The General Motors family of large four cylinder engines, being the 2.0L turbo and 2.5L models in just about everything from the Chevrolet Malibu to the Cadillac CTS, are reportedly hindered by faulty connecting rods, though General Motors can’t do much in the case of issuing a recall.
Car & Driver has reported that three cases involving GM vehicles featuring a variant of these engines they were testing themselves experienced connecting rod failure. Multiple consumer cases have also been cited. Though GM isn’t issuing a recall, the engines are replaced in accordance with GM’s five-year, 100,000 mile Powertrain warranty.
The main reason GM isn’t issuing a recall is that there really isn’t any way to track which bearings are installed in each engine. An affected motor with bad rods should emit a highly noticeable metal-on-metal knocking noise within the vehicle’s first few thousand miles of life, and seems to occur every “one or two per 1,000 cars.”