General Motors is removing more than 90,000 vehicles on a transmission control valve problem that can make the tires block, the National Highway Traffic Safety Administration said.
The problem affects cars with a 10 -speed transmission, said the security administration. Over time, the transmission control valve in some of the vehicles can become susceptible to excessive wear, causing a loss of pressure inside the valve that can cause a hard change, he said.
“In rare cases, the wheels can experience a momentary block,” said the administration in a retirement notice, increasing the risk of an accident.
The affected models are Cadillac CT4 2020-2021, 2020-2021 CADILLAC CT5, 2019-2020 CADILLAC CT6 and CHEVROLET CAMARO 2020-2022.
Of the 90,081 potentially affected cars, it is estimated that 1% has the defect, said the NHTSA.
In September, the driver of a CT5 2021 Cadillac reported that the front tires of his car locked, said the agency.
GM had previously investigated the issue, he said. Because the blockages generally lasted less than 150 milliseconds, the company determined that after not reported accidents or related injuries, it was not enough time for the vehicle to lose control and close the investigation, according to the security administration.
Research on the problem was reopened in November 2024, with a GM researcher who found 115 block reports, and one led to an accident, said the NHTSA.
The GM Security Field Action Authority subsequently decided to carry out a security withdrawal on February 27, the Security Administration said.
The affected owners will be notified from next month and can obtain a new transmission control software that detects the wear of the excessive safety valve and will prevent wheel locks.
