2018+ RAM Security Bypass cable
All 2018+ model year FCA vehicles have a new security feature that was implemented to prevent the OBD-II diagnostic port from being used for aftermarket recalibration tools and performance tuners. The 2018+ Ram ProCal Module includes AEV’s Bypass Harness kit. This kit will bypass the new security feature, allowing the vehicle to be properly recalibrated by the end user, instead of having to take it to a dealership and potentially being flagged for aftermarket modifications. Installation takes less than 5 minutes with no permanent modifications to the vehicle.
Please see this YouTube Video for Installation Assistance: Bypass Harness Install Video