2008 GMC Sierra Denali Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2008 GMC Sierra Denali

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2008 GMC Sierra Denali Problems

Check Engine Light Due to Gas Cap Issue

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

Replace spark plugs every 100,000 miles

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

Flush brake fluid every 60,000 miles

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

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2008 GMC Sierra Denali Questions

What causes vehicle to would sputter when I press gas peddle while driving (1 answer)

Pressed acceleration peddle and vehicle sputtered as if it wanted to die. I then pulled over and shut vehicle off. Attempted to start and it would not crank unless I pressed the gas peddle.

What could this be

The glass on my spark plugs brakes, it started when it reached 52,000 miles (1 answer)

Initial symptom was a shaking during stop light idle, took it the dealer and they replace all the spark plugs and found 1 (cylinder 1) with the white ceramic portion broken.
The issue returned a few months later and they found a different cylinder (cylinder 4) spark plug with broken seal, got re...

why does my clock on the radio keep resetting when I start the truck? (2 answers)

Also there cd changer cycles through. Please let me know if there is a quick fix or do I have to take it to a repair shop.

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