C0900

DTC C0899 or C0900

Diagnostic Instructions
^ Perform the [Diagnostic System Check - Vehicle Diagnostic Information] prior to using this diagnostic procedure. Diagnostic System Check - Vehicle Diagnostic Information
^ Review [Strategy Based Diagnosis] for an overview of the diagnostic approach. Strategy Based Diagnosis
^ [Diagnostic Procedure Instructions - Vehicle Diagnostic Information] provides an overview of each diagnostic category. Diagnostic Procedure Instructions - Vehicle Diagnostic Information

DTC Descriptor
DTC C0899 Device Voltage Low
DTC C0900 Device Voltage High

Diagnostic Fault Information






Circuit/System Description

C0899
The electronic brake control module (EBCM) monitors the ignition voltage level available for system operation. A low voltage condition prevents the system from operating properly.

C0900
The electronic brake control module (EBCM) monitors the ignition voltage. If the voltage level is too high, damage may result in the system. When a high voltage condition is detected the EBCM turns OFF the system relay which removes battery voltage from the solenoid valves and pump motor.

Conditions for Running the DTC
Ignition is ON.

Conditions for Setting the DTC

C0899
This fault will be set if the ignition voltage to EBCM is less than 9 volts for 100 msec.

C0900
The system voltage is greater than 16 volts for 100 msec.

Action Taken When the DTC Sets

C0899, C0900
^ Traction Control System (TCS) and Vehicle Stability Enhancement System (VSES) disabled for the duration of the ignition cycle.
^ The TCS indicator turns ON.
^ The driver information center (DIC) displays the Service Stability System message.

C0900
^ ABS disabled if ignition voltage exceeds 19.5 volts.
^ The Antilock Brake System (ABS) indicator turns ON if voltage exceeds 19.5 volts.

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.

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 Positive Voltage parameter. The reading should be between 12.6 and 15.0 volts.

Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Test for less than 1.0 ohm of resistance between the ground circuit terminal 16 and ground.
^ If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminals listed below and ground.
^ Terminal 1
^ Terminal 32

^ If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. If the circuit tests normal, replace the EBCM.

Repair Instructions
Perform the [Diagnostic Repair Verification - Vehicle Diagnostic Information] after completing the diagnostic procedure. Diagnostic Repair Verification - Vehicle Diagnostic Information