PNP0500 identifies a standard PC COM port, while PNP0501 is for a “16550A‑compatible COM port”. The difference is in the supported features (e.g., larger FIFO buffers). Many systems enumerate one or both, depending on the chipset emulation.
Download the latest or Intel AMT / ME (Management Engine) Driver . Install the package and reboot your system. Troubleshooting Common PNP0500 Errors after Updating pnp0500 driver updated
Windows includes a built-in architecture driver ( serial.sys ) specifically designed to run this hardware automatically without requiring third-party software. Common Reasons to Update the PNP0500 Driver PNP0500 identifies a standard PC COM port, while
Serial port drivers are low-risk but also low-reward. Consider these guidelines: Download the latest or Intel AMT / ME
Navigate to , Peripherals , or Super I/O Configuration . Locate Serial Port (COM1/COM A) .
If your PNP0500 entry appeared after plugging in a USB-to-Serial adapter cable, you cannot rely on generic Windows drivers. These cables use specific emulation chips that require dedicated software.
Check if any serial port or motherboard driver updates are available. Method 2: Update Driver via Device Manager