have vehicle scanned to determine the problem - usually in the emission control system
How do I reset the service engine light on a 2003 Chevy Trailblazer?
Go to Auto Zone and have the computer codes read for free.
A flashing check engine light is an indication of a misfire.
Maybe you should service the engine soon. :P
can you tell me why my 1999-2000 Chevy trailblazer light is on
Check
When service engine light is on on a 2003 Chevy Trailblazer, the problem could be a faulty thermostat, a circuit range performance problem, or any other problem.
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That requires an OBDII engine scanner.
That means that the computer see's a problem with the emmission system are the transmission. Need to have engine scaned with a engine scanner to see what is going on.
If you are referring to the Check Engine light then the bulb is either blown or has been blacked out on the dash by a crook.