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Is there a way to check the computer module on a 2003 Buick rendezvoous

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Check it for what ? Hooking up a scan tool is the best way , checking DTC'S - diagnostic trouble codes ! If it shows no communication on the scan tool that's when you start testing power an grounds . Other then that you can't do anything . Only the factory know's what software is programmed into it !
ECM Inputs and Outputs Diagnosis

Posted on May 16, 2017


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