Hyundai Elantra Hybrid 2020–2024 — service campaign
Bulletin 25-01-010H-1 DN · NHTSA communication 11020799 · issued Jul 16, 2025
Service campaign
communication type
Electrical System
component
2020–2024
model years
9
vehicle entries
Official summary
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 Board has determined that these vehicles may be releasing air pollutants which exceed Federal and California standards.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.