2010 Cadillac Truck SRX AWD V6-3.0L Page 822
components must be replaced as a matched set.
1. Ignition OFF, disconnect the X2 harness connector at the K47 rear differential clutch control module.
2. Test for infinite resistance between the differential clutch pump control circuit terminal 1 and ground.
瀚慖f less than the specified value, replace the M32 differential clutch pump.
3. Test for 1.5-20 ohm between the control circuit terminal 1 and the low reference circuit terminal 2.
瀚慖f not within the specified range, replace the M32 differential clutch pump.
4. Replace the K47 rear differential clutch control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Differential Clutch Pump Replacement (See: Transmission and Drivetrain/Differential Assembly/Differential Clutch/Service and
Repair/Differential Clutch Pump Replacement)
* Differential Carrier Assembly Replacement ()
* Control Module References (See: Testing and Inspection/Programming and Relearning) for module replacement, setup, and programming
C0408
DTC C0408
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC C0408 02
- Rear Axle Coupling Solenoid Valve Short to Ground
DTC C0408 04
- Rear Axle Coupling Solenoid Valve Open
DTC C0408 42
- Rear Axle Coupling Solenoid Valve Calibration Not Programmed
DTC C0408 43
- Rear Axle Coupling Solenoid Valve EEPROM Incorrect Programming
DTC C0408 4B
- Rear Axle Coupling Solenoid Valve Calibration Not Learned
DTC C0408 61
- Rear Axle Coupling Solenoid Valve Stuck
Diagnostic Fault Information
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.
