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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 350 (Rear Drive Axle) >> Diagnostic Information and Procedures >> DTC C12A1 or C12A9: Right/Left Rear Differential Clutch Solenoid Valve Control Circuit (G99) >> Circuit/System Description

Circuit/System Description

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The right and left rear differential clutch solenoid valves are an electro-hydraulic valve used to relieve pressure in the hydraulic system for safety reasons. When the valves are energized, the valves are closed and hydraulic pressure can be accumulated. When the valves are de-energized, the valves are open and it is not possible to build hydraulic pressure.

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