Chevrolet Bolt EV 2017–2019 — technical service bulletin
Bulletin N21234575001 · NHTSA communication 10214723 · issued Dec 16, 2021
Technical service bulletin
communication type
Electrical System
component
2017–2019
model years
3
vehicle entries
Official summary
High Voltage Battery Software Update
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.