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 V.
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) warning indicators turn ON.
* The driver information center (DIC) displays the SERVICE ESC and SERVICE TRACTION messages.
* The ABS pump motor turns ON if the voltage is greater than 28 V.
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 ignition 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.
Diesel Engine with RPOs (JL4, K76 and LMM) ONLY
A condition may result in a stored history DTC C0900 with a Service StabiliTrak and Trac Off Message. This DTC can set if the engine is immediately free revved at half throttle or more, after a cold start, or after immediate cold engine drive off not allowing the engine to warm up after the Wait to Start lamp goes off. The DTC may be stored in history due to a sudden spike in the charging system that exceed 16 V causing the EBCM to store the DTC and display the messages, and no repairs are necessary. Please refer the customer to the operating and starting of a diesel engine in the Owner's Manual under Features and Controls "Starting the Diesel Engine" for DURAMAX (R) Diesel Engine.
Reference Information
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
* Antilock Brake System Schematics (Electrical Diagrams) ABS Description and Operation less than 8600 GVW
* Antilock Brake System Schematics (Electrical Diagrams) ABS Description and Operation greater than 8600 GVW
* Charging System 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 (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 V.
• If not within the specified range, refer to Charging System Test (Component Tests and General Diagnostics).
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 (Programming and Relearning) for EBCM replacement, programming and setup