Specific Auto Problems

2020 Kia Niro EV 12V Battery Problem

Posted by Howard Gutman | Jun 13, 2024 | 0 Comments

2020 Kia Niro EV driver side outside view

The 2020 Kia Niro EV, like many modern electric vehicles (EVs), is renowned for its efficiency, eco-friendliness, and advanced technology. However, some owners have encountered a recurring issue with the 12V battery, which plays a critical role in the vehicle's overall functionality.

The Role of the 12V Battery

In an electric vehicle, the 12V battery powers the car's auxiliary systems, such as lights, infotainment, and crucial electronics like control units and the electronic parking brake. Unlike the main high-voltage battery that powers the motor, the 12V battery ensures these smaller but essential components operate correctly.

2020 Kia Niro EV Under Hood

Common Issues

Owners of the 2020 Kia Niro EV have frequently reported problems with the 12V battery, including:

  • Battery Drain: The most common issue is the unexpected draining of the 12V battery. This often leaves the vehicle unable to start or operate auxiliary functions.

One owner, Longfield, noted, "I have had my EV6 for around 2 weeks and have had 2 12V battery failures." Similarly, another owner, Allboutenergy, reported, "I tried to use the car one morning, and in spite of a 60-mile trip the previous day, the 12V battery was dead dead."

  • Frequent Replacements: Some users have found themselves needing to replace the 12V battery multiple times within a short period, suggesting a potential underlying issue with the vehicle's charging system or a high parasitic drain.

JR shared their frustration, stating, "The 12V battery issue first occurred in May 2021, approximately six months after the purchase, when the vehicle had less than 3000 miles on it."

  • Warning Signs: Drivers have reported seeing warning lights on the dashboard, indicating a problem with the battery or charging system, often accompanied by a loss of functionality in the car's electronic systems.

Astigmatism reported, "On Thursday the detail shop called me to say that the car appears to be dead - the dome light barely flickers on, it's not responding to the key, etc."

Possible Causes

Several factors could be contributing to these issues:

  • Software Glitches: Sometimes, the car's software fails to manage the battery's charge correctly, leading to an unexpected drain.

J1m shared, "I was told by my dealer, who had my car in today, that there is a software update for 12-volt battery discharge issues."

  • Parasitic Drain: An excessive drain on the battery while the car is off could be due to a malfunctioning component that continuously draws power.

JK-KIAEV6 suggested, "I would also be asking what is causing the power draw also as it's not normal."

  • Charging System Faults: Issues with the onboard charger or wiring can prevent the 12V battery from recharging properly from the main battery.

According to Allboutenergy, "Apparently the 12V charge algorithm doesn't work very well."


Kia has been addressing these problems through software updates. However, if you are experiencing persistent issues with your 2020 Kia Niro EV's 12V battery, it might be more than just an inconvenience; it could be a case for lemon law.

Owners experiencing these issues should:

  • Visit a Dealership: Professional diagnosis and repair can often resolve these issues, especially if they are covered under warranty.

pss recommended, "The dealership should remove the battery and fully test the battery. Then fully charge the battery."

  • Software Updates: Ensure the vehicle's software is up to date, as updates can fix bugs that cause battery drain.

pss also mentioned, "All software controlled and will be addressed by Kia."

  • Battery Replacement and Testing: If the 12V battery issue persists, insist on a new replacement battery.

Chip advised, "If the battery is truly dead...I would insist on a new replacement battery."

  • External Charging Solutions: Consider keeping a jump starter or a 12V rechargeable lithium-ion battery in the vehicle as a backup.

As JR noted, "Jumping the vehicle by attaching the leads from this backup battery to the installed battery in each case restores the vehicle to operating condition."

  • Consult with a Lemon Law Lawyer: If the issues persist despite multiple repair attempts, you might be entitled to a replacement vehicle or a refund under the lemon law.

Legal Recourse

If your 2020 Kia Niro EV is experiencing ongoing 12V battery problems, don't hesitate to seek legal advice. Explore potential claims, including:

  • Lemon Law Claim: If your vehicle has significant defects that impair its use, safety, or value, lemon laws may provide relief.
  • Deceptive Practices Claim: Misleading or deceptive actions by the manufacturer or dealer could entitle you to compensation under deceptive practices laws.
  • Breach of Express Warranty Claim: Manufacturers must uphold the promises made in their warranties. If they fail to do so, you may have grounds for this claim.
  • Magnuson-Moss Claim: Federal law ensures that consumers receive the benefits of warranties and fair treatment for defective products.
  • Breach of Implied Warranty Claim: Your vehicle should meet certain expectations of quality and performance, and if it doesn't, you may have a case under this claim.

We specialize in lemon law and warranty cases for 2020 Kia Niro EV owners. Call us at (973) 598-1980 for a free consultation and get the compensation you deserve.


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About the Author

Howard Gutman

Hiring an attorney can be a stressful and confusing situation.  You want an expert, honest, personal approach to your case.  The Law Office of Howard Gutman has been fighting for consumer rights and representing commercial interests for over 20 years.  We have a deep knowledge of fraud, consumer,...


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