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Test Description

WARNING: This page is about a different variant/trim than selected.

The numbers below refer to the step numbers on the diagnostics, table.

2. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.

3. If no DTCs are present, refer to the symptom list of further diagnostics.

4. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

Fig 1: Diagnostic System Check - Automatic Transmission Shift Lock Control
G01558251Courtesy of GENERAL MOTORS CORP.