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How to Repair a 2006 Chevy Trailblazer Check Engine Light

by Alibaster Smith

Your 2006 Chevy Trailblazer's "check engine" light comes on when there is a problem with the sensors on the vehicle. The engine codes can be read with an onboard diagnostic scan tool. This scan tool connects to the electronic control unit and retrieves the codes so that you can repair your Trailblazer. When you've fixed the vehicle, you'll need to reset the "check engine" light. If you don't, the error codes will remain stored in your Trailblazer's electronic control unit.

Step 1

Open the hood of your Trailblazer and loosen, but do not remove, the nut that holds the negative battery cable clamp to the negative battery terminal.

Step 2

Slide the negative battery cable clamp off of the negative battery terminal.

Step 3

Wait 15 minutes and then reconnect the battery terminal. This will reset the electronic control unit. Once the battery has been disconnected, the memory is cleared along with the engine error codes. Reconnecting it forces the electronic control unit to restart.

Start your engine to verify that the "check engine" light is off. This should fix your check engine light problems.

Warning

  • If you haven't fixed the underlying problem, the sensor or sensors that have malfunctioned, then the light will come back on again.

Items you will need

  • Socket wrench
  • 10mm Socket

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