• Fixes to help ensure proper functionality for transmission system
Chevrolet technical service bulletin 654.30 for 2026 Chevrolet Silverado 1500 and 2026 GMC Sierra 1500.
- Bulletin number
- 654.30 (654.30)
- Component
- Unknown or other
- Summary
- • Fixes to help ensure proper functionality for transmission system. During the update process, your radio may stay on up to 5 minutes after you exit the vehicle. This is expected behavior when an update package is onboard the vehicle. Do not service your vehicle during installation.
Vehicles covered
- Chevrolet Silverado 1500 2026 2026
- GMC Sierra 1500 2026 2026
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