Diesel Laptops Bypass Breakout Master Cable Kit for Cummins Detroit CAT

Diesel Laptops Bypass Breakout Master Cable Kit for Cummins Detroit CAT


This exclusive diesel breakout and bypass harness kit from Diesel Laptops gives you all the most common cables you would need for Detroit, CAT, and Cummins.

These cables can be used in the following situations:

  • You are having issues with the diagnostic port on your commercial truck, and wish to bypass the vehicle wiring and go direct to the ECM.
  • You have an ECM that is not installed on the truck, and wish to do programming or modifications to it on the workbench.
  • Most OEMs recomend NOT programming the vehicle through the dash connector, but instead go direct to the ECM. These are the perfect programming cables for such a project.


  • The "main" harness that connects to a power source and provides the 9-pin connector is detachable. This allows you to purchase the ECM connectors you need, instead of having to purchase a completly new harness.
  • Main harness length it 24".
  • All cables are tested on live ECMs and validated before shipping.
  • Professional, quality manufacturing of cables made in the USA.
  • 12-month warranty on all components

Our master bypass harness kit includes the following:

  • The "master" cable that provides 9-pin connector and battery clamps for ECM power
  • Detroit DDEC IV Bypass Breakout Harness
  • Detroit DDEC V Bypass Breakout Harness
  • Cummins CM870, CM871, CM876 Bypass Breakout Harness
  • CAT 40-Pin Connector
  • CAT 70-Pin Connector (Both connectors give you 100% CAT coverage)

More Information

If you would like to learn more about ECM programming, we have a great blog post that goes into depth on the subject, along with explaining what software you would need.


Learn more about our engine bypass and programming cables in this short video