2009 GMC Sierra Denali Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2009 GMC Sierra Denali

2009 GMC Sierra Denali Problems

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.

Contamination of extended life coolant
Extended life coolant may become contaminated and require cooling system service before the recommended 100,000 miles.

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2009 GMC Sierra Denali Questions

Sometimes my radio controls on the steering operate backwards, why is this? (1 answer)

When I adjust radio volume down, it goes up. When I change stations up it changes station down the dail.
This problems occurs about 50% of the time when I'm driving.
I usually just use the manual controls on the radio, they work fine.

I have a P0172 or P0175 with check engine light (1 answer)

When I start it in the morning it holds for awhile then it start with some black smoke from the back and when the check engine light is on the car can't be start from remote control

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