2010 Cadillac Truck SRX AWD V6-3.0L Page 815
3. Test for 2-4 ohm between the control circuit terminal 3 and the ground reference circuit terminal 4.
瀚慖f not within the specified range, replace the Q49 rear differential clutch solenoid valve.
4. Replace the K47 rear differential clutch control module.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Limited Slip Differential Clutch Valve Replacement ()
* Differential Clutch Pump Replacement (See: Transmission and Drivetrain/Differential Assembly/Differential Clutch/Service and
Repair/Differential Clutch Pump Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for rear differential clutch control module
replacement, setup, and programming
C0402
DTC C0402
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 C0402 02
- Transfer Case Solenoid Valve Short to Ground
DTC C0402 04
- Transfer Case Solenoid Valve Open
DTC C0402 42
- Transfer Case Solenoid Valve Calibration Not Programmed
DTC C0402 43
- Transfer Case Solenoid Valve EEPROM Incorrect Programming
DTC C0402 4B
- Transfer Case Solenoid Valve Calibration Not Learned
DTC C0402 61
- Transfer Case Solenoid Valve Stuck
Diagnostic Fault Information
Circuit/System Description
The rear drive clutch solenoid valve is internal to the torque transfer device 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 torque transfer device. The locking level
of the torque transfer device depends on the engagement of the clutch package.
Conditions for Running the DTC
C0402 02, C0402 42, C0402 43 and C0402 4B
* The ignition is ON.
* The circuits are tested during start up of the rear differential clutch control module.
