Operation CHARM
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Hummer
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2004
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H2 V8-6.0L
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Repair and Diagnosis
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Accessories and Optional Equipment
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Radio, Stereo, and Compact Disc
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Testing and Inspection
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Symptom Related Diagnostic Procedures
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Radio Displays LOC, LOCKED, or CODE
Radio Displays LOC, LOCKED, or CODE
Steps 1-5: