2002 CHEVY TRAILBLAZER HOW TO REPLACE THE ECM (PCM)

  • Tiny
  • chabunga
  • 2002 Chevrolet Trailblazer

Engine Performance problem
2002 Chevy Trailblazer 6 cylinder Four Wheel Drive Automatic 84000 miles

How do I replace the ECM? I am not even sure where it is. What do I replace it with? I have seen where I can buy reprogrammed ECM's. But I have also been told I have to have it programmed after install. Thanks in advance.

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Saturday, November 28th, 2009 AT 8:52 AM

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  • Tiny
  • racefan966
  • Expert
  • 5,136 posts

It is not to hard to do. First disconnect the battery positive cable first (and when putting battery cables back on put positive back on last). Now find the PCM it is on the intake plenum front part on the left (drivers) side of the engine. Now remove the bolts that hold the wiring harness on to it and unplug them then loosen the four bolts that hold the computer onto the intake and remove it. Replace in reverse order. Now you must take the truck to the dealer to be programmed to you truck. There are no pre-programmed computers for you truck as it needs to be flashed to you truck according to your vin number. I must ask why are you replacing the computer? Here is a picture of the computer and one of how it is mounted on the intake.

Computer


http://www.2carpros.com/forum/automotive_pictures/249564_296254_1.jpg



How it is attached


http://www.2carpros.com/forum/automotive_pictures/249564_Graphic_156.jpg

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Saturday, November 28th, 2009 AT 9:03 AM
  • Tiny
  • chabunga
  • Member

The "Service Engine Soon" light has been coming on and one time we had a light come on that said something about Reduced Engine Performance. I went to Autozone and they ran a scan when the "Service Engine Soon" light was on. The code was P0601. They said the ECM needed to be replaced. They are telling me if I supply VIN, year, make, model, engine size, OEM number of ECM I will receive correct flash computer. Flash technology unit pre-programmed at the factory

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Saturday, November 28th, 2009 AT 9:19 AM
  • Tiny
  • racefan966
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  • 5,136 posts

This has to do with PCM memory. What is recommended before replacing it is to have it cleared and see if the code comes back. If it does then replacement is needed. With all the proper information year make model Vin number then yes you can get a reprogrammed pcm.

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Monday, November 30th, 2009 AT 8:18 PM

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