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Old 03-28-2011, 10:10 AM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 45,064
 

2003 L-Series 3.0L Sedan
Default Re: Need help replacing a bad ECM

1-Why are you replacing it? Are you sure its blown? What are the symptoms?

2-All ecm's are already programmed if they came from donor vehicles; they do not require anyone to reprogram them. Other than resynching a used ecm to your car's electronics (needing 3 -10 minute cycles with the ignition ON each time) these are almost plug n' play. The relearning required is to have the ecm learn a fuel password from the bcm (or vice versa) so the anti-theft system within the bcm doesn't reject this new ecm. If you can find a matching ecm, use it as is.

Search for the procedure about the relearning steps.
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