NHTSA ID Number: 10183198 Manufacturer Communication Number: 20NA196 Summary This service bulletin provides information and a service procedure for dealers/technicians on OnStar Over the Air Update for TTY / TDD Operation and Continuous Improvement Changes.       SEOCONTENT-START Copyright 2020 General Motors LLC. All Rights Reserved. Service Bulletin Bulletin No.: 20-NA-196 Date: November, 2020 TECHNICAL Subject: ... Read more

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