Finding out what is causing problems with your Chevrolet Trailblazer is an easy procedure if you have the proper diagnostic equipment. Your Trailblazer's electronics system includes an onboard diagnostic computer known as OBD2, which will output unique error codes for failing electrical and mechanical components on your Trailblazer. You can often have a code scan performed for free by your Chevy dealership or at an auto parts store. You can also purchase your own OBD2 code scanner so that you can perform a diagnosis whenever you like.
Determine the location of the OBD2 diagnostic port in your Trailblazer by referencing the owner's manual or by feeling around the area below the steering wheel, near the top of the driver's side foot well. The diagnostic port will be approximately 2 inches wide.
Plug the diagnostic code scanner into the diagnostic port.
Turn your Trailblazer's ignition to the accessories position, if your engine will not start, or turn it on all the way if your engine will start, so that the electronics are turned on and the engine is idling if possible.
Allow the code scanning tool to perform a code scan and take note of any error codes that are displayed on the code scanning tool.
Bring your error codes to a Chevy dealership, auto parts store, mechanic, or perform a web search, to find out what the error codes represent. By finding out what specific components are broken, you can save time diagnosing the issues and begin the repair process sooner.
