Windows feature update and upgrade error codes (0xC1900101 and more): a quick reference

A feature update that fails on an Intune-managed PC usually rolls back quietly and leaves one code behind, often 0xC1900101 with an extend code such as 0x4000D. This reference lists the upgrade codes Microsoft documents (rollback extend codes, compatibility and disk space blocks, setup engine errors) with the meaning, the usual cause and the first check. Quality update and servicing codes are in the Windows Update error code reference.

How to read these codes#

Where to find the code:

• On the device. Settings › Windows Update › Update history shows the failed feature update and its code. During a rollback the user sees Restoring your previous version of Windows.
• In Intune. The Windows feature update report under Reports › Windows updates shows each device's Update State, Update Substate, aggregated status and latest Alert Type; the Windows Feature Update Device Readiness Report flags hardware that can't upgrade. Devices that never get offered the update are a different problem (feature update not offered).
• SetupDiag. SetupDiag ships with Windows Setup and runs automatically after a failed upgrade. Its analysis lands in %WinDir%\Logs\SetupDiag\SetupDiagResults.xml and under HKLM\SYSTEM\Setup\SetupDiag\Results. When it lists several failures, the last one is typically the fatal one.

Windows Setup returns a result code and an extend code, written as 0xC1900101 - 0x4000D; some tools capture only the result code. A result code starting with 8 is a Win32 error and one starting with C is an NTSTATUS value; the last four digits identify it (0x80070070 is ERROR_DISK_FULL). In the extend code, the first digit is the phase and the last two digits are the operation:

Operation digits you will meet most: 04 install recovery environment, 07 install drivers, 0C apply image, 0D migrate data, 17 boot, 18 sysprep and 1E pre-OOBE. So 0x4000D is a data migration failure during the second boot.

The setup logs are hidden. setupact.log is the most useful and setuperr.log lists errors only: look in $Windows.~BT\Sources\Panther for downlevel failures, $Windows.~BT\Sources\Rollback after a rollback (with setupmem.dmp and setupapi\setupapi.dev.log), and %windir%\Panther or %windir%\Panther\NewOS for later phases (Windows upgrade log files). Find the last occurrence of the result code and read upward.

Get-ItemProperty 'HKLM:\SYSTEM\Setup\SetupDiag\Results' -ErrorAction SilentlyContinue
Select-String -Path 'C:\$Windows.~BT\Sources\Panther\setupact.log' -SimpleMatch `
    -Pattern 'Shell application requested abort', 'Abandoning apply due to error for object' |
    Select-Object -Last 5
# Manual run from an elevated prompt (needs .NET Framework 4.7.2 or later)
.\SetupDiag.exe /Output:C:\SetupDiag\Results.log

0xC1900101 rollback codes#

0xC1900101 is a generic rollback code that can appear in any phase except downlevel. It usually means an incompatible driver, so the standard first moves are current drivers and firmware, unplugged peripherals, no third-party security software during the upgrade, and enough free space.

0x800xxxxx codes with extend codes#

These are general Windows errors (timeouts, failing devices, processes ending unexpectedly) raised during setup; the extend code tells you where.

Setup engine and compatibility codes (0xC19…)#

Other upgrade codes#

How to verify a fix#

1. Retry the upgrade: Check for updates in Settings › Windows Update for policy-driven feature updates, or rerun setup from media.
2. Confirm the new version: Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion' | Select-Object DisplayVersion, CurrentBuild.
3. Run SetupDiag again if in doubt; its rules include one that decides from the logs whether the upgrade succeeded.
4. In Intune, the device's aggregated status in the feature update report leaves Error after the next data refresh.

If it rolls back again with a different extend code, you fixed one blocker and met the next; work through the logs again.

References#

• Windows upgrade resolution procedures (Microsoft Learn): extend codes, causes, mitigations and the mosetup list
• Windows upgrade error codes (Microsoft Learn): result codes, phases and operations
• SetupDiag (Microsoft Learn): automatic analysis and parameters
• Get help with Windows upgrade and installation errors (Microsoft Support): 0x800F0922, 0x800F0923 and other common codes