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Is it safe to disconnect the ECM, TCM and/or engine harness connectors without disconnecting the batteries (As long as the ignition is off)?
 

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Well, technically you should disconnect the battery first.. but I disconnect them all the time without disconnecting the battery. I've never had a problem yet. Knock on wood.
 

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Just make sure the key has been of for 1 minute prior to disconnecting and you will not have any trouble.
 
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