• Fixes to help extend coolant valve life through diagnostic changes.
Chevrolet technical service bulletin 661.30 for 2023 Chevrolet Silverado 1500 and 2023 GMC Sierra 1500.
- Bulletin number
- 661.30 (661.30)
- Component
- Unknown or other
- Summary
- • Fixes to help extend coolant valve life through diagnostic changes.
Vehicles covered
- Chevrolet Silverado 1500 2023 2023
- GMC Sierra 1500 2023 2023
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