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GMC
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2010
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Acadia SLT, AWD
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System & Fuel System - 3.6L - DTC P0638 To DTC P2635
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DTC P0856
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Conditions for Setting the DTC
Conditions for Setting the DTC
The ECM detects an invalid signal from the EBCM.