GM Service Manual Online
For 1990-2009 cars only

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 03: Device Voltage Range Voltage Below Threshold

DTC C0896 07: Device Voltage Range Voltage Above Threshold

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Voltage Below Threshold

Voltage Above Threshold

Device Voltage Range

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DTC C0896 03

DTC C0896 07

Circuit/System Description

This DTC is set up to detect a high or low voltage situation. This could indicate a vehicle issue in which all electrical components would be affected. It could also be transfer case control module specific do to poor power or ground connections.

Conditions for Running the DTC

    • The ignition is ON.
    • System voltage is 10.5-18.5 volts.

Conditions for Setting the DTC

The voltage is above 18.5 volts or below 10.5 volts for 15 seconds.

Action Taken When the DTC Sets

    • Shifting is disabled until the voltages change to be within the specifications.
    • The SERVICE 4WD will illuminate for the remainder for the ignition cycle.

Conditions for Clearing the DTC

    • The transfer case shift control module clears the DTC if the condition for setting the DTC is not currently present.
    • A history DTC clears after 40 consecutive warm up cycles without a fault present.
    • History DTCs can be cleared using a scan tool.

Reference Information

Schematic Reference

Transfer Case Control Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

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

Scan Tool Reference

Control Module References for scan tool information.

Diagnostic Aids

Perform the motor learn procedure before normal operation will occur.

Circuit/System Testing

  1. If the voltage is low check the voltage on other vehicle systems to determine if this is a vehicle wide condition and take appropriate actions. If this is transfer case specific check the ignition 3 feed to the transfer case control module and the ground for the transfer case control module for proper connections.
  2. If the voltage is high, this is likely a vehicle issue such as an alternator problem or the vehicle has been hooked up improperly during a jump start.
  3. After the condition is corrected perform the motor learn procedure.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Transfer Case High/Low Clutch Reset