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    1. TSBs

    Fixing Buick vacuum pipe

    March 5, 2024
    This bulletin applies to 2017-2020 Buick Envision vehicles.
    Related To: Mitchell 1
    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.
    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.
    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.

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