• Improvements to the performance of vehicle software updates
GMC technical service bulletin 661.20 for 2026 GMC Hummer EV SUV and 2026 GMC Hummer EV Pickup.
- Bulletin number
- 661.20 (661.20)
- Component
- Unknown or other
- Summary
- • Improvements to the performance of vehicle software updates. • Fixes to help prevent loss of functionality for connectivity features, including maps and Wi-Fi. • Fixes to help prevent erroneous emergency calls from vehicle. • Fixes to help ensure proper functionality for mobile app features. • Improvements to the performance of Super Cruise.
Vehicles covered
- GMC Hummer EV SUV 2026 2026
- GMC Hummer EV Pickup 2026 2026
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