2025 Hyundai Ioniq 5 Battery Issue (P1AA700) Explained: What Car Enthusiasts Need to Know

Daily Car

·

29/12/2025

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Q1: What is the main battery issue reported with the 2025 Hyundai Ioniq 5?

A small number of early-production 2025 Hyundai Ioniq 5 vehicles assembled in North America and equipped with NACS (North American Charging System) plugs have experienced a battery-related problem. Specifically, a voltage imbalance between cells in the high-voltage battery causes a P1AA700 error code. This situation prevents the battery from charging fully and ultimately leads to charging failure.

Q2: How does this issue affect the performance and practicality of the Ioniq 5?

Owners experiencing this fault observe slower charging speeds at fast-charging stations. Eventually, the car may be unable to fast charge at all, and even Level 2 charging will stop working as the issue progresses. This means that on long trips or during daily use, affected vehicles may not be reliable until the battery is replaced. Hyundai dealerships are addressing it under warranty by replacing the defective battery pack.

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Q3: What causes this P1AA700 code and battery cell imbalance in plain terms?

The battery in an electric vehicle like the Ioniq 5 consists of hundreds of individual cells. The Battery Management System (BMS) monitors these cells, ensuring they charge and discharge at the same rate. If one cell charges differently, the BMS can initially compensate, but a growing imbalance can slow charging. If the imbalance becomes too significant, the system detects it, issues the P1AA700 error (cell voltage deviation), and disables charging to prevent damage or unsafe conditions.

Q4: How does the Ioniq 5's battery warranty apply to this issue?

The Hyundai Ioniq 5 is covered by an 8-year or 100,000-mile battery warranty. Manufacturing defects affecting cell voltage balance, BMS functionality, or other battery components are generally detected within this period. For the affected models showing the P1AA700 error, Hyundai is performing in-warranty battery replacements at no cost to the owner.

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Q5: How does the Ioniq 5 compare to other electric vehicles regarding battery reliability and support?

The vast majority of modern EVs, including the Ioniq 5, have reliable battery systems designed to last over 300,000 miles. Isolated failures like this are uncommon and typically resolved under warranty. Hyundai’s prompt response, including fast-tracked battery replacements, demonstrates strong manufacturer support. Compared with industry peers, Hyundai’s approach and warranty terms match or exceed expectations.

Q6: Should owners be concerned about long-term battery life in the Ioniq 5?

Current data shows that such failures are rare and, when they do happen, are usually caught within the warranty period. Ongoing monitoring by the BMS, quality control improvements, and robust warranties mean owners can be confident in the long-term performance and reliability of the Ioniq 5’s battery system. Routine software updates and professional maintenance further ensure longevity.

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Conclusion

While some early 2025 Ioniq 5 models have reported a battery cell imbalance issue, Hyundai's warranty coverage and replacement process address the concern effectively. Overall, the incident is isolated and does not reflect the general quality and reliability of the Ioniq 5 or other EVs in its class.

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