Hyundai Elantra Hybrid 2020–2023 — service campaign
Bulletin 24-01-054H · NHTSA communication 11006056 · issued Jul 9, 2024
Service campaign
communication type
Electrical System
component
2020–2023
model years
6
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). Follow the procedure in TSB 24-01-054H (or latest version) to perform the update the Battery management System (BMS) software.
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.