Because the computer has detected something that needs to be resolved. Use a code scanner to find out what problem code the computer has store.
How do you reset check engine light for the 2009 Chevy trail blazer?
take it to autozone they will check for free. wolverine Probably some problem with the smog controls. Probably nothing too major. If the service engine light is flashing, it's probably major.
try disconnecting the battery for a half an hour. If this doesn't work you will need to take it to a shop and have it turned off.
You can either bring it in to a Chevy dealer or use a programmer/tuner to reset the check engine light.
You need to have it checked for codes. If you fix the cause of the codes the light will stay off.
If the check engine light is blinking that means an engine cylinder misfire has been detected
Check
The check engine light (service engine soon) comes on and stays on when a problem is detected by the self diagnosis system of your vehicle.
It requires an engine scanner to do that.
No, only a problem that effects emissions will set the check engine light.
A flashing check engine light is an indication of a misfire.
That REQUIRES an ENGINE SCANNER to do that.