2021 CAT Caterpillar ET Diagnostic Adapter III

Caterpillar electronic technician 2021A with WinFlash future is an updated version of the caterpillar dealer diagnostic software that can help technicians to diagnose existing and potential problems with their electronically controlled Caterpillar Engines and Machines.


Microsoft ended extended support for Windows 7 as of January 2020. The CAT ET service tool no longer supports Windows 7 as of the 2020B release. The installation is still possible, but we’re not able to guarantee the stable work of 2020B or later versions.

In case if you still running windows 7, we can offer you the 2020A version as last compatible with windows 7, for this purpose, please indicate the 2020A release in the comments field.

The list of supported CAT machines and engines can be found below(if your vehicle is missing, please contact us we will double check):

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Electric Power

Electric Power Generation


Marine Power Systems

Oil and Gas


Articulated Trucks

Asphalt Pavers

Backhoe Loaders

Cold Planers





Feller Bunchers

Forest Machines



Hydraulic Mining Shovels

Knuckleboom Loaders

Material Handlers

Motor Graders

Off-Highway Trucks


Road Reclaimers

Site Prep Tractors

Skid Steer and Compact Track Loaders



Track Loaders

Underground – Hard Rock

Underground – Longwall

Underground – Room and Pillar

Utility Vehicles

Wheel Dozers

Wheel Excavators

Wheel Loaders

Wheel Tractor-Scrapers

The Built-in Factory Password Generator

The experimental feature allows you to decode (18-Bit passwords not supported) factory passwords

Cat works with the Caterpillar Communication Adapters family.

The recommended adapter is a Caterpillar Communication Adapter III Kit PN 538-5051 (Replaces 466-6258).

This diagnostic app allows you to: Change vehicle’s parameters Lock / Unlock parameters Diagnose and reconfigure Reading of error codes ECM Flash

Recently, we have received a lot of questions about the most convenient way to obtain this product.

As soon as payment is done you will be redirected to the download page.

The Electronic Technician application can be easily downloaded.

The small file size(~ 500Mb) allows you to get and set up the app within up to 20 minutes even with a slow internet connection or mobile internet.

The activation takes about 5 minutes and you’re ready to go.
Error When Launching Service Tool

There is a Microsoft issue with upgrading libraries during an installation involving certain versions of the C++ redistributable. After a successful service tool installation, when trying to run the service tool for the first time, one of the following errors may occasionally appear: “The entry point could not be located in api-ms-win-crt-runtime” or “The program can’t start because mfc140u.dll is missing from your computer.” If either of these messages is displayed, follow the procedure below. This procedure requires administrator rights.

1. Open the Start Menu

2. Click the Control Panel

3. Click the “Programs and Features” icon. If there is only a “Programs” icon, click the “Uninstall a Program” link next to the icon.

4. Find the program entry for either “Microsoft Visual C++ 2015 Redistributable (x86) – 14.0.24215” or “Microsoft Visual C++ 2015 Redistributable (x86) – 14.0.242151”

5. If the specified program entry is not found, proceed directly to step 8

6. If the specified program entry is found:

a) Right-click the specified program entry

b) Click the Change menu item

c) Click the Repair button in the dialog that appears

d) Verify that the service tool runs properly

7. If the service tool still displays an error after the Repair operation:

a) Right-click the specified program entry

b) Click the Uninstall menu item

8.download an x86 version of the runtime package from Microsoft.

9. Install the downloaded package

10. Verify that the service tool runs properly

11. If the service tool still displays an error, please send an email to the support department.
Caterpillar ET Getting Started Guide in PDF Format
What’s New – 2021A
No significant new features or feature enhancements
What’s New – 2020C

No significant new features or feature enhancements
What’s New – 2020B

Trainer Update – 299D3

The 299D3 Skid Steer Loader has been added to the Trainer application.
What’s New – 2020A

Product Status Report Updates

The Product Status Report has been updated to include throttle configuration information.

Built-in Factory Password Generator

The experimental feature allows you to decode (18-Bit passwords not supported) factory passwords
What’s New – 2019C

Indication of Selected Communications Adapter

The service tool now displays the selected communications adapter when the service tool is disconnected. The adapter name is displayed in the status area at the bottom right of the service tool window.

End of Support for Windows 7

Microsoft is ending extended support for Windows 7 as of January 2020. The service tool will be ending support for Windows 7 as of the 2020A release.
What’s New – 2019B

Automatic Product Status Report (PSR) Upload

The service tool includes a new tool that automatically uploads Product Status Reports. The tool scans for newly generated Product Status Reports and uploads them when an internet connection is available. The default is that automatic report uploading is enabled. The Preferences dialog has an option to disable the tool.


For more information please click https://www.cnautotool.com/category-44-b0-Professional+Diagnostic+Tools.html . FREE, Professional & Unlimited Technical Support, Factory Price!