snipe wrote:
Had a similar issue with my brakes 2 years ago, brake controller was identifying an issue with trailer brake connections, it turned out to be a broken wire going to the magnet inside the brake drum that was shorting out intermittently to ground on the brake assembly. As a test raise up each wheel one at a time and spin the wheel, activate the brakes pulling the emergency cutoff switch cable, that is how I found my issue.
Same issue here. We bought a new truck last year (2015 Sierra 3500HD) and we had occasional messages. Tried all new connectors - didn't resolve. It was a badly frayed wire near a magnet.
These new controllers in the new trucks are very good!