Toyota Avalon Hybrid 2021 — technical service bulletin
Bulletin T-SB-0040-20 Rev · NHTSA communication 10177586 · issued Jun 8, 2020
Technical service bulletin
communication type
Electrical System
component
2021
model years
10
vehicle entries
Official summary
TSB: Hybrid vehicles are equipped with two types of batteries: ?Hybrid Vehicle (HV) battery ?Auxiliary (12V) battery If the hybrid vehicle is put into storage, the State-Of-Charge (SOC) of its HV battery and auxiliary battery will gradually decrease. To prevent the auxiliary battery from becoming discharged during storage, proper maintenance is necessary.
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.