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Write to us if something in a guide doesn't match the GM service bulletin it cites. Please include the page URL and the bulletin number and page you are comparing it with. We check the bulletin, and we make the correction when the bulletin supports it.

You can also write about a broken link, or with a question about one of the guides.

We can't diagnose a specific car by email. We can't see or test the vehicle, and our guides only explain what a bulletin says. For a problem with your own car, a qualified technician working from current VIN-specific service information is the right next step.