How to Replace the 12V Battery — 2021-2025 Hyundai Elantra

Replacing the 12V battery in your 2021-2025 Hyundai Elantra is a straightforward task often needed due to a dead or weak battery causing starting issues or electrical malfunctions. This DIY repair can save you money, costing around $100-$150 for parts compared to $200-$300 at a shop. With basic tools and this guide, most DIYers can confidently tackle this job in under an hour. DIY Cost: $100-$150 | Shop Cost: $200-$300

You’re done. Clear any stored codes with your scanner and complete a normal drive cycle so the vehicle’s readiness monitors reset.

If the code returns, the root cause likely wasn’t the part you replaced — go back through the diagnostic steps before swapping anything else.