2023 Sierra/Sierra Denali 2500 HD/3500 HDScan to Access
United States
United States and Canada
Connected Services1-888-4-ONSTAR Customer Assistance
1-800-263-3777
Canada
• Owner’s Manuals
• Warranty Information
• Connected Services
• My GMC Rewards
• myGMC Mobile App
• How-To Videos
• Vehicle Diagnostics
• Scheduled Maintenance
• Vehicle Features
• Many Additional Resources
United States
Customer Assistance 1-800-462-8782
Roadside Assistance 1-888-881-3302
84883882 A
Sierra/Sierra Denali
2500 HD/3500 HD
Owner’s Manual
Roadside Assistance1-800-268-6800
Canada
C
M
Y
CM
MY
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CMY
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