Brightdrop 600 Elcv 2023–2026 — technical service bulletin
Bulletin PIT6424 · NHTSA communication 11022134 · issued Aug 21, 2025
Technical service bulletin
communication type
Unknown OR Other
component
2023–2026
model years
28
vehicle entries
Official summary
A vehicle may come in with B3A6B set in history. Tech is directed to clear code and advise the customer an OTA will be released for the code.
Vehicles covered
- 2024 Brightdrop 600 Elcv
- 2024 Brightdrop Zevo 400
- 2025 Cadillac Celestiq
- 2025 Cadillac Escalade IQ
- 2026 Cadillac Escalade IQ
- 2026 Cadillac Escalade Iql
- 2023 Cadillac Lyriq
- 2024 Cadillac Lyriq
- 2025 Cadillac Lyriq
- 2026 Cadillac Lyriq
- 2025 Cadillac Optiq
- 2026 Cadillac Vistiq
- 2024 Chevrolet Blazer EV
- 2025 Chevrolet Blazer EV
- 2025 Chevrolet Brightdrop 400
- 2025 Chevrolet Brightdrop 600
- 2024 Chevrolet Equinox EV
- 2025 Chevrolet Equinox EV
- 2024 Chevrolet Silverado EV
- 2025 Chevrolet Silverado EV
- 2026 Chevrolet Silverado EV
- 2024 GMC Hummer EV Pickup
- 2025 GMC Hummer EV Pickup
- 2026 GMC Hummer EV Pickup
- 2026 GMC Hummer EV SUV
- 2024 GMC Sierra EV
- 2025 GMC Sierra EV
- 2026 GMC Sierra EV
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.