This is most likely a faulty ignition switch. It is a common failure in the early trucks and should solve the majority of your problems listed.
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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.
How do I reset the service engine light on a 2003 Chevy Trailblazer?
Usually a problem in the emission control system - have vehicle scanned to determine the problem
replace it
The "service 4 wheel drive" light is on because the TCCM (Transfer Case Control Module) has detected a problem with the system. The light will remain on until the problem is fixed. Your local auto parts store can read the code(s) in the TCCM. The code(s) will help determine what the problem is.
A parental control service includes content filters- which limit access to age appropriate content, usage controls, computer usage management tools, and monitoring.
The computer that controls the 4wd has detected a problem and set a trouble code.
It will not be possible, because if it was, the value of the access control will be zero and most access controls work with micro processors, that is preprogrammed and only registered service company's have access to the manuals.
NO, the service engine light means that a scheduled service is due. Usuallly this means an oil/filter change. However if the Check Engine light is on this can be serious, and means there is a problem with the emissions controls.
Power train control module problem.
The common vacuum leaks on the 2004 Trailblazer are usually from the dashboard. It is therefore important to service them regularly.
had same problem w/ my "03. go to dealer and there was an update for it and he "flashed" the computer with their handscanner and it updated the problem from GM w/software fix. light was gone