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GMC Truck
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1992
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Suburban 1/2 Ton 2WD V8-350 5.7L
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Repair and Diagnosis
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A L L Diagnostic Trouble Codes ( DTC )
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Testing and Inspection
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Manufacturer Code Charts
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DTC 66
DTC 66
4WAL Codes 65 And 66 (Open Or Shorted Motor Relay).:
