2008 GMC Sierra Denali Electrical system Problems
- Complaints
- 2about this part
- Share
- 11%of 18 total for the year
- Median mileage
- 109,515miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 2 complaints about the electrical system of the 2008 GMC Sierra Denali, 11% of the 18 complaints for this model year. Where a mileage was given, the median is 109,515 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I was driving on the highway when all the lights on the instrument cluster came on and went crazy and so did the radio. The trucks brakes locked up and came to a complete stop. The truck turned off and when I tried to turn it back on it was dead. Open up the hood and disconnected the battery and reconnected and the truck turned on this has not been the only time it has happen.”
NHTSA complaint #10667174, filed 2014-12, 91,030 miles“My truck started to activate the brakes in the middle of the 3 lane 680 freeway, doors started to lock and unlock, navigation went dark, multiple different displays on dashboard, number of lights from the air conditioner unit, came on. Acceleration or brakes would not respond, we were unable to drive off the freeway. It was a scary moment, we were lucky that no big rig was following us, or it would had runs us over, and probably killed us.”
NHTSA complaint #10640690, filed 2014-10, 128,000 milesRelated service bulletins
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Electrical system: other model years
Other parts of the 2008 GMC Sierra Denali
6 complaintsAir bags
3 complaintsOther or unknown
3 complaintsBrakes
1 complaintsElectronic stability control
1 complaintsExterior lighting
1 complaintsFuel system
1 complaintsLatches, locks and linkages
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaintsWheels
1 complaints
← All problems reported for the 2008 GMC Sierra Denali
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology