Short answer: The biggest problems with the 2021 Hyundai Elantra are forward collision avoidance system problems, electrical system problems, and engine issues.
Forward collision avoidance system problems are the most common, closely followed by electrical system problems, while engine issues aren’t as common.
Some of these problems have even resulted in recalls: Hyundai has issued six total for this vehicle, three of which are for exploding seat belt pretensioners.
Purchasing a new vehicle should be an exciting and satisfying experience for a consumer, but that isn’t always what happens.
Some vehicles come with defects that consumers don’t discover until after purchase, and the 2021 Hyundai Elantra is no different. Keep reading to find out what consumers are reporting about their 2021 Elantra vehicles.
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Common 2021 Hyundai Elantra Problems
2021 Hyundai Elantra Forward Collision Avoidance System Problems
The 2021 Elantra’s forward collision system relies on sensors to detect road obstacles, but owners reported those sensors either failing or triggering unnecessary braking.
Forward Sensors Failing
- Severity: Mild; more frustrating, since it disables features like cruise control
- Manufacturer’s Response: Hyundai released TSB 24-BE-005H, which cites radar sensor contamination as the cause of false or failed sensor detection.
- Fix: Dealers will replace the front radar sensor unit and recalibrate the system.
Brakes Engaging Unnecessarily
- Severity: Severe; this could result in collisions if other vehicles do not react in time and can startle or scare the driver
- Manufacturer’s Response: While no separate recall or TSB explicitly lists “unnecessary braking,” the same radar‑sensor failure covered in TSB 24‑BE‑005H could cause false detection or system mis‑behavior.
- Fix: Have the front radar unit replaced under the TSB; after replacement, verify the system’s behavior. If problems persist, inspect wiring/sensors and consider disabling affected driver‑assist functions until stable.
2021 Hyundai Elantra Electrical System Problems
Electrical systems control many functions in modern vehicles, so issues are usually obvious. 2021 Elantra owners mainly reported problems with the backup camera.
Faulty Backup Camera
- Severity: Moderate; reduces visibility while reversing, increasing the risk of collisions.
- Manufacturer’s Response: Hyundai issued recall 24V-879 for defect in the rear‑view camera; solder joints may crack over time causing image failure.
- Fix: Dealers will replace the rear‑view camera assembly with a corrected unit.
2021 Hyundai Elantra Engine Issues
Engine problems were less common for the 2021 Elantra, but some owners reported knocking sounds, which may signal a more serious issue if left unchecked.
Engine Knocking Sounds
- Severity: Moderate to high; may indicate long-term engine wear or component failure if unresolved.
- Manufacturer’s Response: No recall or TSB has been issued for engine knocking for the 2021 Elantra.
- Fix: Inspection of the engine timing, ignition, and fuel systems; repairs depend on diagnostic results.
Notes from Hyundai Elantra Drivers
“Forward sensors in vehicle have been failing while driving rain or snow since 2021; would go way on its own. Most recent failure has occurred with no debris or obstruction to sensor on a clear and sunny day. The sensor failure has been stagnant and will not go away, increasing safety concerns while driving.”
“My back up camera fails to work consistently. This issue appears to only worsen with every use. Sometimes to screen will appear half on and half off. I have yet to receive any notice of a recall and would like to get this fixed if at all possible. Thank you!”
“Love the styling, ride, high mpg (getting 41-46 mpg) and roominess but transmission had to be replaced at only 7,500 mi. Dealership had the car for more than six weeks. Several recalls for various things. Have a friend with a late model Sonata in which the engine had to be replaced. No more Hyundai for me when the lease is up in a couple months.”
Consumer Protection for Vehicle Owners
When a vehicle has a defect that keeps coming back after several repair attempts and interferes with its safety, use, or value, it may qualify as a lemon.
At that point, owners should gather all repair orders, invoices, and dealer communications to show the manufacturer had multiple chances to fix the problem but was unable to in a reasonable amount of repair attempts.
After collecting these records, the next step is to consult a lemon law attorney who can review the repair history and confirm whether the case meets the legal requirements.
If it does, the attorney can pursue a buyback, replacement vehicle, or cash settlement, and in many successful cases the manufacturer, not the consumer, is required to pay the attorney’s fees.
| Affected Vehicle | Average Lemon Law Settlement |
| 2021 Hyundai Elantra | $39,419 |
*Please note, the figures presented in the chart are approximations based on results from previous cases and should not be interpreted as a prediction or guarantee. Each case is unique and requires personalized legal guidance.
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The Lemon Law Experts are a team of attorneys passionate about consumer rights: we would love to help you bring your case and get back on the road if possible.
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