Fixing Buick vacuum pipe

    March 5, 2024
    This bulletin applies to 2017-2020 Buick Envision vehicles.
    Related To:
    Photo courtesy of Buick
    Replace the power brake booster vacuum pipe with the later version P/N 84974396. Check and clear any DTCs as needed.
    Replace the power brake booster vacuum pipe with the later version P/N 84974396. Check and clear any DTCs as needed.

    This bulletin applies to 2017-2020 Buick Envision vehicles. The SES (Service Engine Soon) lamp may be illuminated and/or the Service Brake Assist message may be displayed on the DIC (driver information center).

    The cause may be inconsistent in-rush current provided by the 5V reference during the Start/Stop crank event. 

    Replace the power brake booster vacuum pipe with the later version P/N 84974396. Check and clear any DTCs as needed.

    About the Author

    Motor Age Staff

    Motor Age has been publishing technical content for professional automotive technicians since 1899. Our writers have decades of experience and scores of ASE certifications, and they continue to teach new generations of technicians via classrooms all around the globe, as well as through the books and training manuals they've authored. 

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