2021 Hyundai Sonata

Electrical System

Electrical system failures are notoriously difficult to diagnose and repair, which often results in multiple unsuccessful repair attempts — a key element of a lemon law claim. Reported issues for the 2021 Hyundai Sonata include infotainment malfunctions, battery drain, warning lights, power window failures, and intermittent starting problems. 24 NHTSA complaints have been filed for this category. Owner reports include: “My 2021 Hyundai Sonata Limited Hybrid 12v battery has started to die randomly. My car is currently with the Hyundai dealer to confirm if this will be a warranty claim. Searching online, I have found other posts of people complaining about a similar issue with their 2021 Hyundai Sonata Hybrid.” (NHTSA Complaint #11700120)

Engine

Engine and cooling problems are among the most serious defects under California’s Song-Beverly Act. Owners of the 2021 Hyundai Sonata have reported issues including stalling, overheating, loss of power, rough idling, excessive oil consumption, and check engine lights that return after dealer repairs. With 23 NHTSA complaints on record, this defect pattern is well-documented. Owner reports include: “Hyundai technical service bulletin 23-EM-009H (EHRS COOLANT LEAK) – AKA a faulty heat exchange that causes the coolant to leak into the exhaust and burn away. Resulting in a very hard to diagnose coolant disappearance. This should be a recall. They have literally already acknowledged a manufacturer defect with the service bulletin. The problem is that in most cases, it occurs out of the 60k or 100k warranty. The dealer seems to have discretion as to which of the mileage limits apply. One dealer in NC told me 60k and my local in SC told me 100k. My problem started at 90k, but was just topped off on fluid and repaired as “normal evaporation”. Now 12k later at 102k, they acknowledged the TSB but claimed I was out of warranty. With me being out of warranty, they claimed that Hyundai would not send them tsb parts and that I would need to replace the whole system with the normal skus around 3k.” (NHTSA Complaint #11725107)

Other Systems

The 2021 Hyundai Sonata has generated 22 NHTSA complaints for this defect category. If your vehicle has experienced recurring issues in this area that the dealer has been unable to repair after multiple attempts, you may have a qualifying lemon law claim under California’s Song-Beverly Consumer Warranty Act. Owner reports include: “Component or system involved and availability for inspection: The issue involves the transmission / drivetrain system. When I entered my VIN on Hyundai’s official dealership website, a safety recall related to the transmission appeared. I took a screenshot of this recall. When I later contacted Hyundai Motor America and spoke with my assigned case manager, I was told that no such recall existed for my VIN. A few days after that call, the recall no longer appeared when checking the VIN online. The vehicle is available for inspection upon request. How safety was put at risk: A transmission-related safety recall presents a risk of loss of power, inability to accelerate, or sudden mechanical failure, which could increase the risk of a crash, especially during normal driving conditions such as merging, accelerating, or driving at highway speeds. The uncertainty and inconsistency regarding whether a safety recall applies to my vehicle has put my safety and the safety of others at risk. Confirmation by dealer or service center: The problem has not been repaired by a dealer, as Hyundai denied that a recall existed despite it previously appearing under my VIN on their official website. Independent service centers that recently serviced the vehicle did not identify or report any transmission warnings or failures. Inspection by manufacturer or others: The vehicle has not been physically inspected by Hyundai for this recall issue. My only interaction with the manufacturer was a phone call + email with a Hyundai case manager, who stated that no recall applied to my VIN. Warning lamps, messages, or prior symptoms: There were no warning lights, messages, or symptoms prior to this issue. The vehicle recently received routine maintenance, including an oil change, tire balancing, and tire rotation, and none of the service providers reported any problems or concerns related to the transmission or overall vehicle condition. I am 34 weeks pregnant with no way to the hospital.” (NHTSA Complaint #11711248)

Powertrain

Powertrain and transmission defects directly impair the vehicle’s core function and are generally considered substantial defects under California lemon law. Owners of the 2021 Hyundai Sonata have reported harsh shifting, shuddering, slipping, and transmission warning lights. 12 NHTSA complaints have been submitted for this defect category. Owner reports include: “The contact owns a 2021 Hyundai Sonata. The contact stated that while driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. The vehicle was driven to the shoulder of the road. The contact stated that the fuel level indicated empty, and the low fuel warning light was illuminated. The passenger seated in the rear seat noticed that the rear seat was out of place and that the seat was very hot. The vehicle was refueled prior to the failure. The contact and the other occupants in the vehicle exited the vehicle. The vehicle was towed to the residence. The dealer was made aware of the failure. The contact was informed that the failure was like the failure listed in NHTSA Campaign Number: 25V796000 (Fuel System, Gasoline). The contact was unaware of the open recall because a recall notification was not received. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was not made aware of the failure. The failure mileage was approximately 130,000.” (NHTSA Complaint #11721548)

