I have about 15k miles on my truck, I have been getting same message for the last 5k miles. I drive about 1k miles a week. No warning lights but I have noticed the volts bouncing from as low as 12.2v up to over 15v. Nominal voltage should be about 14.1v for most vehicles. I have never seen fluctuations as big as this on any of my vehicles, usually rock steady around 14v. I would typically diagnose that as a bad voltage regulator or a bad ground, less likely bad battery. I don't have time for dealer BS, every thing they do takes 2 or 3 visits minimum, because first, they cant believe there could possibly be a problem so they do nothing, send you on your way, you go back, then they need to order parts, then another return visit to install the parts and maybe its fixed, if your lucky. I need to call because it's warranty but I really don't want to.