C0800

DTC C0800

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 Descriptors
DTC C0800
- Device Power Circuit Voltage

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

The power steering control module (PSCM) monitors the system voltage to make sure that the voltage stays within the proper range. Damage to components, and incorrect data input can occur when the voltage is out of range. If the PSCM detects a system voltage outside an expected range, DTC C0800 will set.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

C0800

The module detects that the battery voltage is between 7.5 and 8.75 volts.

C0800

The module detects that the battery voltage is greater than 17 volts.

C0800

The module detects that the battery voltage is less than 7.5 volts.

Conditions for Clearing the DTC

* The DTC will pass when the condition for setting the DTC is no longer present.
* A history DTC will clear after 100 consecutive ignition cycles without failing the DTC.

Diagnostic Aids

* DTC C0800 could be set by overcharging with a battery charger or jump starting.
* A high or low voltage DTC in multiple modules indicates a concern in the charging system.

Reference Information
Schematic Reference

Starting and Charging Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

* Starting System Description and Operation (Description and Operation)
* Charging System Description and Operation (Description and Operation)

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 appropriate module scan tool Battery Voltage parameter. The reading should be between 12.6 and 15.0 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the module.
2. 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 ground circuit 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 and ground.

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

4. If all circuits test normal, replace the module.

Repair Instructions

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

Control Module References (Programming and Relearning) for module replacement, setup, and programming.