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 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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