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GMC
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2021
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Terrain SLT, 4WD
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Repair and Diagnosis (Single Page)
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Accessories & Equipment
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Entertainment Systems
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Active Noise Cancellation System
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Diagnostic Information and Procedures
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DTC B126F, B1277, B127C, or B127D (Amplifier)
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Conditions for Clearing the DTC
Conditions for Clearing the DTC
A current DTC clears when the self diagnostic passes on the next ignition cycle.
A history DTC clears when the ignition cycle counter reaches the reset threshold without a repeat of the malfunction.