Brightdrop Zevo 400 2024–2026 — technical service bulletin
Bulletin PIT6411B · NHTSA communication 11023903 · issued Oct 1, 2025
Technical service bulletin
communication type
Unknown OR Other
component
2024–2026
model years
33
vehicle entries
Official summary
This information provides software update information for the K73 Telematics module to correct the symptoms described.
Vehicles covered
- 2024 Brightdrop Zevo 400
- 2025 Buick Envision
- 2026 Buick Envision
- 2025 Cadillac CT5
- 2026 Cadillac CT5
- 2025 Cadillac Lyriq
- 2026 Cadillac Lyriq
- 2025 Cadillac Optiq
- 2026 Cadillac Optiq
- 2025 Cadillac XT4
- 2026 Cadillac XT4
- 2025 Chevrolet Blazer
- 2026 Chevrolet Blazer EV
- 2025 Chevrolet Brightdrop 400
- 2026 Chevrolet Brightdrop 400
- 2026 Chevrolet Brightdrop 600
- 2025 Chevrolet Colorado
- 2026 Chevrolet Colorado
- 2025 Chevrolet Equinox
- 2026 Chevrolet Equinox
- 2025 Chevrolet Equinox EV
- 2026 Chevrolet Equinox EV
- 2025 Chevrolet Silverado EV
- 2026 Chevrolet Silverado EV
- 2025 Chevrolet Traverse
- 2026 Chevrolet Traverse
- 2026 GMC Acadia
- 2025 GMC Canyon
- 2026 GMC Canyon
- 2025 GMC Sierra EV
- 2026 GMC Sierra EV
- 2025 GMC Terrain
- 2026 GMC Terrain
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.