Diagnostic Instructions
DTC Descriptor
DTC C0900: 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
Ignition is ON.
Conditions for Setting the DTC
The system voltage is greater than 16 volts for 100 msec.
Action Taken When the DTC Sets
| • | Traction Control System (TCS) and Vehicle Stability Enhancement System (VSES) disabled for the duration of the ignition cycle. |
| • | ABS disabled if ignition voltage exceeds 19.5 volts. |
| • | The TCS indicator turns ON. |
| • | The Antilock Brake System (ABS) indicator turns ON if voltage exceeds 19.5 volts. |
| • | The driver information center (DIC) displays the Service Stability System message. |
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. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Electrical Information Reference
Diagnostic Aids
| • | A possible cause of this DTC could be overcharging with a battery charger or jump starting. |
| • | A high voltage value in multiple modules indicates a concern in the charging system. |
Circuit/System Verification
- If the DTC is history, refer to
Charging System Test
- Start the engine, record the voltage at the battery terminals. Observe the battery voltage signal parameter in the EBCM data list. Voltages should not differ by more than 1 volt.
| ⇒ | If more than 1 volt, replace the EBCM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for EBCM replacement, setup and programming
Diagnostic Instructions
DTC Descriptor
DTC C0900: 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
Ignition is ON.
Conditions for Setting the DTC
The system voltage is greater than 16 volts for 100 msec.
Action Taken When the DTC Sets
| • | Traction Control System (TCS) and Vehicle Stability Enhancement System (VSES) disabled for the duration of the ignition cycle. |
| • | ABS disabled if ignition voltage exceeds 19.5 volts. |
| • | The TCS indicator turns ON. |
| • | The Antilock Brake System (ABS) indicator turns ON if voltage exceeds 19.5 volts. |
| • | The driver information center (DIC) displays the Service Stability System message. |
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. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Description and Operation
ABS Description and Operation
Electrical Information Reference
Diagnostic Aids
Test the charging system. Refer to
Charging System Test .
Circuit/System Testing
- Measure the voltage at the battery terminals.
- Disconnect the EBCM harness connector.
- With the ignition ON and the engine OFF, measure the voltage at the Run/Crank Ignition 1 Voltage circuit. Verify that battery terminal voltage and ignition voltage readings do not differ more than 1 volt.
| ⇒ | If more than 1 volt test the ignition voltage and ground circuits of the EBCM for high resistance, an open, or replace the EBCM. |
- Go to
Charging System Test .
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup and programming.
