2008 GMC Sierra Denali Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2008 GMC Sierra Denali

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.

Speedometer or Other Instrument Panel Gauge May Work Erratically

The speedometer or other instrument panel gauge may begin to work erratically at times. Our technicians tell us that the instrument cluster must be sent to a repair facility to correct this fault. The warranty has been extended on some of these units to 7 years or 70,000 miles.

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2008 GMC Sierra Denali Questions

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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