Unhandled Access Violation Reading 0xxxxxx. Often occurs with pressure networks.

June 29, 2026 Nick Turner

Applies to: 
Civil 3D 2025 
Civil 3D 2026 

Issue: 
Civil 3D crashes with a Fatal Error or Unhandled Access Violation, often when opening Pressure Network fitting properties, editing connections, or swapping parts. 

Causes: 
Corrupt pressure network fitting objects. 
Damaged pressure parts catalogs. 
Custom parts migrated from older versions. 
Pressure Network defects addressed in later Civil 3D updates. 

Solution: 

Install the latest Civil 3D update for you version from www.manage.autodesk.com  

Go to manage.autodesk.com 

Click All Products 

Scroll down to Civil 3D Box and set year dropdown on left 

Click ‘View Details’ below 

Select Updates box and find the latest update for your version 

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