C0845

DTC C0845

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 C0845 03
- Device Ignition 1 Circuit Voltage Below Threshold




Circuit/System Description

The power steering control module (PSCM) actively monitors the ignition voltage seen at the module, comparing the actual voltage with that reported over serial data.


Conditions for Running the DTC

Engine running


Conditions for Setting the DTC

The PSCM detects that the ignition voltage is less than 9.2 volts


Action Taken When the DTC Sets

* Active Steering is disabled.
* SERVICE STEERING SYS and/or STABILITY SECURE MODE is displayed on the DIC.



Conditions for Clearing the DTC

* A current DTC will clear on the next malfunction free ignition cycle.
* A history DTC will clear after 100 consecutive malfunction free ignition cycles.



Diagnostic Aids

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


Reference Information
Schematic Reference

Power Steering Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Active Front Steering Description and Operation (Active Front Steering 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


Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the PSCM.
2. Ignition ON, test for B+ between the ignition voltage circuit terminal 1 and ground.

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

3. If all circuits test normal, 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