Hyundai Elantra Hybrid 2020–2024 — service campaign
Bulletin 25-01-010H-1 9B4 OL · NHTSA communication 11022097 · issued Aug 21, 2025
Service campaign
communication type
Electrical System
component
2020–2024
model years
9
vehicle entries
Official summary
Certain Hyundai vehicles may exhibit a warning light with Diagnostic Trouble Code (“DTC”) P1BB20 due to a battery over voltage condition.
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.