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.
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Comments
Yet another fine example of that new GM quality.
Meanwhile my 2002 GMC Sierra with 262,000 miles on it has never overheated and is still on the original thermostat.
#RealProfessionalGrade
I had a Pontiac Montana SV6 extended that lasted 16 years… a few sets of tires, a new battery, regular oil changes, and an exaust repair… was a great vehicle…
Come on people is there no quality control at GM anymore ???? This is uncalled for in todays day and time.
Another example where a simple mechanical device (thermostat) is replaced by sensor/control valve loop. What could go wrong?! Seems GM has forgotten about the KISS (keep it simple, stupid) principle.
Yes but don’t forget, they need to make it complicated so you can’t fix it yourself
I confess for a while I had stuff-lust for a car with this type of engine. The problem doesn’t exactly put me off but it does remind me to do my homework.
Not happy to hear this, looks bad for GM. I still have faith in GM & Ford, do Not want to buy a Asian or German vehicle. But come on guys, you have to help us out!
*I still have faith in GM & Ford*.
Such a gullible fool. When you suffer severe financial pain due to your stupid blind loyalty then you’ll learn.
My last GM product, a 2006 Pontiac Montana SV6 lasted me 16 years… a few sets of tires, two front wheel bearings, a muffler, a battery, and regular oil changes. I think that is pretty good value for the money spent… So much so that I just bought a GMC Acadia Denali AWD V6
There are Asian and German brand vehicles built in the US.
Probably quite a few more models than what GM and Ford are still building here.
This is a simple case of using the lowest bidder to supply parts.
How do you get this through to Mary. We want quality….
Or is it necessary to get rid of Mary?
The domestic and foreign automakers use the same suppliers more than you can imagine, Asian brands are having just as many issues as they increase sales, it’s hard to keep quality perfect with higher volumes of production. Kia and Hyundai have had a lot of issues with the 4 banger. A sensor is easier to repair than the entire engine, LOL! European brands have the worst reliability, except for Jeep which is worst. The global supply chain is going to be a problem from here on out. Factories can’t find enough workers, young people don’t want to work anymore. It’s hard for dealerships to find qualified technicians and technology is changing rapidly making it difficult to stay ahead of the game. I have been in the industry for five decades and it’s amazing vehicles are as reliable. Until the 70’s cars only had a 1 year or 12,000 warranty and they had no technology. Muscle cars didn’t have any warranty!
>> European brands have the worst reliability, except for Jeep which is worst.
That doesn’t match up with the articles that we keep seeing, even on this very site.
Yes I agree on the same supplier but if you put a sensor in the exhaust stream that runs as high as 1000 deg and the mfg is using said sensor rated for 1000 deg you are going to have issues.
There is a 10 to 15% rule. Problem is that is still way to close to the tolerance of the sensor.
Today’s diesels run hotter exhaust temps than that. That sensor should be made to tolerate 1500 deg. And that is not what is happening. Because it would cost more.
Most of these issues are because MFGs are trying to lower production costs and increase profit..
Toyota of the past (not the present) was noted to be the most reliable auto mfg.
Ether costs have caught up with them or poor engineering has….
As for German vehicles. Keep it simple has never been in there vocabulary.
My 2022 shows as overheating for the first five to ten minutes of start up in the winter after being remote started.(i dont remote start in the summer) I don’t think it is actually overheating however the faulty ect sensor in this bulletin has already been replaced and it was better for a couple months and came right back.