• Improvements to reliability when extending the running boards on your vehicle
Chevrolet technical service bulletin 662.30 for 2026 Chevrolet Silverado 1500 and 2026 GMC Sierra 1500.
- Bulletin number
- 662.30 (662.30)
- Component
- Unknown or other
- Summary
- • Improvements to reliability when extending the running boards on your vehicle. • Improvements to start reliability and reduced check engine light activation. • Improvements to turbo system diagnostics. • Improves transmission diagnostic software. • Reduces unnecessary check engine light activations.
Vehicles covered
- Chevrolet Silverado 1500 2026 2026
- GMC Sierra 1500 2026 2026
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