Hi @Prasad09, sorry to hear about this.
Have the vibration just stopped working on your phone or has it not been working for a long time? Also, have you been able to carry out a quick test of the vibration int the support app to see if the hardware works as intended? Find and tap Settings > Support > Xperia Tests > Vibration.
Another thing that you can try is to reboot your phone in safe mode to see if the vibration works better there. All apps downloaded from Play Store is temporarily deactivated while in safe mode and by doing this, you can see if this behaviour is caused by a downloaded app. For more information on safe mode and how to use it, click here.
If the lack of vibration persists in safe mode, I would suggest that you try to repair the software on the phone using Xperia Companion and a computer. Keep in mind though that all user data will be erased by the repair, so it is advised to do a backup before to avoid data loss.
Try these measures and feel free to let me know how it goes!
