you may need to have the trouble code figured out, most shops can do this, transmission shops often do that for free.
How do I reset the service engine light on a 2003 Chevy Trailblazer?
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.
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.
I reset the check engine light on my jeep by disconnecting it from the battery.
time for an oil change
You have to remove the instrument cluster to service the light bulbs.
I was told by a co-woker that if you disconnect the negative battery cable for about 20 minutes or so that will reset the service engine light.