PSCM
DTC C0900 (PSCM)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC C0900 00
- Device Voltage High
Diagnostic Fault Information
Circuit/System Description
The power steering control module (PSCM) monitors the amount of battery voltage available to it. If the voltage is too high, then the PSCM sets DTC C0900 00 and disables itself in order to protect itself against high voltage damage.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
Power steering system voltage is greater than 16 volts for 1 second.
Action Taken When the DTC Sets
* DTC C0900 00 is stored in memory.
* The DIC displays the POWER STEERING warning message.
* The PSCM is disabled.
* No steering assist is provided.
Conditions for Clearing the DTC
* A current DTC will clear when the power steering system voltage returns to less than 16 volts.
* A history DTC will clear after 100 consecutive ignition cycles from when power steering system voltage is less than 16 volts.
Diagnostic Aids
* A possible cause of this DTC could be overcharging with a battery charger or jump starting.
* A high voltage DTC in multiple modules indicates a concern in the charging system.
Circuit/System Verification
1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.
• If not within the specified range, refer to Charging System Test. Charging System Test
2. Observe the scan tool PSCM Battery Voltage Signal parameter. The reading should be between 12.6 and 15.0 volts.
If not within the specified range, replace the PSCM.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests