Scr code/ ELD system

[Nilao]

I know on my new truck the eld cannot plug into the diagnostic port. It had to use a rp1226 connector. I plugged mine into the diagnostic port and it cause issues even with the key off. Things like powering on the dash like the key was on. Once I found out i needed to order the proper cable it fixed my issues. The part number is 45-JE141-1A. I know in 2018 they still used the round green plug for ELD but in 2019 they changed to the RP1226 plug for ELD. I wonder if your harness was the 2019 harness in the 18 truck....