Pnp0ca0

Microsoft’s in-box driver ( UcmUcsiAcpiClient.sys ) depends directly on ACPI methods provided by your computer manufacturer's firmware.

If using a desktop, flip the physical power switch on the back of the power supply unit (PSU).

For the end user, PNP0CA0 is invisible—until it isn’t. In Linux, the command dmesg | grep -i pnp0ca0 might yield a message like: pnp0ca0

Have you ever dug into on Windows and spotted a device with a hardware ID like PNP0CA0 ? You’re not alone — and no, it’s not a random code glitch.

If this device node functions incorrectly, your USB-C ports lose their "smart" features and may revert to standard, low-power data ports. The PNP0CA0 node controls: Microsoft’s in-box driver ( UcmUcsiAcpiClient

In most modern computer architectures, the device presents itself under these specific hardware strings: ACPI\VEN_USB&DEV_C000 ACPI\USBC000 *PNP0CA0

The identifier is a specific hardware ID associated with the USB Type-C Connector System Software Interface (UCSI) driver. This component is essential for managing the advanced features of modern USB-C ports, including power delivery and data role switching. What is the PNP0CA0 Device? In Linux, the command dmesg | grep -i

The most frequent issue associated with PNP0CA0 is the "Unknown Device" error. This happens when the OS sees the hardware but doesn't have the specific instruction set to manage it. When this occurs, you may notice: Slow system performance. USB ports or PCIe slots not functioning at full speed.

Restart your computer. Windows should automatically reinstall the driver upon rebooting.