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2022 Polestar 2 - Frequent 12V Battery Drain Issues

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Heather Y. · rep 0 · May 22, 8:24 AM · 1 replies · solved · Question

Vehicle: 2022 Polestar 2 Long Range Dual Motor

Hey everyone,

I'm a new owner of a 2022 Polestar 2 Long Range Dual Motor, and I've been experiencing a really frustrating issue with the 12V battery draining frequently. It seems like if the car sits for more than a day or two, it won't start, and I get a bunch of error messages on the screen. I've had to jump-start it several times already, which is not what I expected from a brand new EV.

Has anyone else with a 2022 Polestar 2 faced similar problems? I'm wondering if this is a known issue or if I just got unlucky. It's really impacting my confidence in the car's reliability. What steps have you taken to resolve it? I'm trying to figure out if it's a software glitch, a faulty battery, or something else entirely.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 8:24 AM

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ClearTheCode admin answer: The 12V battery drain issue in Polestar 2 vehicles, particularly the 2022 model year, is a known concern that many owners have reported. This problem can manifest as the vehicle failing to start, displaying various error messages, or requiring frequent jump-starts. Addressing this requires a systematic approach.

Here are the common causes and troubleshooting steps:

  1. Software Glitches: Polestar vehicles rely heavily on software for managing all systems, including the 12V battery charging and discharge cycles. Bugs in the infotainment system or other control modules can prevent the DC-DC converter from properly charging the 12V battery or cause modules to remain active, leading to parasitic drain.
  2. Parasitic Drain: Even when the car is off, certain components can draw power. A faulty module, an accessory not shutting down correctly, or even a software bug can cause an excessive parasitic drain on the 12V battery.
  3. Faulty 12V Battery: While less common in newer vehicles, the 12V battery itself can be defective or have a reduced capacity, especially if it has been deeply discharged multiple times. The 12V battery in EVs is crucial for starting the car's electronics and engaging the high-voltage system.
  4. DC-DC Converter Issues: The DC-DC converter is responsible for stepping down the high voltage from the main traction battery to charge the 12V battery. A malfunction in this converter can lead to the 12V battery not receiving adequate charge.

When to see a shop:

  • Persistent Starting Issues: If your 2022 Polestar 2 repeatedly fails to start or requires jump-starts despite attempts to keep the 12V battery charged, it's time for professional diagnosis.
  • Error Messages: If you're seeing persistent '12V battery critical' warnings, 'Service Required' messages, or other electrical system faults on your dashboard, a technician should investigate.
  • No Obvious Cause: If you've checked for common parasitic drains (like aftermarket accessories) and the issue persists, a Polestar service center has specialized diagnostic tools to identify software-related issues or internal component failures.
  • OBD Codes: While a direct "12V battery drain" code is rare, a low 12V battery can trigger various communication or system voltage codes (e.g., U0100 - Lost Communication with ECM/PCM A, or P0A0D - High Voltage System Interlock Circuit Low if related to HV system engagement). A scan tool can help identify these.

A Polestar service center can check for relevant Technical Service Bulletins (TSBs) related to 12V battery management software updates or known hardware issues. They can also perform a comprehensive parasitic drain test and assess the health of your 12V battery and DC-DC converter.

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