Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC C0900 00: Device Voltage High - EBCM 12VDTC C0900 07: Device Voltage High - EBCM 12V
DTC C12E2 00: Device Voltage High - EBCM 12V
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
12 V B+ | C0899 00, C0899 03 | C0899 00, C0899 03 | C0900 00, C0900 07 | -- |
Ground | -- | C0899 00, C0899 03 | -- | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Ignition ON, engine OFF. Parameter Normal Value: 12.6 Volts | |||
B+ | 0.0 Volts* | 0.0 Volts* | 12.6 Volts |
*The scan tool will not communicate with the EBCM if there is 0 Volts on the circuit. | |||
Circuit/System Description
The electronic brake control module (EBCM) monitors the 12 V battery positive (B+) 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 12 V battery voltage from the solenoid valves and pump motor, and DTC C0900 sets.
Conditions for Running the DTC
Ignition is ON.
Conditions for Setting the DTC
The 12 V battery voltage is greater than 16 volts for 100 msec.
Action Taken When the DTC Sets
| • | The traction control system (TCS) and vehicle stability enhancement system (VSES) are disabled for the duration of the ignition cycle. |
| • | The antilock brake system (ABS) is disabled if ignition voltage exceeds 19.5 V. |
| • | The stability system off and traction control off indicators turn ON. |
| • | The ABS indicator turns ON if voltage exceeds 19.5 V. |
Conditions for Clearing the DTC
| • | The DTC will pass when the battery voltage is less than 15.5 V for 100 msec. |
| • | The EBCM automatically clears a history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
| • | The indicators and DIC messages turn OFF when the DTC is cleared, or on the next malfunction-free ignition cycle. |
Diagnostic Aids
| • | This DTC could be set by overcharging with a battery charger. |
| • | A high voltage DTC in multiple modules indicates a concern in the charging system. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
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 12 V battery terminals. The voltage should be between 12.6-15.0 V.
- Observe the scan tool EBCM Battery Voltage parameter. The reading should be between 12.6-15.0 Volts.
| ⇒ | If not within the specified range, refer to Charging System Test. |
| ⇒ | If greater than the specified range, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming.
