Brightdrop Zevo 600 2021–2026 — technical service bulletin
Bulletin PIT6369B · NHTSA communication 11027615 · issued Jan 10, 2026
Technical service bulletin
communication type
Unknown OR Other
component
2021–2026
model years
52
vehicle entries
Official summary
This Preliminary information communicates to dealership technicians to perform the reset for the 2 modules noted above.
Vehicles covered
- 2023 Brightdrop Zevo 600
- 2023 Buick Encore
- 2024 Buick Encore
- 2025 Buick Encore
- 2026 Buick Encore
- 2021 Buick Envision
- 2022 Buick Envision
- 2023 Buick Envision
- 2021 Cadillac CT4
- 2022 Cadillac CT4
- 2023 Cadillac CT4
- 2024 Cadillac CT4
- 2025 Cadillac CT4
- 2026 Cadillac CT4
- 2021 Cadillac CT5
- 2022 Cadillac CT5
- 2023 Cadillac CT5
- 2024 Cadillac CT5
- 2021 Cadillac Escalade
- 2022 Cadillac Escalade
- 2023 Cadillac Escalade
- 2024 Cadillac Escalade
- 2021 Cadillac Escalade Esv
- 2022 Cadillac Escalade Esv
- 2023 Cadillac Escalade Esv
- 2024 Cadillac Escalade Esv
- 2023 Chevrolet Corvette
- 2024 Chevrolet Corvette
- 2025 Chevrolet Corvette
- 2022 Chevrolet Silverado 1500
- 2023 Chevrolet Silverado 1500
- 2022 Chevrolet Suburban 1500
- 2023 Chevrolet Suburban 1500
- 2024 Chevrolet Suburban 1500
- 2022 Chevrolet Tahoe
- 2023 Chevrolet Tahoe
- 2024 Chevrolet Tahoe
- 2025 Chevrolet Tahoe
- 2022 GMC Hummer EV Pickup
- 2023 GMC Hummer EV Pickup
- 2024 GMC Hummer EV Pickup
- 2025 GMC Hummer EV Pickup
- 2024 GMC Hummer EV SUV
- 2025 GMC Hummer EV SUV
- 2022 GMC Sierra 1500
- 2023 GMC Sierra 1500
- 2022 GMC Yukon
- 2023 GMC Yukon
- 2024 GMC Yukon
- 2022 GMC Yukon XL
- 2023 GMC Yukon XL
- 2024 GMC Yukon XL
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.