I got this message. I had a OBD bluetooth reader plugged in than was keeping the rig awake. It would kill the battery in a week or so. Jumped the rig, ditched the reader. All has been good since.
Lou: your advice to disconnect the batteries to test them individually is wise but, at least on the 3.6L JL, based on forum member testing, I understand that the batteries are actually in parallel (i.e. tied together as you say) all the time but for ESS events and an instant during engine cranks: cold or post ESS.
This guy talks about both batteries. They are tied together (by the Jeep) when they are fully charged.
You have to disconnect things to read them individually with a Volt Meter.
Hummm....... yeah they said my batteries were fine (tested, held charge, charged). Also said they cleared all codes and asked me to drive it to see if it comes back, so we'll see. I haven't gotten the error but I just parked it yest. So will test today.Thanks for the input guys! I ended up taking my Jeep to the dealer and they replaced both the main and aux batteries and I haven't had any issues since.
The tech said they test the batteries to see how long they hold a charge and mine were the worst he's ever seen lol. I guess the heat down here in Florida combined with the decline in driving due to working from home now killed them.
I have noticed that my voltage on the EVIC now hovers around 12.6 while idle and goes up to around 13.5 while driving. This is compared to earlier when I had issues where it was at 14 while idle.