2010 Cadillac Truck SRX AWD V6-3.0L Page 819
DTC Descriptor
DTC C0406 0B
- Transfer Case Solenoid Valve Control Circuit High Current
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
The ignition is ON.
Conditions for Setting the DTC
* The rear differential clutch control module detects a short to ground on the control circuit of the rear drive clutch solenoid valve.
* The rear differential clutch control module detects a current more than 11 A on the control circuit of the rear drive clutch solenoid valve.
Action Taken When the DTC Sets
One or more of the following actions may occur:
* All-wheel drive (AWD) is disabled.
* Service Rear Axle is displayed on the driver information center.
Conditions for Clearing the DTC
* The condition for setting the DTC is no longer present.
* The DTC is not detected in 40 consecutive ignition cycles.
Reference Information
Schematic Reference
Rear Axle Schematics (See: Transmission and Drivetrain/Differential Assembly/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Rear Drive Axle Description and Operation (See: Transmission and Drivetrain/Differential Assembly/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Engine running, observe the scan tool Rear Drive Clutch Status parameter. The scan tool should display TEMPORARILY LIMITED when
