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2021
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Sierra 2500 HD AT4, 6.6L Eng VIN 7
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Repair and Diagnosis
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Body & Frame
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Body, Cab Control Systems
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Secondary And Configurable Customer Controls
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Diagnostic Information and Procedures
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Drive Mode Switch Malfunction
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DTC Descriptor
DTC Descriptor
DTC B074C
Drive Mode Select Switch Indicator Circuit 3
Symptom Byte Information:
Symptom Byte List