General Motors has issued a new recall that affects hundreds of thousands of Chevy and GMC pickup trucks and SUVs. The recall, filed with the National Highway Traffic Safety Administration this week, declares a software error could result in unintended braking.
Included in the recall are some of the automaker's most popular trucks and SUVs. The 2014-2018, 2015-2020 and , 2014-2018 and 2015-2020 all may house faulty electronic brake control module software.
In total, the problem affects 638,000 vehicles. GM added the issue is present only in SUVs and trucks with a 5.3-liter V8 engine, 3.08-ratio rear axle and four-wheel drive. In these vehicles, a wheel-speed sensor failure may not play nice with the wonky software, and the driveline-protection system could activate.
If it does activate, drivers will experience unexpected braking from the wheel opposite of the wheel that houses the failed speed sensor. This might occur when a driver selects four-wheel drive or travels between 41 mph and 60 mph, according to the automaker. GM added the brake control modules in affected Chevy and GMC vehicles have incorrect axle-ratio calibrations, which leads to the inability to properly calculate wheel speed, and thus, unlock issues with the driveline-protection system. If the unintended braking occurs, the vehicle may pull to one side unexpectedly, which increases the risk of a crash.
If a wheel-speed sensor fails, drivers will see the electronic stability control and antilock brake lights (ESC and ABS) illuminate on the dashboard. A message reading "Service StabiliTrak" will also appear. If this occurs, GM said owners can eliminate the risk by not placing their truck or SUV in four-wheel drive mode before the recall repair.
GM will notify owners of the affected Chevy and GMC models via mail, though the automaker hasn't produced a schedule yet. The fix will see a technician reprogram the EBCM for free.