C0899

DTC C0899

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptor
DTC C0899
- Device Voltage Low




Diagnostic Fault Information






Circuit/System Description

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


Conditions for Running the DTC

Ignition is ON.


Conditions for Setting the DTC

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


Action Taken When the DTC Sets

* Antilock Brake System (ABS) and Traction Control System (TCS) are disabled for the duration of the ignition cycle.
* The ABS and TCS indicators illuminates on the IPC.
* The DIC displays the Service Stability System message, if equipped.



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.



Reference Information
Schematic Reference

Antilock Brake System Schematics (Except JL7) (Antilock Brake System Schematics (Except RPO JL7))Antilock Brake System Schematics (JL7) (Antilock Brake System Schematics (With RPO JL7))
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (Without JL7) (ABS Description and Operation (Without RPO JL7))ABS Description and Operation (With JL7) (ABS Description and Operation (With RPO JL7))
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information


Circuit/System Verification

1. Verify DTC C0899 is set as current.
2. Engine running, measure and record the voltage at the battery terminals.
3. Verify that the battery voltage is 12.6-15.5 volts.

• If the battery voltage is not within the specified range, refer to Charging System Test (Charging System Test)

4. Engine running, observe the scan tool EBCM battery positive voltage parameter.
5. Verify that battery terminal voltage and Battery Positive Voltage parameter readings do not differ by more than 2 volts.



Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition OFF, test for less than 3.0 ohms between the ground circuits terminals E and F to ground.

• If greater than the specified range, test the ground circuits for an open/high resistance.

3. Ignition ON, verify a test lamp illuminates between the Battery Positive Voltage circuits terminals A , B and C.

• If the test lamp did not illuminate, test the affected Battery Positive Voltage 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 (Verification Tests) after completing the diagnostic procedure.


Control Module References (Programming and Relearning) for EBCM replacement, setup and programming