DTC C0900 EBCM
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. |
| • | 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
Scan Tool 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
DTC C0900 PSCM
Diagnostic Instructions
DTC Descriptor
DTC C0900: Device Voltage High
Circuit/System Description
The power steering control module (PSCM) has a discrete battery voltage supply circuit. The PSCM monitors the voltage level on this circuit to protect itself against high voltage damage.
Conditions for Running the DTC
Ignition is ON.
Conditions for Setting the DTC
The system voltage is greater than 16 volts for at least 1 second.
Action Taken When the DTC Sets
| • | The PSCM is disabled to protect itself. |
| • | No steering assist is provided. |
| • | The driver information center (DIC) displays the POWER STEERING warning message. |
Conditions for Clearing the DTC
| • | A current DTC will clear when the power steering system voltage returns to less than 16 volts. |
| • | A history DTC will clear when a current DTC is not detected in 100 consecutive drive cycles. |
Reference Information
Schematic Reference
Power Steering Schematics
Connector End View Reference
Power Steering Connector End Views
Electrical Information Reference
Scan Tool Reference
Diagnostic Aids
Jump starting the vehicle, or turning ON the ignition while charging the vehicles battery can cause DTC C0900 to set.
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 PSCM data list. Voltages should not differ by more than 1 volt.
| ⇒ | If more than 1 volt, replace the PSCM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for PSCM replacement, setup and programming
