See this thread. http://forums.trailvoy.com/showthread.php?t=51217
How do I reset the service engine light on a 2003 Chevy Trailblazer?
take off the battery pole and set it up again.
need help changing the belts on my Chevy trailblazer lt 2003
No
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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.
To reset the service engine light on a 2003 Chevy Trailblazer, you can use an OBD-II scanner to clear the trouble codes. Alternatively, you can disconnect the negative battery cable for about 15 minutes to reset the system. After reconnecting, ensure that the light is off; however, if it reappears, it indicates an underlying issue that needs addressing. Always consult a mechanic if you're unsure about the cause of the light.
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