2009 GMC Sierra Denali Repair and Maintenance

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

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2009 GMC Sierra Denali Problems

Reduced Power and Check Engine Light

The GMC Sierra 1500 Denali uses a throttle position sensor (TPS) which commonly fails and causes:

This issue is related to the throttle position sensor, and can be caused by faulty wiring to the TPS, bad connection at the TPS, or a failed TPS.

To correct this issue, the wiring harness, connector, and throttle position sensor must be inspected, tested, and/or replaced. The most common cause is a faulty TPS.

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.

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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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