• Improvements to the performance of Brake Assist
GMC technical service bulletin 661.40 for 2026 GMC Hummer EV SUV and 2026 GMC Hummer EV Pickup.
- Bulletin number
- 661.40 (661.40)
- Component
- Unknown or other
- Summary
- • Improvements to the performance of Brake Assist. • Fixes to help ensure proper Super Cruise lane change functionality.
Vehicles covered
- GMC Hummer EV SUV 2026 2026
- GMC Hummer EV Pickup 2026 2026
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