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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Drivelines & Axles >> Differentials & Drive Axles >> Rear Drive Axle >> Diagnostic Information and Procedures >> DTC C0408: Rear Axle Coupling Solenoid Valve >> Circuit/System Description

Circuit/System Description

The rear differential clutch solenoid valve is mounted on the rear of the differential housing. The Rear Differential Clutch Control Module supplies battery voltage to the control circuit and ground to the low reference circuit of the solenoid valve. The solenoid valve is controlled by a pulse width modulation (PWM) signal. The solenoid valve controls the hydraulic pressure to the clutch package of the limited slip differential. The locking level of the limited slip differential depends on the engagement of the clutch package.