One problem related to electrical failure has been reported for the 2008 Chevrolet Trailblazer. The most recently reported issues are listed below.
We purchased a 2008 Chevrolet Trailblazer in September 2008. The day we drove it home the entire electrical system shut down. The lights, locks, blinkers, and all gauges were not working. The vehicle was taken back to the Chevrolet dealer and the onstar module was replaced. A few months later the electrical system failed again, this has happened 3 more times since purchasing the vehicle 3 years ago. The vehicle has also had the check engine and stabilitrack lights turn on and off numerous times. . . Sometimes for a day or two, sometimes for a week. The vehicle has been in the shop more than 13 times in 3 years for electrical related problems, several electrical modules have been replaced. My grandmother has the same vehicle and has had the same type of problems with the electrical system.