Diesel Laptops Bypass Breakout Main Programming Cable

Diesel Laptops Bypass Breakout Main Programming Cable



Diesel Laptops Bypass Breakout Main Programming Cable

This is the main cable harness used to connect directly to a commercial truck ECM.


  • All cables are tested on live ECMs and validated before shipping.
  • Professional, quality manufactured cable made in the USA.
  • 12 month warranty on all components.

This is our "main" cable that you can use to build your own unique bypass/breakout cable to connect directly to a commercial truck ECM. If you purchase any of our bypass cables individually, you will need this cable as well. Our bypass cables are a 2-piece system, with each one needing this one.

This main harness connects to a power source and provides a 9 pin connector that is detachable. This allows you to purchase the ECM connectors you need, instead of having to purchase a completely new harness.

Why would you need an ECM breakout harness?
  • Most OEMs recommend NOT programming the vehicle through the dash connector, but instead go directly to the ECM. These are the perfect programming cables for such a project.
  • You are having issues with the diagnostic port on your commercial truck, and wish to bypass the vehicle wiring and go directly to the ECM.
  • You have an ECM that is not installed on the truck and wish to do programming or modifications on the workbench.
Vendor: Diesel Laptops
Part Number: BYPASS-MAIN
UPC: 735520736848
Length: 24 inches
Weight: 1.5 lbs

ECM Programming

If you would like more information about ECM programming, check out this video or click below for a great blog post that goes in-depth on the subject, including what software is necessary.

Learn More
Bypass Cable Kit

Bypass Master Cable Kit

This main cable is included in our Bypass Breakout Master Cable Kit along with the necessary cables to connect to Cummins, Detroit, and CAT engines.

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More Bypass Cables

Additional Bypass Cables

This main cable is one half of a two-piece system. To connect to the ECM, you'll also need the bypass cable for the engine to which you're connecting.

View Cables
30 Day Money Back Guarantee

30-Day Money Back Guarantee

At Diesel Laptops we ensure your satisfaction with a 30-Day Money Back Guarantee on this product, giving you confidence in your purchase.

For detailed information on our guarantee, please visit our Return Policy page below.

View Return Policy

Contact Us


If you have any questions about this or any other product, please don't hesitate to contact one of our Diesel Laptops experts at (888) 983-1975 or by clicking below!

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Customer Reviews

Based on 3 reviews
Jimmy Boriack

Worked out great

sergio castillo

Diesel Laptops Bypass Breakout Main Programming Cable

Robert Adkins

Fast shipping, quality cables