2003 Chevy Trailblazer service engine soon light?
Same happened to me. It would come on, then a few days later it would go off. Took it to Jiffy Lube for an oil change, and they came in and told me that the connector to the light was loose. So they pluged it back in. And its fine now. I believe Auto Zone does a free diagnostic test. You could do that to see if anything is wrong first. Hope that helps
Alot of times your local auto parts store will have free check engine light reader. Make sure you attend to the problem if one exsists but they should be able to reset it for you at no charge (Autozone for example). Not sure with the trailblazer but sometimes if you disconnect your battery for a hour or so it will reset the computer. Auto part stores scan for CEL (check engine light). The service light…
Turn the ignition key to the run position but don't start the engine; let the initial bells and whistles quit dinging then within five seconds of eachother, pump the fuel pedal 3 times fairly slowly, then turn the key back to the off position. If light is still on, repeat, in a little more timely fashion.