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Home >> GMC >> 2019 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transmission - 6T50 (M2D) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P171D >> Circuit/System Description

Circuit/System Description

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The solenoid valve directs pressurized fluid to exit the accumulator to apply the clutches for a 1st gear start, during an Auto Start event.

DTC P171D sets only when there is a hydraulic/mechanical problem.

For an overview of the component/system, refer to:

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