PSCM

DTC C0899 (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 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 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.

Diagnostic Aids

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

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6-15.0 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 12.6-15.0 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the PSCM.
2. Test for less than 1 ohm between the ground circuit terminal A X1 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminal B X1 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 8 X2 and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

5. If all circuits test normal, replace the PSCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests