Mike's Workshop Manuals
: Service manuals for every vehicle
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Hummer
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2009
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H3 Base, Standard
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls And Fuel - 3.7L - DTC P0324 To DTC P0446
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DTC P0641 or P0651
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DTC Descriptors
DTC Descriptors
DTC P0641
5-Volt Reference 1 Circuit
DTC P0651
5-Volt Reference 2 Circuit