2009 GMC Sierra Denali Problems

RepairPal has identified the most common problems with the 2009 GMC Sierra Denali as reported by actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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5
Known Problems

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

The spark plugs should be replaced every 100,000 miles. Our technicians recommend replacing the spark plug wires also at this time.

Our technicians recommend flushing the brake fluid every 60,000 miles.  Brake fluid that is dirty may cause problems in the brake system.

Extended life coolant may become contaminated and require cooling system service before the recommended 100,000 miles.
Our technicians highly recommend that the transmission is serviced every 30,000 miles to avoid problems and maintain optimal operating order.