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Home >> GMC >> 2021 >> Terrain SLT, 4WD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Active Noise Cancellation System >> Diagnostic Information and Procedures >> DTC B126F, B1277, B127C, or B127D (Amplifier) >> Conditions for Running the DTC

Conditions for Running the DTC

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