Fuel System

Fuel and propulsion system defects can cause stalling, fuel leaks, or power loss — all substantial impairments of use and safety. The 2021 Hyundai Sonata has generated 7 NHTSA complaints for this defect category. Owner reports include: “The contact owns a 2021 Hyundai Sonata. The contact received notification of NHTSA Campaign Number: 25V796000 (Fuel System, Gasoline); and the vehicle was taken to the dealer for the recall repair; however, the dealer informed the contact that the vehicle was unrepairable, and there was no further information provided. The manufacturer was made aware of the issue, and a case was filed. The manufacturer informed the contact that the field engineers had reviewed the vehicle and advised that a buyback was the best option. Additionally, the manufacturer offered an 8 percent discount on the purchase of a new vehicle. The contact declined the offer because the vehicle had not experienced a failure, and the vehicle would be paid off after two additional payments.” (NHTSA Complaint #11725496)

Active NHTSA Recalls — 2021 Hyundai Sonata

The following 4 recalls have been issued for the 2021 Hyundai Sonata by the NHTSA or Hyundai. If your vehicle is affected, the manufacturer is required to provide a free remedy. Check your VIN at NHTSA.gov/recalls.

California Lemon Law — Song-Beverly Act

California’s Song-Beverly Consumer Warranty Act (Cal. Civ. Code §§ 1790–1795.8) is one of the strongest lemon laws in the United States. It protects buyers and lessees of new and certified pre-owned vehicles that develop substantial defects the manufacturer cannot repair after a reasonable number of attempts.

Under Cal. Civ. Code § 1793.22, a lemon law presumption is triggered when any of the following apply to your 2021 Hyundai Sonata:

• 4+ repair attempts for the same non-safety defect without resolution
• 2+ repair attempts for a defect likely to cause death or serious bodily injury
• 30+ calendar days out of service for warranty repairs (cumulative, not consecutive)

Once the presumption is triggered, the burden shifts to Hyundai to prove the vehicle is not a lemon. Under Cal. Civ. Code § 1794(d), Hyundai must pay your attorney’s fees if you prevail — meaning qualified representation costs you nothing out of pocket.

What You Can Recover

If your 2021 Hyundai Sonata qualifies as a lemon under California law, Hyundai may be legally required to:

• Repurchase your vehicle — Full refund of your down payment, all monthly payments, registration fees, and incidental costs (towing, rentals), minus a mileage offset for miles driven before the first repair attempt
• Replace your vehicle — Provide a new, comparable vehicle at no cost to you
• Pay your attorney’s fees — Under § 1794(d), Hyundai pays all legal fees if you prevail
• Civil penalty up to 2x damages — If Hyundai willfully violated the Act, courts may award double the actual damages

Steps to Protect Your 2021 Hyundai Sonata Claim

Step 1: Document every repair visit. Keep all repair orders, work orders, and dealer invoices. Each visit counts as a repair attempt, even if the dealer says nothing is wrong.

Step 2: Keep returning for repairs. You must give Hyundai a reasonable opportunity to fix the defect. Visit different authorized Hyundai dealers if needed and ask for written documentation of each visit.

Step 3: Contact a California lemon law attorney. Once you believe the threshold has been met — 4 attempts for non-safety defects, 2 for safety defects, or 30 days out of service — contact an attorney for a free case evaluation. Under § 1794(d), Hyundai pays your fees if you win.

Step 4: Send a demand letter. Your attorney will send Hyundai a formal demand letter. Most California lemon law cases resolve through negotiation without going to trial.

2021 Hyundai Sonata Lemon Law Questions

How many repair attempts qualify my 2021 Hyundai Sonata as a lemon?

Under Cal. Civ. Code § 1793.22, four or more repair attempts for the same non-safety defect, or two attempts for a safety-related defect, triggers the lemon law presumption. Additionally, 30 or more cumulative days out of service qualifies regardless of the number of repair attempts.

Does Hyundai pay my attorney fees?

Yes. Under Cal. Civ. Code § 1794(d), Hyundai is required to pay your reasonable attorney’s fees and court costs if you prevail in a lemon law claim. This means qualified lemon law representation is free to you if your case succeeds.

Can I file a lemon law claim without an active recall?

Yes. A recall is not required to file a lemon law claim. The Song-Beverly Act covers any substantial defect that impairs the use, value, or safety of the vehicle that the manufacturer cannot repair after a reasonable number of attempts. NHTSA complaints support the claim by establishing a pattern, but are not a prerequisite.

What is the time limit to file a lemon law claim for my 2021 Hyundai Sonata?

California lemon law claims are generally subject to a four-year statute of limitations from the date you discovered or should have discovered the defect. However, you must still be within the manufacturer’s original warranty period when the defect first appears. Contact an attorney promptly to preserve your rights.