C0408 BUICK - Rear Axle Coupling Solenoid Valve
- Faulty Rear Axle Coupling Solenoid Valve
- Rear Axle Coupling Solenoid Valve harness is open or shorted
- Rear Axle Coupling Solenoid Valve circuit poor electrical connection
- Anti-Lock Brake System (ABS) Warning Light ON
- Engine Light ON (or Service Engine Soon Warning Light)
C0408 Buick DescriptionThe 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.
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