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January 31, 2022 Service bulletin

This technical bulletin provides repair information to correct a customer concern of Flutter or Boom Noise...

Chevrolet technical service bulletin 20NA165 for 2021 Chevrolet Trailblazer and 2021 Buick Encore GX.

Bulletin number
20NA165
Component
Engine and engine cooling: engine: engine control module (ecu/ECM): software
Summary
This technical bulletin provides repair information to correct a customer concern of Flutter or Boom Noise at 1200 RPM- Service Calibration.

Owners of these vehicles have filed 60 complaints in the engine category.

Vehicles covered

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