C0800

DTC C0800

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 Descriptors
DTC C0800 03
- Device Power Circuit Voltage Below Threshold


DTC C0800 07
- Device Power Circuit Voltage Above Threshold


DTC C0800 12
- Device Power Circuit Voltage Below Minimum Threshold




Diagnostic Fault Information






Circuit Description

The power steering control module (PSCM) has a discrete battery positive voltage supply circuit. The PSCM monitors the voltage level on this circuit to ensure the electric power steering (EPS) system has adequate voltage levels to perform the system functions.


Conditions for Running the DTC

The engine is running.


Conditions for Setting the DTC

The PSCM detects that the battery voltage is less than 9.55 volts or greater than 17.5 volts.


Action Taken When the DTC Sets

Steering assist is reduced.


Conditions for Clearing the DTC

* The DTC will pass when EPS system voltage is 9.5-17.5 volts.
* A history DTC will clear after 100 consecutive ignition cycles with EPS system voltage between 9.5-17.5 volts.



Reference Information
Schematic Reference

Power Steering Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

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


Circuit/System Testing

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. Ignition OFF, disconnect the harness connectors at the PSCM.
3. With the ignition OFF and the scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 5 ohms between the following ground circuit terminals and ground:

* Terminal 2 X1 (L61/LE5)
* Terminal 2 X5 (LNF)


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

4. Verify that a test lamp illuminates between the following B+ circuit terminals and ground:

* Terminal 1 X1 (L61/LE5)
* Terminal 1 X5 (LNF)


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

5. Ignition ON, verify that a test lamp illuminates between the following ignition circuit terminals and ground:

* Terminal 6 X2 (L61/LE5)
* Terminal 6 X4 (LNF)


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

6. 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.