2021 Hyundai Elantra Hybrid problems & reliability
29 owner complaints filed with NHTSA for the 2021 Hyundai Elantra Hybrid, alongside 4 safety recall campaigns. Last verified Aug 7, 2026. Complaints are unverified reports submitted by owners to the federal Office of Defects Investigation.
Each complaint is counted once (by NHTSA case number), even when it names several vehicles.
Most reported problems
| Component | Complaints | Share |
|---|---|---|
| Electrical System → | 11 | 38% |
| Vehicle Speed Control → | 10 | 34% |
| Engine | 8 | 28% |
| Service Brakes | 5 | 17% |
| Unknown OR Other | 4 | 14% |
| Forward Collision Avoidance | 3 | 10% |
| Fuel/propulsion System | 3 | 10% |
| Exterior Lighting | 1 | 3% |
| Power Train | 1 | 3% |
| Suspension | 1 | 3% |
Component groups as classified by NHTSA. A complaint can name more than one component, so shares may sum to more than 100%.
Complaints by incident year
What owners report
“The contact owns a 2021 Hyundai Elantra Hybrid. The contact stated that while driving 60 MPH during ice and snow, the engine revved, and there was an abnormal sound coming from the Hybrid battery. While turning, the contact stated that the vehicle had unintendedly accelerated. Additionally, the tire pressure warning…”
Electrical System · filed Jan 2, 2026
“The headlights and back lights turn off at random times when the headlights are on the automatic setting. This problem happens very frequently at night, putting my family at risk when the lights go off and cannot see what is ahead of us. In addition to a cop pulling me over for not having my lights on and he asked me…”
Exterior Lighting · filed Jul 9, 2025
“Check Hybrid System alarmed in heavy traffic and derated my car and put me in a very dangerous situation.”
Power Train · filed Jul 3, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Technical service bulletins
44 manufacturer communications (TSBs, service campaigns, warranty extensions) are on file with NHTSA for the 2021 Hyundai Elantra Hybrid. The 10 most recent:
The National Highway Traffic Safety Administration (NHTSA) has identified the presence of substandard and dangerous driver’s-side airbag inflators manufactured by Jilin Province Detiannuo Automobile Safety System Co.…
DTN DL · Other · issued Apr 10, 2026
The National Highway Traffic Safety Administration (NHTSA) has issued an urgent safety advisory regarding dangerous, counterfeit driver‑side airbag inflators manufactured by Jilin Province Detiannuo Automobile Safety…
DTN DCS · Other · issued Apr 10, 2026
Some 2019MY and newer vehicles equipped with a front view camera may illuminate certain warning lights and trigger DTC C272246 fault code for the front camera. In the following cases, the front camera auto-calibration…
26-AD-001H TSB · Service Bulletin/Repair Instructions · issued Feb 25, 2026
This bulletin provides information regarding condensation related to the accumulated moisture in the headlamp, rear combination lamp, daytime running lamp (DRL), or fog lamp. This TSB illustrates the various causes of…
25-BD-012H TSB · Service Bulletin/Repair Instructions · issued Nov 6, 2025
This bulletin provides information related to the changes introduced in the 2025 1st Navigation Map and Software Update. The changes may vary depending on vehicle type, model, and navigation system as described in this…
25-BE-020H TSB · Service Bulletin/Repair Instructions · issued Sep 30, 2025
Certain Hyundai vehicles may exhibit a warning light with Diagnostic Trouble Code (“DTC”) P1BB20 due to a battery over voltage condition.
25-01-010H-1 9B4 OL · Service Campaign · issued Aug 21, 2025
Certain Elantra Hybrid (CN7 HEV), Sonata Hybrid (DN8 HEV), and Tucson Hybrid (NX4 HEV) vehicles may exhibit a warning light due to DTC Code P1BB20 (12V Lithium Battery Cell Voltage High). The California Air Resources…
25-01-010H-1 DN · Service Campaign · issued Jul 16, 2025
This bulletin provides the procedure to update the software for the Battery Management System (BMS) on certain Elantra Hybrid (CN7 HEV), Sonata Hybrid (DN8 HEV), and Tucson Hybrid (NX4 HEV) vehicles that may exhibit a…
25-01-010H-1 TSB · Service Campaign · issued Jul 16, 2025
Certain 2021 – 2025 model year Elantra, 2022 – 2025 model year Elantra N and 2021 – 2025 model year Elantra Hybrid vehicles may experience an inoperable horn. Hyundai is extending the warranty coverage for the Horn…
25-BE-005H-2 OL · Warranty Program/Extension · issued Jun 16, 2025
Certain Elantra (CN7) non-N-Line and N-Line, Elantra (CN7A), Elantra N (CN7 N), and Elantra Hybrid (CN7 HEV) vehicles may experience an inoperable horn. Hyundai is extending the warranty coverage for the horn…
25-BE-005H-2 TSB · Warranty Program/Extension · issued May 17, 2025
TSBs are repair guidance manufacturers send to dealers — they are not recalls and repairs are not automatically free. Full documents are available on NHTSA’s site.
Safety recalls
The 2021 Hyundai Elantra Hybrid has 4 NHTSA recall campaigns — recall repairs are free at franchised dealers regardless of the vehicle’s age.
Check whether your specific vehicle is affected
Recall campaigns often cover only certain VIN ranges. Enter your VIN on the official NHTSA site to confirm whether your vehicle is included and whether the repair is still open.
Check VIN on NHTSA →Buying a used 2021 Hyundai Elantra Hybrid?
- · Decode the seller’s VIN with our free VIN decoder to confirm the exact year, engine and trim.
- · Check for unrepaired recalls by VIN on NHTSA’s official lookup — recall repairs are free.