C0899

DTC C0899

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of this diagnostic approach.
* Diagnostic Procedure Instructions 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 ignition voltage level available for system operation. A low voltage condition prevents the system from operating properly. If the EBCM detects low battery voltage, DTC C0899 will set.

Conditions for Running the DTC

Ignition is ON.

Conditions for Setting the DTC

The ignition voltage available to the EBCM is less than 9 volts 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 Stability System Off and the Traction Control Off indicators turn ON.

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

A low voltage DTC in multiple modules indicates a concern in the charging system.

Circuit/System Verification

1. Ignition On. Measure and record the voltage at the battery terminals. Verify that the battery voltage is 11-17 volts. Repeat with the engine running.

^ If the battery voltage is not within the specified range, go to Charging System Test. Charging System Test

2. Engine running. Observe the scan tool Battery Voltage Signal parameter in the EBCM data list. Verify that the scan tool displays a value that is within 1 volt of the battery voltage recorded in step 1.

^ If the scan tool parameter is not within the specified range, go to Circuit/System Testing.

3. Go to Diagnostic Aids.

Circuit/System Testing

1. Ignition OFF. Disconnect the harness connector of the module that set the DTC. Verify that there is less than 1.0 ohm between the ground circuits, terminals 1 and 31, and the negative battery terminal.

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

2. Ignition ON. Test for 11-17 volts between the battery positive voltage circuits of the EBCM, terminals 16 and 46, and the ground circuits, terminals 1 and 31.

^ If not within the specified range, test the battery positive voltage circuits for a short to ground or an open/high resistance.

3. If all circuits test normal, test or replace the EBCM.

Repair Instructions

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