Chassis-code "[GMT921]" for all "2007-2013 Chevrolet Tahoe", "Chevrolet Tahoe Hybrid" and "2007-2014 Chevrolet Tahoe PPV".
And for these vehicles.
http://www.imcdb.org/vehicle_908548-Chevrolet-Tahoe-PPV.html
http://www.imcdb.org/vehicle_1030550-Chevrolet-Tahoe.html