variables.completedSteering = false
end

Video of bug:

Pay attention to the number in GUI, it’s the current gear!!