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 Voltage Low
Conditions for Running the DTC
The system relay is commanded ON.
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 10.5 volts.
* During the system operation, the system voltage is less than 9.0 volts.
Action Taken When the DTC Sets
* The EBCM disables the ABS and DRP is degraded when the code is current.
* The ABS indicator turns ON.
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. Refer to Diagnostic System Check - Vehicle . Initial Inspection and Diagnostic Overview
* 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. This step verifies that the condition is still present.
