PSCM

DTC C0899 (PSCM)

Diagnostic Instructions

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



DTC Descriptor
DTC C0899 03
- Device Voltage Low




Diagnostic Fault Information






Circuit/System Description

The power steering control module (PSCM) monitors the battery voltage available in order to ensure the power steering system has adequate voltage levels to perform the system functions.


Conditions for Running the DTC

Ignition is ON.


Conditions for Setting the DTC

Power steering system voltage is less than 9 volts for 1 second.


Action Taken When the DTC Sets

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



Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The PSCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive ignition cycles.



Reference Information
Schematic Reference

Power Steering Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

* Power Steering System Description and Operation (HPS) (Power Steering System Description and Operation (HPS))Power Steering System Description and Operation (EPS) (Power Steering System Description and Operation (EPS))
* Charging System Description and Operation (Description and Operation)

Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


Diagnostic Aids

A low voltage DTC in multiple modules indicates a concern in the charging system.


Circuit/System Testing

1. Measure and record the voltage at the battery terminals. Observe the Battery Voltage Signal parameter. Verify that battery terminal voltage and battery voltage signal readings do not differ greater than 1 volt.

• If the difference is greater than 1 volt, test the battery positive voltage and ground circuits of the PSCM for an open/high resistance, or replace the PSCM.

2. Go to Charging System Test (Charging System Test).



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