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This depends on the vehicle. If the thermostat is stuck open the engine won't get to the proper operating temperature which could trigger the MIL (check engine light).

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Q: Can bad thermostat make server engine soon light come on?
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Will installing a thermostat backwards make problems with check engine light?

It could cause the check engine light to come on with a code concerning cooling system/thermostat performance.It could cause the check engine light to come on with a code concerning cooling system/thermostat performance.


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A defective thermostat can cause the engine to overheat. It can also cause the engine to not reach full operating temperature if the thermostat is stuck open. It is possible this could set the check engine light.


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It means that the engine is not warming up properly, possible thermostat failure.


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I would suspect the thermostat is stuck open. Replace the thermostat.


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It sounds like the thermostat is opening up late causing the engine to almost overheat before it opens. Replace the thermostat.


Why does your thermostat light come on and what can you check on 1998 GMC Sierra Chilton truck?

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Can a check engine light indicate a bad thermostat?

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Why would the service engine light come on on a 94 camaro V6 and be hard to start when cold after replacing the thermostat?

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Can a bad thermostat in your car cause your check engine transmission light to come on?

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