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

Check Engine Light Due to Gas Cap Issue

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

Check Engine Light and Trouble Filling Gas Tank

The GMC Sierra Denali is known to have issues with the EVAP system, a part of your emission control system.

The EVAP canister vent valve or valve solenoid wiring may fail causing illumination of the check engine light, setting code P0446, and problems filling the tank with fuel.

To correct the issue, the EVAP canister vent valve, solenoid, and wiring must be inspected. The most common fix is replacement of the wiring connector or replacement of the vent valve assembly.

Service transmission every 30,000 miles
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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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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