A faulty Engine Coolant Temperature (ECT) sensor may lead the turbocharged 2.0L I4 LSY gasoline engine in certain GM vehicles to run hot or even overheat.
GM says some 2019-2022 model year Buick, Cadillac, Chevrolet and GMC vehicles equipped with the 2.0L I4 LSY engine may run hot, overheat or display an over-temperature indicator the dash. If this happens, dealer service technicians will perform an engine overheating diagnostics test as indicated by the vehicle’s Service Information. If the test does not isolate the root cause of the overheating condition, the issue is likely a faulty ECT sensor that may be reading noticeably cooler than the other ECT readings, which can affect the position of the engine Coolant Control Valve (CCV) and limit the amount of coolant entering the radiator.
The following GM vehicles with the turbocharged 2.0L I4 LSY engine may experience this issue:
- 2021-2022 Buick Envision
- 2019 Cadillac CT6
- 2020-2022 Cadillac CT4
- 2020-2022 Cadillac CT5
- 2020-2022 Cadillac XT5
- 2020-2022 Cadillac XT6
- 2020-2022 Chevrolet Blazer
- 2020-2022 GMC Acadia
To be clear, these vehicles are not under an official product recall at this time. It’s unclear how many units may be prone to experiencing the running hot/overheating condition described above.
The LSY is a turbocharged 2.0-liter four-cylinder gasoline engine produced by General Motors for use in a broad range of vehicles. The engine was first introduced on the now-discontinued 2019 Cadillac CT6 full-size luxury sedan, but is now offered in a wide range of GM products. In its most powerful form, the LSY engine produces 237 horsepower and 258 pound-feet of torque. It’s paired with two different GM transmissions across the automaker’s portfolio, including the GM nine-speed automatic for front-wheel-drive based models and GM 10-speed automatic for rear-wheel-drive based models like the CT4 and CT5.