C0899

DTC C0899
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. Diagnostic System Check - Vehicle

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.

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
ABS Schematics

Connector End View Reference
ABS Connector End Views

Electrical Information Reference
^ Charging System Test
^ Circuit Testing
^ Connector Repairs
^ Testing for Intermittent Conditions and Poor Connections
^ Wiring Repairs

Scan Tool Reference
Scan Tool Data List for EBCM

Circuit/System Testing
1. Measure and record the voltage at the battery terminals.
^ If the battery voltage is low, diagnose the starting and charging system.

2. 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. Verification Tests

Control Module References for EBCM and BPMV replacement, setup, and programming