Buick Regal 2018-2026 Owners Manual / OnStar
Buick Regal: OnStar
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OnStar Overview
Voice Command Button
Blue OnStar Button
Red Emergency Button
This vehicle may be equipped with a
comprehensive, in-vehicle system
that can connect to an OnStar
Advisor for Emergency, S
Emergency
Emergency Services require an
active, OnStar service plan
(excludes Basic Plan). With
Automatic Crash Response, built-in
sensors can automatically alert a
specially trained OnStar Advisor
who is immed
SEE MORE:
Brake Master Cylinder Replacement
Removal Procedure
WARNING: Brake Fluid Irritant Warning.
CAUTION: Brake Fluid Effects on Paint and Electrical Components Caution.
1. Place the ignition switch in the OFF position.
2. Apply and release the brake pedal several times until the brake pedal
becomes firm to deplete the
power vacuum brak
DTC P0231, P0232, or P023F
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.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
D
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