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 Instructions) provides 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. If the voltage level is too high, damage may result in the system. When a high voltage condition is detected, DTC C0900 00 sets.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The EBCM detects that the battery voltage is greater than 18 volts.

Action Taken When the DTC Sets

* The antilock brake system (ABS), electronic brake force distribution (EBD), traction control system (TCS), and vehicle stability enhancement system (VSES) are disabled.
* The ABS, BRAKE, and vehicle dynamics caution (VDC) indicators turn ON.
* The driver information center (DIC) displays the SERVICE ESC, SERVICE TRACTION, and SVC BRAKE SYSTEM messages.
* The DIC displays the ESC OFF message 1 time.
* The ABS pump motor turns ON if the voltage is greater than 28 volts.

Conditions for Clearing the DTC

* The indicators and DIC messages will turn OFF when the condition for setting the DTC is no longer present.
* The DTC will pass when the condition for setting the DTC is no longer present, and the ignition is cycled.
* The EBCM clears a history DTC when the DTC does not fail 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 (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

* ABS Description and Operation (Description and Operation)
* Charging System Description and Operation (w/RVC) (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 (Programming and Relearning)for scan tool information

Circuit/System Verification

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

• If not within the specified range, refer to Charging System Test (Charging System Test).

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

• 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 (Programming and Relearning)for EBCM replacement, setup and programming.