Windows BSOD Error 0x000001D8 — UCMUCSI_LIVEDUMP Fix

What Does This Error Mean?

The 0x000001D8 blue screen is related to the USB Type-C connection manager driver — called UCMUCSI. This driver manages USB-C ports, Thunderbolt connections, and USB Power Delivery. When it encounters a serious fault, Windows captures a live dump and may blue screen. This is commonly caused by an outdated chipset driver, a firmware issue, or a faulty USB-C device.

Affected Models

Windows 10
Windows 11
Laptops and desktops with USB-C/Thunderbolt ports

Common Causes

Outdated Intel or AMD chipset driver that includes UCSI (USB Type-C Connection System Interface) components
Faulty or incompatible USB-C device or cable connected to the computer
Firmware bug in the computer's embedded controller affecting USB-C power delivery
Thunderbolt driver version incompatible with the current Windows version
Power delivery negotiation failure between the PC and a USB-C charger or hub

How to Fix It

Update your chipset drivers. Go to your PC manufacturer's support page (for example, dell.com/support, lenovo.com/support, or hp.com/support) and download the latest chipset driver package. This often includes updated UCSI drivers that fix known issues.

Do not rely on Windows Update alone for chipset drivers — the manufacturer's site typically has newer versions.
Update your computer's BIOS or UEFI firmware. Go to your PC or motherboard manufacturer's support page, find your model, and look for BIOS updates. Firmware updates often include fixes for USB-C and Thunderbolt controller issues.

BIOS updates carry some risk if power is lost during the process. Do them when the laptop is plugged in and the battery is charged, or when the desktop is on a UPS.
Disconnect all USB-C devices. Remove any USB-C hubs, cables, monitors, or chargers connected to the USB-C ports. Test whether the crashes stop without any USB-C devices connected.

A specific USB-C cable or hub may be triggering a power delivery negotiation failure. Test each device one at a time to identify the culprit.
Update Thunderbolt drivers if your PC has Thunderbolt ports. Go to Device Manager, expand 'System devices,' and look for Intel Thunderbolt entries. Right-click each and update. Alternatively, visit Intel's driver download page.

Thunderbolt and UCSI are separate but related — both should be updated together.
If the crash happens specifically when a certain USB-C charger is plugged in, try a different charger. Some third-party USB-C chargers do not properly implement USB Power Delivery negotiation, causing the UCSI driver to fail.

Use chargers certified by USB-IF (USB Implementers Forum) for best compatibility. Cheap uncertified USB-C chargers are a known cause of USB-C related BSODs.

When to Call a Professional

If driver and firmware updates do not resolve 0x000001D8, and the crash is linked to a specific USB-C port, the port or its associated hardware may be damaged. A technician can test the USB-C controller hardware. On laptops, a damaged USB-C port is a motherboard-level repair.

Frequently Asked Questions

What is UCMUCSI and why would it crash Windows?

UCMUCSI stands for USB Connector Manager USB Type-C System Interface. It is the Windows driver that manages communications with the USB-C port controller hardware. When this driver encounters an unexpected state — like a power delivery negotiation failure or a hardware fault — it can trigger a system crash. Because USB-C handles both data and power delivery simultaneously, errors in its management can affect system stability.

My laptop only crashes when I use the USB-C port for charging — is that normal?

No, that is a specific symptom of a USB-C power delivery issue. The crash happens because the laptop's UCSI driver is having trouble with the power negotiation when the charger is connected. Try a different USB-C charger (preferably a name-brand certified charger). Also update the BIOS — firmware updates often fix exactly this type of power delivery bug.

Does 0x000001D8 affect desktops?

It can affect any Windows computer with a USB-C port. However, it is much more common on laptops because laptops frequently use USB-C for charging, which involves the power delivery negotiation that most often triggers this error. Desktops with USB-C ports used only for data are less likely to encounter it.