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Wont start after changing ECM

Tiny
CBELVILLE
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
Computer problem 6 cyl Four Wheel Drive Automatic 91000 miles

i just change the ECM on my 2004 trail blazer. And now it will not even turn over. I disconnected the the battery before installation. Installed the re manufactured ECM(got from auto zone) I gave them the VIN the engine size 4wheel drive. They told me it was flashed. I installed the ECM and now it wont turn over. I tried to unlock cause of the security system and that didn't work I opened all the doors. I tried to cycle the key that didn't work. I dont have a lot of money so if you can help that would be outstanding.

thank you chris
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Monday, February 8th, 2010 AT 8:56 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,624 POSTS
Hello,

The ECM and theft system must be programmed with a tech2 scan tool at a dealership. There is no way for the computer to recognize the networker without the proper protocol to initiate service. I am not sure what Autozone is doing but they should know this.

Please let us know what happens.

Cheers, Ken
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Thursday, December 7th, 2017 AT 8:19 PM

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