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.

ABS Light Due to Poor Electrical Ground Under the Battery Tray

A poor electrical ground under the battery tray may cause the ABS warning light to illuminate. Our technicians tell us that cleaning and properly securing this ground and also the main ABS ground on the frame rail below the drivers door may be necessary.

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.

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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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