DTC Descriptor
DTC C0899: Device 1 Voltage Low
Diagnostic Fault Information
Important: Always perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
Circuit/System Description
The electronic brake control module (EBCM) monitors the ignition 3 voltage (IGN3) level available for system operation. A low voltage condition prevents the system from operating properly.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
This fault will be set if the ignition voltage to EBCM is less than 9.5 volts for 10 seconds and the vehicle speed is greater than 3 km/h (2 mph).
Action Taken When the DTC Sets
| • | The EBCM disables the Antilock Brake System (ABS)/Traction Control System (TCS)/Vehicle Stability Enhancement System (VSES) for the duration of the ignition cycle. |
| • | The ABS indicator turns ON. |
| • | The driver information center (DIC) displays the ABS FAULT message. |
| • | The Stability Caution indicator turns on. |
| • | The DIC displays the SERVICE STAB SYS message. |
| • | The DIC displays the TRACTION FAILED message. |
| • | The Brake Warning indicator turns ON if system voltage drops below 8.5 volts. |
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
Scan Tool Reference
Scan Tool Data List
for EBCM
Circuit/System Testing
- Measure and record the voltage at the battery terminals.
| ⇒ | If the battery voltage is low, diagnose the starting and charging system. |
- Disconnect the EBCM connector and turn the ignition ON. At the EBCM harness connector, measure voltage on the IGN3 circuit.
| ⇒ | If the voltage is more than one volt less than battery positive voltage, repair open or high resistance in IGN3 circuit. |
| ⇒ | If the battery positive voltage and IGN3 voltage is within 1-volt, repair open or high resistance
in the EBCM ground circuits. |
| ⇒ | If no electrical faults are present, replace the EBCM/brake pressure modulator valve (BPMV) assembly. |
Repair Instructions
Important: Always perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for EBCM and BPMV replacement, setup, and programming
