Why does my Unreal Enhanced Input axis report a non-zero value at rest?

The default Dead Zone modifier may not be aggressive enough for your gamepad's drift. Increase Lower Threshold from 0.2 to 0.25 or higher, or switch from Axial to Radial deadzone for stick inputs that should treat magnitude as a single value.

What is the difference between Axial and Radial deadzone?

Axial deadzone treats X and Y independently: any axis below threshold is zeroed individually. Radial treats them as a 2D vector: only the magnitude is compared to threshold. Radial preserves diagonal direction better but Axial is simpler for D-pad-like behavior.

How do I expose deadzone settings to the player?

Create a custom Input Modifier that reads from a UGameUserSettings field. The modifier uses the player's chosen value at runtime. Combined with a settings menu UI, this lets players tune deadzone for their controller's drift.

Fix: Unreal Enhanced Input Deadzone Modifier Stuck Axis

Quick answer: Default Dead Zone Lower Threshold (0.2) does not catch all controller drift. Raise to 0.25–0.3 for sticks with drift, switch from Axial to Radial for 2D stick inputs, and consider a custom Input Modifier reading the player’s deadzone preference from settings.

Here is how to fix Unreal Enhanced Input axis values that drift the character even when the player is not touching the gamepad. Stick at rest, character slowly walks. Or the camera spins lazily on its own. The cause is residual hardware noise (stick drift) that sneaks past the default deadzone modifier.

The Symptom

An IA_Move (Vector2) action reads a non-zero value continuously even when no one is touching the controller. The character drifts in one direction. Releasing and re-centering the stick does not fully zero it. Affected players are usually those with older or worn gamepads.

What Causes This

Lower Threshold too low. Default 0.2 catches gentle drift but not the worst-case 0.25–0.3 drift on aging hardware.

Axial vs Radial mismatch. Axial deadzone applies per-axis; a stick with X=0.18 and Y=0.18 yields magnitude 0.25 but neither component is zeroed. Radial would zero based on the 0.25 magnitude.

No deadzone modifier added. Some bindings ship without any modifier. Raw input passes through.

Hard-coded values prevent player tuning. Without a settings exposure, players with bad hardware cannot adjust.

The Fix

Step 1: Add a Radial Dead Zone modifier on Vector2 actions. In the Input Mapping Context, expand the Vector2 binding for IA_Move. Add modifier → Dead Zone. Set:

Type:            Radial
Lower Threshold: 0.20
Upper Threshold: 1.00

Radial preserves diagonal direction; Axial is suitable for digital D-pad-style movement.

Step 2: Raise threshold for problematic platforms. Per-platform overrides via DeviceProfile or runtime detection let you tune higher on platforms that report more drift.

Step 3: Build a custom modifier reading from settings.

UCLASS(meta=(DisplayName="Player Tuned Dead Zone"))
class UInputModifierTunedDeadZone : public UInputModifier
{
    GENERATED_BODY()

protected:
    virtual FInputActionValue ModifyRaw_Implementation(
        const UEnhancedPlayerInput* PlayerInput,
        FInputActionValue CurrentValue,
        float DeltaTime) override
    {
        float threshold = UMyGameUserSettings::Get()->StickDeadzone;
        FVector2D vec = CurrentValue.Get<FVector2D>();
        if (vec.SizeSquared() < threshold * threshold) vec = FVector2D::ZeroVector;
        return FInputActionValue(CurrentValue.GetValueType(), FVector(vec, 0));
    }
};

Players adjust StickDeadzone in the settings menu; the modifier reads it each tick.

Step 4: Add a Smooth Delta modifier for camera sticks. Camera axes benefit from a small smoothing factor to reduce micro-jitter that the deadzone alone does not catch:

Modifiers:
  - Dead Zone (Radial, 0.18)
  - Smooth Delta (factor 0.7)

Step 5: Test with a known-bad controller. Verify on hardware that exhibits drift. If you only test on pristine controllers, you will not catch the worst-case stick drift in your release.

Common Settings Per Game

FPS games: tight deadzone (0.15–0.18) for responsive aim. Driving games: looser deadzone (0.25) so the wheel feels stable. Platformers: medium (0.20) and snap-to-direction post-deadzone for crisp jumps.

“Deadzone tuning is per-game, per-platform, and ideally per-player. Default 0.2 fails worn controllers.”

Related Issues

For gamepad bindings not firing, see Enhanced Input Gamepad. For Anim Blueprint state stalls, see Anim Blueprint State Machine.

Radial deadzone for sticks. Tunable threshold from settings. Smooth Delta for camera. The drift goes quiet.