GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2006 🢒 LaCrosse 🢒 DTC 🢒 DTC C0896

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

DTC Descriptor

DTC C0896: Device Voltage Range/Performance

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Battery Positive Voltage

C0896

C0896

--

Ground

 

C0896

  

Circuit/System Description

The electronic brake control module (EBCM) is required to operate within a specified range of voltage to function properly. During ABS and traction control system (TCS) operation, there are current requirements that will cause the voltage to drop. Because of this, voltage is monitored out of ABS/TCS control to indicate a good charging system condition, and also during ABS/TCS control when voltage may drop significantly. The engine control module (ECM) also monitors for high voltage conditions which could damage the EBCM.

Conditions for Running the DTC
    • The ignition is ON.
    • The vehicle speed is greater than 5 km/h (3 mph).

Conditions for Setting the DTC
    • The EBCM operating voltage at terminal 8 falls below 9.4 volts out of ABS/TCS control, or 8.8 volts during ABS/TCS control.
    • The EBCM operating voltage at terminal 8 rises above 17.4 volts.
    • The low voltage or the high voltage is detected for more than 500 milliseconds with the vehicle speed above 6 km/h (3.6 mph).

Action Taken When the DTC Sets
    • The EBCM disables the ABS/TCS, and the vehicle stability enhancement system (VSES) and for the duration of the ignition cycle.
    • A DTC will set.
    • The ABS indicator turns ON.
    • The Stability Off indicator turns 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.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Antilock Brake System Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Diagnostic Aids

    • A high or low voltage DTC set in multiple modules indicates a concern in the charging system.
    •  A possible cause of this DTC could be overcharging with a battery charger or jump starting.
    • A high or low voltage value in multiple modules indicates a concern in the charging system.

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 15.5 volts.
    2. ⇒If not within the specified range, refer to Charging System Test
  2. Observe the scan tool EBCM Ignition Voltage parameter. The reading should be between 12.6 and 15.5 volts.

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Test for less than 5.0 ohms between the ground circuits and ground.
    3. •  X1 terminal 12
    •  X1 terminal 15
    ⇒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 ignition voltage circuit X1 terminal 8 and ground.
    4. ⇒If the test lamp did not illuminate , test the ignition voltage circuit for a short to ground or an open/high resistance.
  4. If the circuits tests normal, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup and programming.