The NHTSA's investigation covers 865,000 Chevrolet Trailblazers, GMC Envoys, Buick Rainiers and Saab 9-7Xs produced between 2005 and 2007. The NHTSA has received several complaints alleging the SUVs' fuel gauges indicate inaccurate and random fuel levels while driving, with some instances resulting "in the vehicle running out of fuel and causing vehicle stall with no restart."
In total the NHTSA has received 668 complaints on the issue, with 58 of those complaints resulting in the vehicle stalling. Of those 58 complaints, 43 reported stalling as a result of an inaccurate fuel gauge reading.
At least one accident is being blamed on the fuel gauge defect. A vehicle was struck from behind on a freeway off ramp after running out of gas.
GM says it is fully cooperating with the investigation.