You need to connect a OBD-II Scanner to find out.....
It requires a scanner to properly diagnosis a check engine light.
Either try disconnecting thebattery for about 10 mins. or have vehicle scanned to determine the problem
How do you reset check engine light for the 2009 Chevy trail blazer?
Replace your thermostat had same problem it sets a code but no check engine light
Several things could cause the 2001 Impalas check engine light to stay on. Since so many things could be wrong, check the computer codes for any leads on possible problems.
You can either bring it in to a Chevy dealer or use a programmer/tuner to reset the check engine light.
Use an OBD scan tool to reset or disconnect the battery
It means that the engine computer has detected a malfunction that will affect the emissions of the vehicle.
If the check engine light is blinking that means an engine cylinder misfire has been detected
The check engine light will illuminate.
Check