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Chevrolet does not use inertia/reset switches.
To reset the computer disconnect the battery for several minutes then reconnect.If the check engine light is off after reconnect then your computer has been reset.
How do I reset the service engine light on a 2003 Chevy Trailblazer?
How do you reset the computer in a 04 blazer 4.3L
disconnect the battery
When you change the battery you automatically reset the PCM. Any time you remove the negative battery cable for about 15-20 minutes you will reset the PCM. This will reset your Check engine light also. www.trailvoy.com Trailblazer enthusiasts forum with all the answers for your Trailblazer.
The check engine light on a Chevrolet Colorado can be rest by connecting an OBD II code reader to the vehicle's computer . Each of the codes can then be reset which will turn the associated light off.
The check engine light problem will have to be repaired in order to have someone with a scanner to reset it. If the repair is not made then the light will come back on immediately.
After repair, you reset with a scan tool.
In general, since you replaced the engine, you most likely disconnected the battery - and that should have reset the codes. If you are getting new codes, something is wrong. Perhaps you have a wiring error or a disconnected sensor. Perhaps one of the sensors is bad.
Why? Just reset it.
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 is different. It usually means your vehicle has hit a set number of miles for a certain service recommended by the manufacturer. I'm not sure about the trailblazer, but my silverado has a reset procedure. Turn key on, pump gas pedal 5 times, when the light flashes press the odometer reset button. Trailblazer might be different, but probably something close.