The recall, originally announced in December, now covers 26,751 Cadillac, Chevrolet and GMC trucks and SUVs. The models affected are: Cadillac Escalade, Escalade ESV, Cadillac EXT, Chevrolet Avalanche, Colorado, Silverado, Suburban, Tahoe; and GMC Canyon, Sierra, Yukon and Yukon XL.
GM said rear-axle cross pins, used to hold the axle in place, weren't properly heat-treated and may not be durable. They can fracture, interfere with the axle and cause it to lock. The driver could then lose control of the vehicle.
One customer has reported a loss of power to the axle, GM says. But no crashes have been reported.