2021 Hyundai Elantra Hybrid electrical system problems
11 owner complaints filed with NHTSA name the electrical system on the 2021 Hyundai Elantra Hybrid — 38% of all complaints for this model 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…”
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…”
filed Jul 9, 2025
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related recalls
- A software error in the motor control unit may cause unintended vehicle acceleration…Campaign 23V589000 · Aug 18, 2023
Related service bulletins
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, 2025Certain 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, 2025Certain 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, 2025This 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
Electrical System problems in other Elantra Hybrid years
| Year | Reports | Share |
|---|---|---|
| 2023 Elantra Hybrid | 17 | 32% |
| 2022 Elantra Hybrid | 12 | 31% |
Other reported problem areas on the 2021 Hyundai Elantra Hybrid
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.