Service Information

Spark

DTC C0800

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0800 03: Power Supply Circuit Low Voltage

DTC C0800 07: Power Supply Circuit High Voltage

Circuit Description

The electronic brake control module (EBCM) monitors the voltage level available for system operation. A low voltage condition prevents the system from operating correctly.

If the voltage level is too high, damage may result in the system. When the EBCM detects a high voltage condition, the EBCM turns OFF the system relay which removes battery voltage from the solenoid valves and pump motor.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

C0800 03

One of the following conditions exists for 0.5 seconds:

•	When the system is inactive, the system voltage is less than 8.8 volts.

•	When the system is active or stationary, the system voltage is less than 8.4 volts.

C0800 07

One of the following conditions exists:

•	When the system is inactive, the system voltage is greater than 17 volts for 2 seconds.

•	When the system is active or stationary, the system voltage is greater than 19 volts for 0.5 seconds.

Action Taken When the DTC Sets

•	The EBCM disables the Antilock Brake System (ABS)/traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.

•	The ABS indicator turns ON.

•	The BRAKE Warning indicator turns ON.

Conditions for Clearing the DTC

•	The EBCM will automatically delete the DTC C0800 03 when the fault condition is recovered.

•	The DTC is not deleted even though low voltage condition disappeared during control.

Diagnostic Aids

•	Test the charging system. Refer to Charging System Test .

•	Possible causes of this DTC are the following conditions:

—	A charging system malfunction

—	Too much battery draw

—	A weak battery

—	A faulty system ground

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

With scan tool installed, clear the DTCs then drive the vehicle in a straight line at a speed greater than 20 km/h (13 mph).

Circuit/System Testing

Measure the voltage at the battery terminals.
With a scan tool, observe the Switched System Battery Voltage parameter in the ABS data list. Verify that battery terminal voltage and ignition voltage readings do not differ more than 1 volt.

⇒	If more than 1 volt, test the ground circuit of the EBCM for high resistance. If the circuit tests normal, test or replace the EBCM.

Start the engine and allow to tick over, using a scan tool check if DTC is set to current.

⇒	If the DTC is set to current, continue next step.

Ignition OFF, disconnect the EBCM harness connector.
Test for less than 1 ohm of resistance between the ground circuit terminals and ground.

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

Connect a DMM between the supply voltage circuit terminals and the ground circuit terminals.

⇒	If 12 volts is present, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Electronic Brake Control Module Replacement