E James

Thank you

After trial and error of finding out how to fix “service trailer brake system” code, I found the suspension control module to be the problem. I swapped with one from a different truck and code and message cleared. However, I could not keep that one and ordered a replacement. It is a different model number and when installed the message will not go away like it did before. Do these need programmed or do I need to order exact model number replacement?