Pnp0ca0 Jun 2026

To monitor or control the fan speed on a Linux system with an ACPI fan device:

In technical terms, is a "Plug and Play" (PnP) ID that corresponds to the ACPI Root PCI Bus . pnp0ca0

The "pnp0ca0" device might appear on your system for various reasons: To monitor or control the fan speed on

If you see a "Code 43" or "Yellow Triangle" on this device in Device Manager, it often points to a firmware/BIOS bug or a faulty USB-C controller. It sits silently under the category in Device

Under normal circumstances, you won't even notice PNP0CA0. It sits silently under the category in Device Manager, often labeled as "PCI Bus." However, it becomes a focal point for users when:

If the device shows a "Code 43" in Windows or "failed to read PPM" in Linux, try these steps: Update BIOS/Firmware : UCSI is heavily dependent on the firmware's ACPI implementation