Mending GMC vacuum pump oil leak

    April 30, 2024
    This bulletin applies to 2015-2021 GMC Canyon vehicles equipped with the LCV engine.
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    Photo courtesy of General Motors
    Inspect the inside of the vacuum hose and booster for a sticky feeling substance on the rubber. If this is present it is an indication that the vacuum pump is leaking oil.
    Inspect the inside of the vacuum hose and booster for a sticky feeling substance on the rubber. If this is present it is an indication that the vacuum pump is leaking oil.

    This bulletin applies to 2015-2021 GMC Canyon vehicles equipped with the LCV engine.

    A brake booster vacuum leak may occur noted by an audible hiss noise. DTC C0299 may be stored. This may indicate the vacuum pump leaking oil into the booster.

    Inspect the inside of the vacuum hose and booster for a sticky feeling substance on the rubber. If this is present it is an indication that the vacuum pump is leaking oil. Replace the pump and hose, along with the brake booster if 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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