Chevy/GMC Duramax 04.5-05 LLY Discussion of Chevy and GMC Trucks with LLY Duramax Turbo Diesel Engines

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Old 04-20-2011, 07:38 PM
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Join Date: Apr 2011
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I have a 2005 duramax that i replaced the longblock. The old one was knocking at 300,000 miles. I reused all original wiring harness and ecm. Now here is the problem, the truck will not spin over with the key, and has no communication with the scan tool, i have checked all fuses, all wiring connections, and used a remote starter button to verify the starter is working, the security light IS NOT ON. The batteries were disconnected for about a week during engine swap.
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Old 04-20-2011, 08:08 PM
BriteWhiteRam's Avatar
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Join Date: Mar 2009
Location: Alberta, Canada
Posts: 1,070

You may have killed the ECM, I would check all your wiring connections going to the ECM
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