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Discussion Starter #1
Does anyone have a link to directions on how to reprogram an ecm? Any advice on whether I should do this myself or buy one already programed and if so who would you recommend?
 

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What kind of reprogramming are you speaking of?

Are you talking about changing the tune for performance/fuel economy?
 

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I dont think so. We've been told the computer needs to be replaced. I'm trying to avoid spending 650 on a new one installed since the car has 100K miles. Ive researched it a bit and can see where I can buy a reconditioned/reprogrammed with VIN computer for 170-300. I also see where I can buy one that has not been reprogrammed with VIN for 30. I have no idea how much is involved in reprogramming so I figured I'd ask. I'm fairly tech savvy and my dad knows cars well and might be able to do it with some direction.
 

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What year cobalt are you working on?
There are several here that might be able to help you out if you give enough info.

Also, why do you think you need or may need a new ECU?
 
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