Extended life coolant may become contaminated and require cooling system service before the recommended 100,000 miles.
Resources for the Repair and Maintenance of your 2009 GMC Sierra Denali
2009 GMC Sierra Denali
2009 GMC Sierra Denali Problems
Our technicians highly recommend that the transmission is serviced every 30,000 miles to avoid problems and maintain optimal operating order.
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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.
A Loose or worn gas cap may cause Check Engine Light to illuminate.