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Polestar 2 12V Battery Warning - What does it mean?

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Amanda S. · rep 0 · May 22, 7:53 AM · 1 replies · solved · Question

Vehicle: 2022 Polestar 2 Long Range Single Motor

Hey everyone,

I've got a 2022 Polestar 2 Long Range Single Motor, and recently I've started getting a '12V Battery Service Required' message on my dashboard. It pops up intermittently, usually when I first start the car or after it's been sitting for a bit.

Is this something I should be really worried about? I thought EVs didn't have traditional 'car batteries' in the same way. What exactly does the 12V battery do in a Polestar 2, and could this warning be a sign of a bigger problem?

Also, is this something I can check or replace myself, or do I absolutely need to take it to the dealership? Any tips on what to look for or how to diagnose it would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 7:53 AM

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ClearTheCode admin answer:

The '12V Battery Service Required' message in your 2022 Polestar 2 is a common concern for EV owners, but it's usually manageable. Here's what you need to know:

  1. Role of the 12V Battery: While your Polestar 2's main propulsion comes from its high-voltage battery, the 12V auxiliary battery powers all the traditional low-voltage systems: lights, infotainment, power windows, door locks, and crucially, the car's computers and relays that 'wake up' the high-voltage system. If the 12V battery is weak, the car might not start or function correctly, even if the main battery is fully charged.

  2. Common Causes for the Warning:

    • Age/Wear: Like any lead-acid battery, the 12V battery has a finite lifespan, typically 3-5 years. Your 2022 model is getting to the age where this could be a factor.
    • Parasitic Drain: Accessories or software glitches can sometimes cause a slow drain on the 12V battery when the car is off.
    • Charging System Issue: The DC-DC converter, which charges the 12V battery from the high-voltage battery, could be malfunctioning. This is less common but possible.

  3. DIY Diagnostics and Replacement:

    • Check Voltage: You can test the 12V battery's voltage with a multimeter. A healthy battery should read around 12.6V when the car is off. If it's consistently below 12.0V, it's likely weak.
    • Replacement: The 12V battery in the Polestar 2 is located under the hood, similar to a traditional car. It is generally considered a DIY-friendly replacement for those comfortable with basic car maintenance. You'll need a new AGM (Absorbent Glass Mat) battery of the correct size and specifications (often H5/Group 47 or H6/Group 48). Ensure you disconnect the negative terminal first and reconnect it last. It's advisable to use a memory saver tool to prevent losing vehicle settings.

  4. When to See a Shop:

    • If the warning persists after replacing the battery.
    • If you're uncomfortable performing the replacement yourself.
    • If you suspect a parasitic drain or an issue with the DC-DC converter (which would require specialized diagnostic tools).
    • If the car exhibits other electrical issues or fails to start completely.

Addressing this warning promptly is important to avoid being stranded. A new 12V battery is often the simplest and most effective solution.

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