pol_12v01

Easy Fix

Polestar · Electric Cars

12V Battery Degraded

Quick Answer

Error code POL_12V01 on your Polestar Electric Cars means: 12V Battery Degraded. This is usually fixable — see the step-by-step guide below.

Affected Models

Applies to all models

PS2 PS3 PS4 PS5 PS6

Likely Causes

12V lithium auxiliary battery reaching end of service life with reduced capacity
DC-DC converter malfunction failing to adequately charge the 12V battery from HV source
Excessive parasitic current draw from vehicle modules during sleep or storage mode
Loose or corroded 12V battery terminals increasing resistance and reducing effective voltage
Extended vehicle storage without periodic charging depleting the 12V battery

How to Fix It

Measure 12V battery voltage with a multimeter; resting voltage should be 12.4V or above

Check charging voltage while vehicle is powered on; should be between 13.2V and 14.5V

Inspect battery terminals and cable connections for corrosion and clean as necessary

Connect the vehicle to a Level 2 AC charger to allow DC-DC converter to replenish 12V battery

Replace the 12V battery if it fails a load test or does not hold charge after charging

Pro Tip

This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.

Parts You May Need

12V lithium auxiliary battery (Polestar-specified)

DC-DC converter module

Battery terminal cleaning kit and dielectric grease

Multimeter for voltage and load testing

Related Error Codes

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