GM dealers were informed on April 26th that the stop-sale order on certain Silverado HD and Sierra HD trucks, which had been active since March 17th, had been lifted. GM Authority was first to report on this stop-sale order, which was issued due to a potential hydrolock/no-start issue in roughly 3,500 Duramax-powered 2022 Chevy Silverado HD, GMC Sierra HD, and Chevy Silverado MD (4500HD / 5500HD / 6500HD) units.
With this change, GM dealers are once again permitted to sell affected trucks to customers. Dealers will also now be able to deliver customer trucks that were on order before the stop-sale but had gotten wrapped up in this quality control protocol.
GM Authority reported previously that GM had agreed to repurchase certain units of the Chevy Silverado HD and GMC Sierra HD due to apparent quality issues with the 6.6L L5P V8 turbodiesel Duramax engine. Although GM has agreed to replace affected trucks, replacement vehicles are subject to feature constraints as a result of the ongoing global microchip shortage, which limits the availability of features like heated and ventilated front seats, heated outboard rear seats, heated steering wheels, and Front And Rear Park Assist. While GM has not confirmed as much, it seems likely this issue is related to the one that caused the stop-sale order.
The 6.6L V8 L5P turbodiesel Duramax is rated at 445 horsepower and 910 pound-feet of torque, enabling a maximum towing capacity of 36,000 pounds in properly configured Chevy Silverado HD and GMC Sierra HD models. The diesel eight-cylinder is produced at the DMax Ltd. engine plant in Moraine, Ohio as part of a joint venture between GM and Isuzu Diesel Services of America, Inc. The latest L5P iteration of this engine went into production at this facility in 2016 for the 2017 model year.