Buick Regal: Diagnostic Information and Procedures

 Symptoms - Cruise Control

NOTE: The following steps must be completed before using the symptom tables. 1. Before using the symptom diagnostic table, perform the Diagnostic System Check - Vehicle in order to verify the following conditions: There are no DTCs set. The module can communicate via the serial data. 2. Review

 DTC C056D

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis An overview of each diagnostic category can be found here:Diagnostic Procedure