Manufacturing defects with internal components (connecting rod and/or crankshaft) can cause engine damage and failure. According to National Highway Traffic Safety Administration documents, drivers may see warning signs of a developing problem, such as unusual engine sounds, a check engine light in the instrument panel, and engine performance issues, such as hesitation, revving, abnormal shifting, and reduced power. If the engine fails when the vehicle is being driven, there is a risk of a crash.
Dealerships will inspect the engine and, as necessary, repair or replace it.
They will add higher-viscosity oil to the SUVs that pass inspection, install a new oil fill cap, replace the oil filter, and update the owner’s manual.
Changes to the connecting rods and crankshaft were made and introduced into production by June 1, 2024.
GM’s investigation into problems involved more than 28,000 complaints about the L87 engine. The company identified 12 potentially related crashes and a dozen potentially related injuries.
Owners will be notified by mail in June 2025.
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