PSCM

DTC C0900 (PSCM)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC C0900 00
- Device Voltage High - PSCM

Diagnostic Fault Information






Typical Scan Tool Data






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

The ignition is ON.

Conditions for Setting the DTC

Power steering system voltage is greater than 16 volts for 1 second.

Action Taken When the DTC Sets

* The PSCM is disabled.
* No steering assist is provided.
* The driver information center (DIC) displays the POWER STEERING message.

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.

Reference Information
Schematic Reference

Power Steering Schematics Electrical Diagrams
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

Power Steering System Description and Operation (Electronic Power Steering) Power Steering System (Electronic Power Steering)Power Steering System Description and Operation (Hydraulic Power Steering) Power Steering System (Hydraulic Power Steering)
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

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 Verification Tests after completing the diagnostic procedure.

Control Module References Programming and Relearning for PSCM replacement, setup, and programming.