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GM recalls 814K vehicles to fix ABS software, alternator wiring

The software glitch can disable the electronic stability control and antilock brake system without illuminating a warning light.

General Motors has issued two large recalls encompassing around 814,000 newer vehicles.

The 2019 Chevrolet Silverado 1500, GMC Sierra 1500 and Cadillac CT6 are vulnerable to a software error that can disable the vehicle's electronic stability control and antilock brake system, without illuminating the instrument cluster malfunction lamps. The issue was discovered by the brake control module supplier and will be remedied via a software update.

The 2019-2020 Silverado and Sierra 1500 may also have been assembled with excessive glue on a power cable connection, causing an intermittent connection between the battery positive connection and alternator.

"An intermittent electrical connection between the B+ battery cable and the alternator could cause the vehicle to stall, increasing the risk of a crash," the recall documents warn. "The intermittent connection could also lead to electrical arcing, which could generate sufficient heat to damage surrounding material, increasing the risk of a fire."

Service technicians will use a black light to inspect the cable attachments for glue contamination, cleaning and reattaching as necessary and replacing any components that have already been damaged by arcing.

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