› M1 Support Forum › 1141 = Expansion Module Trouble Message › Reply To: 1141 = Expansion Module Trouble Message
January 13, 2026 at 11:41 am
#9814
Gary Hansen
I checked the resistance across Data A and Data B. It was a little over 120 ohms which you have indicated means a terminating jumper is missing. I checked inside the primary M1KP2 and I saw no terminating resistor. I presume where this should be placed is on the 2 pins toward the bottom edge of the printed circuit board, but I am not sure. are you able to post a drawing or picture for me to verify. If it is missing, how can I get replacements?
If it is indeed missing, would this cause the Expansion Module Trouble error?
Thanks again for the help.
