Brightdrop Zevo 400 2022–2026 — technical service bulletin
Bulletin PIP5981G · NHTSA communication 11025581 · issued Nov 13, 2025
Technical service bulletin
communication type
Unknown OR Other
component
2022–2026
model years
36
vehicle entries
Official summary
This Preliminary information communicates ordering process for the front and rear drive units are on restriction for all listed EV vehicles for engineering review.
Vehicles covered
- 2024 Brightdrop Zevo 400
- 2023 Brightdrop Zevo 600
- 2024 Brightdrop Zevo 600
- 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 Optiq
- 2026 Cadillac Vistiq
- 2024 Chevrolet Blazer EV
- 2025 Chevrolet Blazer EV
- 2026 Chevrolet Blazer EV
- 2025 Chevrolet Brightdrop 400
- 2026 Chevrolet Brightdrop 400
- 2026 Chevrolet Brightdrop 600
- 2024 Chevrolet Equinox EV
- 2025 Chevrolet Equinox EV
- 2026 Chevrolet Equinox EV
- 2024 Chevrolet Silverado EV
- 2025 Chevrolet Silverado EV
- 2026 Chevrolet Silverado EV
- 2022 GMC Hummer EV Pickup
- 2023 GMC Hummer EV Pickup
- 2024 GMC Hummer EV Pickup
- 2025 GMC Hummer EV Pickup
- 2026 GMC Hummer EV Pickup
- 2024 GMC Hummer EV SUV
- 2025 GMC Hummer EV SUV
- 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.