Antilock Brakes / Traction Control Systems
DTC C0899
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 properly.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0899 Device {single or 1} Voltage Low
Conditions for Running the DTC
* The vehicle speed is greater than 8 km/h (5 mph).
* The system relay is commanded ON.
Conditions for Setting the DTC
One of the following conditions exists for 0.72 second:
* During initialization or when the system is inactive, the system voltage is less than 10.8 volts.
* During the system operation, the system voltage is less than 9.0 volts.
Action Taken When the DTC Sets
If equipped, the following actions occur:
* The EBCM disables the antilock brake system (ABS)/adaptive cruise control (ACC)/variable effort steering (VES)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
* The ABS indicator turns ON.
* The Traction Control indicator turns ON.
* The driver information center (DIC) displays the Service Stabilitrak and Service ABS messages.
* The dynamic rear proportion (DRP) and traction control system (TCS) are degraded.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present and the DTC is cleared with a scan tool.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
* Test the charging system.
* Possible causes of this DTC are the following conditions:
- A charging system malfunction
- An excessive battery draw
- A weak battery
- A faulty system ground
Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. Use the scan tool in order to inspect the voltage to the EBCM.
5. Verifies that the condition is still present.
