Antilock Brakes / Traction Control Systems
DTC C0900
Circuit Description
The electronic brake control module (EBCM) monitors the voltage level available for system operation. If the voltage level is too high, damage may result to the system. When the EBCM detects a high voltage condition, the EBCM disables the ABS system.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0900 Device Voltage High
Conditions for Running the DTC
The vehicle speed is greater than 8 km/h (5 mph).
Conditions for Setting the DTC
The system voltage is greater than 17 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 electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
A possible cause of this DTC is overcharging.
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.
3. Use the scan tool in order to inspect the voltage to the body control module (BCM). A high voltage value in multiple modules indicates a concern in the charging system.
4. Verifies that the condition is still present.
