Bypass Breakout Cable for CAT 40-Pin ECMs
Click To Enlarge

Bypass Breakout Cable for CAT 40-Pin ECMs

Price: $249.00
  • Item #: BYPASS-CAT-40-PIN
  • Manufacturer's Product Number: BYPASS-CAT-40-PIN
* Marked fields are required.
Qty: *

This cable is used on the more "older" CAT engines, which includes the 3406E, C-10, C-12, and more. Some sample engine serial numbers (ESN) that this CAT cable harness would include:

  • CAT 3406E, C-10, & C-12 with ESN: 8YS, 9NS, 5DS, 1LW, 2PN, 1YN, 5EK, or 6TS.

If you engine serial is number is not listed, please call or email us so we can verify for you. If you look at your ECM, and it had 40-pins, this cable will work.

Our CAT cables can be used for a variety of purposes, including:

  • 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.
  • 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.


  • Harness length is 10'.
  • 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

NOTE: This cable will not work by itself. You will need part number BYPASS-MAIN for this cable to function properly. Our unique design allows you to purchase this main cable first, then purchase the "ends" that you need to connect to various ECMs


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

Reviews (0) Write a Review
No Reviews. Write a Review