Diagnostic Instructions
DTC Descriptor
DTC C0899 00: Power Supply Circuit Low 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.
Conditions for Running the DTC
| • | The vehicle speed is greater than 8 km/h (5 mph). |
Conditions for Setting the DTC
One of the following conditions exists for 0.72 seconds:
| • | During initialization or when the system is inactive, the system voltage
is less than 9.6 volts. |
| • | During the system operation, the system voltage is less than 9.3 volts. |
Action Taken When the DTC Sets
| • | The EBCM disables the Antilock Brake System (ABS)/Traction Control System
(TCS)/Electronic Stability Control (ESP)/Electronic Brake Distribution (EBD) for the
duration of the ignition cycle. |
| • | The multi function display (MFD) displays the ABS Fault message. |
| • | The multi function display (MFD) displays the Traction Ctrl Off message. |
| • | The multi function display (MFD) displays the Stability Ctrl Off message. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present. |
| • | The DTC can be cleared using a scan tool. |
Diagnostic Aids
| • | Possible causes of this DTC are the following conditions: |
| - | A charging system malfunction |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Scan Tool Reference
Control Module References
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 test normal, test or replace the EBCM. |
Repair Instructions
