DTC C0900
Diagnostic Instructions
DTC Descriptor
DTC C0900 00: Device Voltage High
Circuit/System Description
The electronic brake control module (EBCM) monitors the ignition voltage. If the voltage level is too high, damage may result in the system. When a high voltage condition is detected the EBCM turns OFF the system relay which removes battery voltage from the solenoid valves and pump motor.
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 V for 0.72 seconds.
Action Taken When the DTC Sets
• | The EBCM disables the ABS for the duration of the ignition cycle. |
• | The antilock brake system (ABS) indicator turns ON. |
• | The traction control and active handling indicator turns ON. |
• | The solenoid relay opens, removing voltage from the solenoids and pump motor. |
Conditions for Clearing the DTC
• | The condition for the DTC is no longer present. |
• | 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 Battery Inspection/Test and Charging System Test .
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6-15.0 V.
- Observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be between 12.6-15.0 V.
⇒ | If greater than the specified range, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure
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