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12V battery warning on 2024 Polestar 2 - frequent drain?

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Mike T. · rep 0 · May 25, 5:23 AM · 1 replies · solved · Question

Vehicle: 2024 Polestar 2 Long Range Dual Motor

I've been getting "12V Battery Service Required" warnings on my 2024 Polestar 2 Dual Motor. It seems to happen after the car sits for a day or two, especially if I haven't driven it much. Sometimes the car struggles to "wake up" or shows other minor electrical glitches.

I know EVs have a 12V battery for auxiliary systems, and I'm worried it's draining quickly. The car is brand new, only a few months old. I thought these issues were mostly with older EVs.

Is there something specific that could be causing a parasitic drain? Or is this a known issue with the 12V battery management in newer Polestars? What should I check before taking it in?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 5:23 AM

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ClearTheCode admin answer:

The "12V Battery Service Required" warning on a new 2024 Polestar 2, coupled with sluggish wake-up, is a significant electrical concern. While often associated with older vehicles, 12V battery issues can occur in new EVs due to their complex electrical architecture. Here's what's likely happening and what to do:

  1. Role of the 12V Battery: In an EV, the 12V battery powers all auxiliary systems, including the infotainment, lights, door locks, and most importantly, the contactors that connect the high-voltage battery to the drivetrain. If it's too low, the car cannot "start" or wake up properly.
  2. Parasitic Drain: This is the most common cause. A module or system in the car isn't properly shutting down, continuously drawing power even when the car is off. Common culprits include:
    • Software Glitches: A bug preventing a module from entering sleep mode.
    • Aftermarket Accessories: Anything plugged into the OBD-II port or 12V outlets (dashcams, trackers) can cause drain if not properly installed or designed.
    • Faulty Module: A specific control module (e.g., for telematics, infotainment, or a sensor) could be internally shorting or failing to power down.
  3. Charging System Issue: The DC-DC converter, which charges the 12V battery from the high-voltage battery, could be faulty or not functioning optimally, leading to an undercharged 12V battery.
  4. Defective 12V Battery: Though less common in a brand-new car, a manufacturing defect in the 12V battery itself cannot be entirely ruled out.

What to Check (Safely):

  • Unplug Accessories: Remove any aftermarket devices plugged into the car.
  • Observe Behavior: Note if the problem is worse after specific actions (e.g., leaving a door ajar, using a particular app).

When to See a Shop: Do not attempt to jump-start the 12V battery yourself without consulting your owner's manual, as improper procedures can damage sensitive electronics. Given this is a brand-new vehicle, the "12V Battery Service Required" warning indicates a fault that needs professional diagnosis. You should schedule service with a Polestar service center immediately. They will:

  • Perform a diagnostic scan for codes like P0A0F (12V System Voltage Low), U0100 (Lost Communication with ECM/PCM A), or specific manufacturer codes related to power management.
  • Conduct a parasitic draw test to identify which circuit is drawing excessive current.
  • Test the 12V battery's health and the DC-DC converter's function. This is a warranty issue and should be addressed promptly to prevent further electrical problems.
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