1. Jan 17, 2024 #1
   

   Mark Goettel New Member

   My 12 Volt battery died at -40C. Had battery tested, it was dead. Replaced battery and now have error message "12 Volt Battery charging system problem". Car will run for a few meters and then error appears as the 12 V battery voltage drops as presumably it is not being charged. I recharge the battery with a battery charger and the cycle reappears.

    
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2. Jan 18, 2024 #2
   

   Robert_Alabama Well-Known Member

   Not likely the problem, but have you checked the terminal connections for being clean and tight?

    
3. Jan 18, 2024 #3
   

   Landshark Well-Known Member

   Oregon 2019 Touring PHEV

   Have you measured the voltage with the car in Ready mode? It should be around 14V. If not, there could be an issue with the DC/DC converter (fuse, relay, wiring) which charges the 12V battery from the HV battery.

    

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