ASAP2 ECU description file
File type: 3d graphics, CAD-CAM-CAE file
An a2l file is an ECU description file in the ASAP2 (ASAM MCD-2 MC) format.
It describes an electronic control unit's measurable signals, calibration parameters, memory locations, data types, and communication details for measurement and calibration tools.
File type category:
3d graphics, CAD-CAM-CAE file
Date updated: October 19, 2026
The a2l file extension identifies a structured description used in automotive measurement and calibration. The file provides tools with the information needed to identify ECU variables, read measurements, and adjust calibration parameters.
An ASAP2 ECU description file can contain details such as parameter and measurement definitions, addresses, data types, conversion rules, limits, memory segments, and the ECU's communication methods and interfaces. It describes the ECU and its calibration data rather than storing the live measurement values themselves.
ASAP2 Editor is a Microsoft Windows application for opening and editing these files. ASAP2 is also known as ASAM MCD-2 MC, an ASAM standard.
On Microsoft Windows, open the a2l file with ASAP2 Editor to view or edit its ECU description. A text editor may display the file's contents, but it will not interpret the ASAP2 definitions or provide measurement and calibration features.
An a2l file is a description and configuration file, so it normally has no useful conversion to another general-purpose format. Use ASAP2 Editor or another compatible ASAP2 tool to edit or save the description when changes are needed.
Software applications that can open a2l files:
Microsoft Windows
Software applications that can edit a2l files:
Microsoft Windows
Software capable of saving a2l files:
Microsoft Windows
Software apps that create a2l files:
Microsoft Windows
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