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The notification on the 2015 Ford F-150 indicates a problem with the trailer battery not charging. This may occur due to an issue with the trailer module (TRM) and can be resolved by updating it to the latest calibration using IDS version 96.01 or above. First, ensure the battery is fully charged, then inspect the wiring harness for any signs of damage or shorts. If no damage is found, the TRM will require calibration. You must be connected to the internet to apply the module programming for the latest updates and calibration files, available at http://www.motorcraftservice.com/.
If the error message on your 2015 Ford F-150 indicates that the trailer battery is not charging, ensure that you have not chosen electric brakes in the trailer settings. If that does not resolve the issue, there is a software update available to fix this problem, which can be installed at any authorized Ford dealership.