C0900

DTC C0900

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.

DTC Descriptor
DTC C0900 00
- Device Voltage High - EBCM

Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

The electronic brake control module (EBCM) monitors the battery positive (B+) voltage level available for system operation. A high or low voltage condition prevents the system from operating properly, and may cause damage to the system.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The battery voltage is greater than 16 V 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 voltage exceeds 19.5 V.
* The EBCM requests the MIL to be turned ON.
* The BRAKE indicator turns ON.
* The antilock brake system (ABS) indicator turns ON if voltage exceeds 19.5 V.

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.

Diagnostic Aids

* This DTC could be set by overcharging with a battery charger or jump starting.
* A high voltage DTC in multiple modules indicates a concern in the charging system.

Reference Information
Schematic Reference

Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

ABS Description and Operation Description and Operation
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module Referencesfor scan tool information

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the voltage at the battery voltage at the battery terminals. The voltage should be between 12.6-15.0 V.

• If not within the specified range, refer to Charging System Test Testing and Inspection.

2. Observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be between 12.6 and 15.0 V.

• If greater than the specified range, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Control Module Referencesfor EBCM replacement, setup, and programming.