2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 825
DTC C0450 04
- Steering Assist Control Solenoid Valve Circuit Open
DTC C0450 08
- Steering Assist Control Solenoid Valve Circuit Performance - Signal Invalid
DTC C0450 0B
- Steering Assist Control Solenoid Valve Circuit High Current
Diagnostic Fault Information
Circuit/System Description
The electronic brake control module (EBCM) controls the current through the variable effort steering actuator located on the steering gear. The
current used to control the actuator is between 0-1 A. At low speeds and in parking lot maneuvers the current is applied to the actuator causing the
orifice to open increasing fluid flow and reducing the steering effort. At high speeds the orifice is commanded closed by reducing current through
the actuator and restricting fluid flow increasing steering effort. The EBCM monitors and compares the commanded and feedback current
parameters to detect malfunctions in the variable effort steering system.
Conditions for Running the DTC
* Ignition ON.
* Ignition voltage is greater than 8 volts.
Conditions for Setting the DTC
A malfunction, open/high resistance, a invalid signal or a high current is detected on the high control or low control circuit.
Action Taken When the DTC Sets
* The driver information center displays SERVICE POWER STEERING SYSTEM.
* The variable effort steering system is disabled for the remainder of the ignition cycle.
Conditions for Clearing the DTC
* The condition for setting the DTC is no longer present and the DTC is cleared with a scan tool.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
The vehicle may need to be driven to view full actuator commanded and actuator feedback data parameters.
Reference Information
Schematic Reference
Power Steering Schematics (See: Steering and Suspension/Steering/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Variable Effort Steering System Description and Operation (See: Steering and Suspension/Steering/Description and Operation/Variable Effort
Steering System)
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)
