I have done a pretty good search, but I cannot find a post on this topic. I have an 08 RL with 38k miles, purchaged last December.
Recenty the clock on the OEM radio keeps losing the correct time. No other wierd electrical symptoms.
Based on the code the current Delco battery was manufactured November 2015. Never had any cranking issues and the battery terminals are tight.
Radio issue? Some other loose connection/ground to check?