---
title: IOUSBFamily hardware error codes
framework: IOKit
role: collectionGroup
role_heading: API Collection
path: iokit/usb_h_user-space/iousbfamily_hardware_error_codes
---

# IOUSBFamily hardware error codes

## Topics

### Constants

- [kIOUSBBitstufErr](iokit/kiousbbitstuferr.md)
- [kIOUSBBufferOverrunErr](iokit/kiousbbufferoverrunerr.md)
- [kIOUSBBufferUnderrunErr](iokit/kiousbbufferunderrunerr.md)
- [kIOUSBCRCErr](iokit/kiousbcrcerr.md)
- [kIOUSBDataToggleErr](iokit/kiousbdatatoggleerr.md)
- [kIOUSBLinkErr](iokit/kiousblinkerr.md)
- [kIOUSBNotSent1Err](iokit/kiousbnotsent1err.md)
- [kIOUSBNotSent2Err](iokit/kiousbnotsent2err.md)
- [kIOUSBPIDCheckErr](iokit/kiousbpidcheckerr.md)
- [kIOUSBReserved1Err](iokit/kiousbreserved1err.md)
- [kIOUSBReserved2Err](iokit/kiousbreserved2err.md)
- [kIOUSBWrongPIDErr](iokit/kiousbwrongpiderr.md)