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January 7, 2026 Over-the-air update

• Improvements to battery health diagnostics

Chevrolet technical service bulletin 653.20 for 2024-2026 Chevrolet Blazer EV.

Bulletin number
653.20 (653.20)
Component
Unknown or other
Summary
• Improvements to battery health diagnostics. • Fixes for efficiency when using fast charging stations. • Improvements to reliability for climate control and charging. • Improvements to the accuracy of efficiency values. • Improvements to shifting. • Fixes to protect battery health and adjust charge limits.

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