2003 GMC Sonoma Owner's Manual - Page 327

Tires Your new vehicle comes with high-quality tires made by a leading tire manufacturer. If you ever have questions about your tire warranty and where to obtain service, see your GMC Warranty booklet for details. Poorly maintained and improperly used tires are dangerous. 0 Overloading your tires can cause overheating as a result of too much friction. You could have an air-out and a serious accident. See "Loading Your Vehicle" in the Index. Underinflated tires pose the same danger as overloaded tires. The resulting accident could cause serious injury.Check all tires frequently to maintain the recommended pressure. Tire pressure shouldbe checked when your tires are cold. Overinflated tires are more likely to be cut, punctured or broken by a sudden impact - such as when you hit a pothole. Keep tires at the recommended pressure. Worn, old tires can cause accidents. If your tread is badly worn, or if your tires have been damaged, replace them. 5-64