GM Service Manual Online
For 1990-2009 cars only

Conditions for Setting the DTC

The signal received by the BCM from a remote control door lock transmitter was not assigned to the BCM.

Action Taken When the DTC Sets

All of the remote control door lock transmitter functions do not operate.

Conditions for Clearing the DTC

DTC 42 is set when all of the following conditions occur:

    • The BCM is in the diagnostic mode.
    • Any button on the remote control door lock transmitter is pressed.
    • The BCM does not recognize the transmitter being used.

DTC 42 is automatically cleared after it is displayed. Any button on the remote control door lock transmitter must be pressed again to display DTC 42.

Diagnostic Aids

DTC 42 may be set due to the following conditions:

    • The transmitter was defective.
    • A transmitter was used without programming it to the BCM.
    • Another transmitter was used in the immediate area.

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Remote Keyless Entry

2

  1. Enter the BCM Diagnostic mode. Refer to On-Board Diagnostic Features in Body Control System.
  2. Press any button on the keyless entry transmitter.

Is code 44 present?

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Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

Attempt to operate all of the remote functions using the transmitter.

Do all of the transmitter functions operate properly?

--

Go to Step 4

Go to Keyless Entry System Inoperative

4

Important: Perform the programming procedure when replacing the body control module (BCM).

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

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System OK

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