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DTC B3976

DTC B3976

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 B3976 00

Unconfigured Transponder

Circuit/System Description

When the body control module (BCM) is in the learn coded key state, the BCM checks the current transmitter to ensure it has been configured as a proper vehicle transmitter.

Conditions for Running the DTC


• Ignition is in the Accessory or Run mode.

• The BCM is in the learn coded key state.


Conditions for Setting the DTC

The BCM has determined the current transmitter is not configured as a proper vehicle transmitter.

Action Taken When the DTC Sets


• Vehicle starting will be disabled.

• The security indicator in the instrument cluster will be illuminated. A service message will be displayed in the driver information center.


Conditions for Clearing the DTC


• A current DTC will be cleared when the BCM detects a properly configured vehicle transmitter.

• A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.


Reference Information

Schematic Reference

Immobilizer Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Immobilizer Description and Operation

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

Circuit/System Verification

While viewing DTCs with a scan tool, attempt to start the vehicle with each of the available vehicle transmitters by placing the transmitter in the transmitter pocket and pressing the ignition mode switch. The vehicle should start with all available transmitters.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Remote Control Door Lock and Theft Deterrent Transmitter Programming