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GM recalls 638K trucks, SUVs over unintended braking

The vehicles may suddenly brake one rear wheel if the speed sensor fails.

General Motors has issued a large recall for certain newer pickups and SUVs that are prone to unintended braking.

The issue involves the 2015-2020 Chevrolet Suburban, Tahoe and Yukon; and the 2014-2018 Chevy Silverado 1500 and GMC Sierra, but only if the vehicles are equipped with a 5.3-liter engine, 3.08-ratio rear axle and four-wheel drive.
If one of the rear wheel-speed sensors fails and the vehicle is traveling at 41-60 mph, the driveline-protection system will activate and engage the brake on the wheel opposite of the failed sensor. Single-wheel braking will cause the vehicle to pull to one side, potentially causing an accident.
GM traced the defect to incorrect axle-ratio calculations used by the control module. The campaign affects around 638,000 vehicles, all of which will receive revised software to prevent malfunction.

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