In most cases, you need a dual-filament rear taillight bulb, typically a 3157 or 3157A, for the 2017 Elantra. However, exact bulb type can vary by trim or region, so verify by checking the existing bulb or owner's manual.
How to identify the correct bulb for your car
Use these steps to confirm the exact bulb size for your specific vehicle.
- Check the owner's manual bulb chart for the rear combination lamps or the bulb size printed in the spare parts section.
- Look at the bulb in the tail/brake light housing: many bulbs have the size stamped on the glass or base (e.g., "3157").
- Remove the current bulb from the rear lamp to read its marking and confirm the filament configuration (2-filament vs single).
- Inspect the trunk lid or driver's door jamb sticker that lists recommended bulb sizes for exterior lamps.
- If in doubt, bring the old bulb to a parts counter or call a Hyundai dealer with your VIN for the exact specification.
By identifying the exact bulb, you ensure you buy the correct part and avoid lighting issues or bulb mismatches.
Common bulb options you might encounter
Below are the bulbs most often used in the rear lighting assemblies of the 2017 Hyundai Elantra. Always verify before purchasing.
- 3157 or 3157A dual-filament bulb for the rear taillight and brake function in most configurations.
- Some regional or trim variants may use a 7443 or 1157-style bulb in the same position; confirm with the current bulb.
- The center high-mount stop lamp (CHMSL) in some trims is LED or uses a separate dedicated bulb; verify if you plan to replace that one.
Knowing the exact bulb helps you source the right part and plan replacements with minimal downtime. If you’re replacing multiple bulbs at once, replace them in pairs to maintain even brightness.
How to replace the brake light bulb safely
Follow these steps to replace the bulb once you have the correct type.
- Turn off the vehicle and remove the keys; for safety, disconnect the negative battery terminal if you’ll be working near wiring and to prevent short circuits.
- Access the rear lighting assembly by removing the trunk lining or cover panel; locate the brake/taillight bulb socket.
- Carefully twist the bulb socket counterclockwise to detach, then pull the old bulb straight out of the socket.
- Insert the new bulb, ensuring the tabs align; re-seat the socket into the housing and twist to secure.
- Test the lights by pressing the brake pedal with the ignition on to confirm functionality, then reassemble the trim.
Always handle bulbs with clean gloves or a cloth to avoid transferring oils that can shorten bulb life. If the CHMSL is LED, it will require a replacement module rather than a bulb.
Where to buy and price considerations
Economy, OEM, and premium aftermarket options are widely available. If you want exact factory specifications, ask for Hyundai Original Equipment bulbs or check with the dealer using your VIN.
- OEM bulbs ensure exact color temperature and fit.
- High-output or long-life alternatives are available but may require a higher price or different brightness.
- Online retailers and auto parts stores typically stock 3157/3157A variants; ensure the base and filament count matches your car's lamp.
When buying, consider whether you are replacing one or all rear bulbs; replacing in pairs can help maintain uniform brightness and color across the tail lights.
Summary
For most 2017 Hyundai Elantras, the rear brake/taillight uses a dual-filament 3157 or 3157A bulb, but trim-level and regional variations can apply. Verify by checking the existing bulb or the owner's manual, then replace with the correct 3157 family bulb. If you are unsure, consult a Hyundai dealer or a professional mechanic to avoid incorrect parts or wiring issues.