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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 328 (Active Noise Cancellation System) >> Diagnostic Information and Procedures >> DTC B1277, B127C, B127D, or B126F: Microphone Input Signal >> Conditions for Running the DTC

Conditions for Running the DTC

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.

The Audio Amplifier performs a self diagnostic of the microphone circuits 16 seconds after initial power up, then periodically every 400 milliseconds thereafter.

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