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Message: <blockquote data-quote="51GMC" data-source="post: 20189" data-attributes="member: 11299"><p>Yes, that is exactly what that is. An electric motor driven auxiliary vacuum pump. My 03 suburban has it with a “smallish” vacuum booster. It’s supposed to assist when at high rpm’s… never paid attention to it until it started to fail lots of digging and no boost… I don’t race the ‘Burb so it is an odd addition, probably packaged with the factory tow package it’s set up with. Not cheap to replace and GM doesn’t support rebuilds any more. I’m replacing it with the larger booster that doesn’t have it, I’m doing the reaserch on how to defeat it electrically so the alarm won’t sound.</p></blockquote><p></p>