In affected vehicles, the axles might include cross pins that weren't adequately heat-treated. If the pin fractures, the driver might hear a banging noise from the axle, GM says, though a broken pin could also happen without warning, causing the wheel to lock up completely and leading to a sudden loss of control and a crash.
The recall now covers an additional 26,751 trucks, all from the 2011 model year—now bringing the total to 28,013—including the Cadillac Escalade, Escalade ESV 1500, and EXT 1500; the Chevrolet Avalanche, Colorado, Silverado 1500, Suburban 1500, and Tahoe; and the GMC Canyon, Sierra 1500, Yukon, and Yukon XL 1500.
Although only some cross pins are defective, dealerships will be replacing all of them in affected vehicles.
The recall effort is expected to begin within the next week, and owners with any questions are instructed to contact Cadillac at 866-982-2339, Chevrolet at 800-630-2438, or GMC at 866-996-9463, or the NHTSA Vehicle Safety Hotline at 888-327-4236.