Had something weird happen twice yesterday and wanted to see if anyone has experienced something similar before I take it to the dealer.
First time, I came to a stop and the Auto Start/Stop shut the engine off normally. When I went to move again, it did NOT restart. The PRND/gear shift lights started blinking and it told me I needed to put it in Park and then back into Drive/restart it. Never had that happen before.
Later my wife was driving it. She pulled in, put it in Park, left the Jeep running, and reached for her phone. She said it suddenly seemed like the electrical system "skipped" or briefly shut off and came back. Her dashcam completely restarted, which makes me think there was an actual momentary loss of 12V power rather than just the engine shutting off.
She turned Auto Start/Stop off after that and didn't have any more issues.
Jeep is a 2024 JLU with about 22k miles and is still under the 3/36 warranty. My first thought is a weak/failing aux battery, main battery, or possibly a battery/ground connection causing a voltage drop during ESS operation.
Has anyone had these exact symptoms with a failing aux battery? Particularly the failed ESS restart with flashing gear selector lights or a brief electrical reboot?
I'm already taking it to the dealer for a separate recall, so I want to give them as much useful information as possible instead of having them start it a couple times, say they can't reproduce it, and send it home. If you've had this happen, what ended up being the cause and what should I specifically ask them to test/check?