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GMC
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2011
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Terrain SLE, 2.4 C, AWD
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Repair and Diagnosis
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Accessories & Equipment
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Entertainment Systems
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Cellular System, Entertainment System, And Navigation System
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Diagnostic Information and Procedures
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DTC B1020
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Circuit/System Verification
Circuit/System Verification
If this DTC is retrieved as a current DTC, replace the radio/HVAC control.