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. 

    Email

    Continue Reading

    Sponsored Recommendations

    Learn how electronic parking brake actuators have replaced manual systems and now play a key role in advanced safety features like automatic emergency braking. This WIYB Training...
    Not all fuel injectors are created equal. In this WIYB Training Series, we compare Standard® Fuel Injectors against OE, low-cost imports. See why precision engineering and rigorous...
    Carrying active OEM subscriptions for all manufacturers is not possible for many shops. However, access to this software is required for certain modern vehicles and repairs, and...
    Learn how to properly lubricate your AIRCAT air tools to keep them running at peak performance. Discover essential daily maintenance and storage techniques, along with the right...

    Voice Your Opinion!

    To join the conversation, and become an exclusive member of Vehicle Service Pros, create an account today!