Exynos Usb | Device4000 Hot

Deep Dive: Exynos USB Device 4000 Overheating Phenomenon

What is "USB Device4000"?

Despite the name, "USB Device4000" usually does not refer to a flash drive or peripheral you have plugged in. In the context of Samsung’s Exynos chipsets, this refers to the internal USB 3.0 Controller.

Exynos: This identifies the brand of your System on Chip (SoC), found in many Samsung Galaxy models (and some Chromebooks).
Device4000: This is often the memory address offset or hardware ID assigned to the USB 3.0 PHY (Physical Layer) or the controller interface inside the processor.

Essentially, this is the hardware component responsible for managing the charging port and data transfer. Even if nothing is plugged into the port, this controller remains active and monitored by the system’s thermal sensors. exynos usb device4000 hot

Monitor thermal zones

cat /sys/class/thermal/thermal_zone*/temp Deep Dive: Exynos USB Device 4000 Overheating Phenomenon

Abstract

This paper analyzes the thermal behavior, root causes, and mitigation strategies for the reported "Exynos USB Device4000 hot" issue: elevated temperatures observed on devices using Samsung Exynos SoCs when the USB Device4000 controller is active. It synthesizes SoC architecture, USB controller operation, thermal measurements, firmware/driver interactions, and practical remedies for engineers and system integrators. Exynos: This identifies the brand of your System

Step 4: Correct USB Drivers (Windows)

Action:

Download the latest Samsung USB Driver from Samsung Developers.
Uninstall any existing “Unknown USB Device” or “Samsung Mobile USB Composite Device” from Device Manager.
Reboot and reinstall the driver.
If using libusb (e.g., with Heimdall), use Zadig to force the driver to libusb-win32 or libusbK for the device with VID 0x04E8 and PID 0x4000.

Test: After driver reassignment, the error should no longer appear in Odin or Heimdall.

4. Diagnostic Indicators

On a rooted Android or Linux-based Exynos device, check: