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GMC
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1997
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C3500 HD 7.4 J, Automatic
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Tests W/Codes - 7.4L
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Self-Diagnostic System
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Reading Trouble Codes
Reading Trouble Codes
NOTE:
Use of Tech 1 or 2 scan tool is required to retrieve DTCs. Refer to user reference manuals supplied with scan tool.