Buick Regal: Diagnostic Information and Procedures

 DTC B1446 or B1447 (IOR/IOS/IOT)

Diagnostic Instructions Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Review Strategy Based Diagnosis for an overview of the diagnostic approach. Refer to Diagnostic Procedure Instructions for an overview of each diagnostic category. DTC Descripto

 Parking Brake Actuator Replacement (GNQ)

Removal Procedure WARNING: Brake Dust Warning 1. Set the park brake in Service Mode. Manual Method Change the transmission gear to neutral or park position. Press and hold the push button start switch for 10 seconds, with the brake pedal not applied. This will place the vehicle in Service Mode