• Improvements to help protect battery health in low temperatures
GMC technical service bulletin 661.10 for 2026 GMC Hummer EV SUV and 2026 GMC Hummer EV Pickup.
- Bulletin number
- 661.10 (661.10)
- Component
- Unknown or other
- Summary
- • Improvements to help protect battery health in low temperatures. • Improvements to diagnostics to reduce service messages. • Fixes to help protect battery health in high temperatures. • Fixes to improve responsiveness for vehicle diagnostics.
Vehicles covered
- GMC Hummer EV SUV 2026 2026
- GMC Hummer EV Pickup 2026 2026
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