Technical Service Bulletin 654.30 — 2026 GMC SIERRA 1500
UNKNOWN OR OTHER
Bulletin Details
| TSB ID | 654.30 |
| Manufacturer | |
| Vehicle | 2026 GMC SIERRA 1500 |
| Component | UNKNOWN OR OTHER |
| Communication Date |
Bulletin 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.
About Technical Service Bulletins
A Technical Service Bulletin (TSB) is a document issued by a vehicle manufacturer to its dealers, describing a known issue with a specific vehicle or set of vehicles and the recommended procedure to fix it. Unlike recalls, TSBs are not mandatory and are typically only performed if an owner reports the related issue. However, TSBs can be an indicator of common problems with a vehicle.