GM Service Manual Online
For 1990-2009 cars only

Conditions for Running the DTC

    • The system voltage is between 9-18 volts.
    • Road test the vehicle. Refer to Road Test .

Conditions for Setting the DTC

Malfunction of the lockup clutch.

Action Taken When the DTC Sets

The transmission control module (TCM) illuminates the A/T warning lamp when the diagnostic runs and fails.

Conditions for Clearing the A/T Warning Lamp or DTC

The TCM turns OFF the A/T warning lamp when the diagnostic runs and does not fail.

DTC 41

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Automatic Transmission

2

Are any other DTCs set?

Go to Diagnostic Trouble Code (DTC) List - Vehicle

Go to Step 3

3

Disassemble transmission and repair an internal transmission fault with the lockup clutch or the control valve.

Did you complete the repair?

Go to Step 4

Go to Step 4

4

  1. Clear the DTCs. Refer to Clearing Transmission Diagnostic Trouble Codes .
  2. Start the engine.
  3. Operate the vehicle within Conditions for Running the DTC.

Does the DTC reset?

Go to Step 2

System OK