# Successive Haptic pulses stop working after a few seconds **URL:** \ **Category:** XR Development\ **Tags:** SteamVR, unreal-engine, question\ **Created:** [April 20, 2021, 10:07am UTC](https://forums.unrealengine.com/t/successive-haptic-pulses-stop-working-after-a-few-seconds/482199 "2021-04-20T10:07:38Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![RC-1290](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/rc-1290/32/261500_2.png) [@RC-1290](https://forums.unrealengine.com/u/RC-1290)\ **Post date:** [April 20, 2021, 10:07am UTC](https://forums.unrealengine.com/t/successive-haptic-pulses-stop-working-after-a-few-seconds/482199/1 "2021-04-20T10:07:38Z")
Follow up on UE-33361 ([Issue Link](https://issues.unrealengine.com/issue/UE-33361)) PlayHapticEffect stops having an effect if a short one is triggered multiple times in a row. I suspect “short” is less than deltatime. Instead I would expect the haptic pulse to either work, or not at all. Opening the Steam VR system menu and hovering over the buttons (which have haptic effects) re-enables haptics, but the issue re-occurs after about the same time. PlaySteamVRHapticFeedback does not have this issue, but it can reproduce the issue by calling it again later with an amplitude of 0; it will trigger the haptics a couple of times, until it stops. Just like with PlayHapticEffect. The TriggerHapticVibrationAction function used with SteamVR has a duration parameter, which unreal fills with delta-time, so it can update the data next frame. For short pulses this next frame has an amplitude of 0. I think in the case of SteamVR unreal should skip that closing call to TriggerHapticVibrationAction. Neither [Unreal documentation](https://docs.unrealengine.com/en-US/BlueprintAPI/SteamVRInput/PlaySteamVRHapticFeedback/index.html), nor [SteamVR Documentation](https://github.com/ValveSoftware/openvr/wiki/SteamVR-Input) notes any limitation like this, though the duration setting does imply usage, which leads me to believe this is an issue on Unreal’s side. Tested with: - Version: 4.26.1-0+++UE4+Release-4.26 - SteamVR - Valve Index Controllers