GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2004 🢒 Malibu 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 DTC B3976

Circuit Description

When the theft deterrent module (TDM) is in the learn coded key mode or learn more keys mode and the crypt valet mode is enabled the TDM checks the passkey III+ (PK3+) key to insure it has been configured as a master key or a valet key.

DTC Descriptor

DTC B3976 Unconfigured Transponder.

DTC Symptom Type

DTC Symptom Descriptor

48

Theft/Security data not programmed.

Conditions for Running the DTC
    •  The ignition switch is in the ACCESSORY or RUN position.
    • The TDM is in the learn coded key mode or learn more keys mode.
    • The crypt valet mode is enabled in the TDM.

Conditions for Setting the DTC

The TDM has determined that the PK3+ key has not been configured as a master key or a valet key.

Action Taken When the DTC Sets
    • The vehicle will not start.
    • The TDM sends a message via the serial data circuit to the body control module (BCM) to illuminate the SECURITY indicator.

Conditions for Clearing the MIL/DTC
    • The TDM clears the current DTC when the condition for setting is not present and the ignition is cycled from OFF to ON.
    • The TDM clears the history status of the DTC after 100 fault free ignition cycles.
    • The DTC can be cleared by using a scan tool.

Test Description

The numbers below refer to the step numbers on the diagnostic table:

  1. Verifies the conditions for setting DTC B3055 or B3060 are not current.

    2.

  2. The key must have the proper mechanical cut and the TDM must "learn" the transponder value.

Step

Action

Yes

No

Schematic Reference: Theft Deterrent System Schematics

Connector End View Reference: Theft Deterrent System Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic Starting Point - Vehicle in Vehicle DTC Information

2

Is DTC B3055 or B3060 set as a current code?

Go to DTC B3055 or DTC B3060

Go to Step 3

3

Important: Two learned master keys are required to perform the Adding Keys procedure on export vehicles with option code (UA2). If only one learned master key is available then the Replacing Keys procedure will need to be performed. Refer to Replacing Keys .

  1. Replace the suspect key.
  2. Copy the mechanical cut of the available key on a PK3+ replacement key.
  3. Perform the Adding Keys procedure if the required number of learned master keys are available. Refer to Adding Keys Adding Keys . If the required number of learned master keys are not available. Refer to Replacing Keys Replacing Keys .

Did you complete the replacement?

Go to Step 4

--

4

  1. Use a scan tool in order to clear the DTCs
  2. Attempt to start the vehicle.

Does the DTC reset?

Go to Step 2

System OK