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I am wondering if anyone knows? Can GM determine that you've switched computers? I want to buy a new computer, tune it and keep the factory computer unchanged incase I would need to go to the dealer for service.

Thanks in advance for your help.
 

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Because they designed and engineered the car.

This has been discussed numerous times. It all depends on what your bringing your car to the dealer for. If you want a custom tune, then make sure you get a good one so you dont break anything. If your window wont roll up, they wont void your warranty because you have a not stock pcm.
 

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Actually they cannot!

if you buy it from a person that can reprogram your VIN# into said ECM then you just unplug the old one and plug in the new one and VIOLA' your golden.

It's a trick us LNF guys are using to keep our warranties. (well not me I don't care, but others are)

Now if you buy said a tuned ECM from OTTP, ZZP, etc. Then yes they can tell! But if you get a STOCK...OE... Factory ECM reprogrammed to your VIN then they cannot tell the difference!
 

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Actually they cannot!

if you buy it from a person that can reprogram your VIN# into said ECM then you just unplug the old one and plug in the new one and VIOLA' your golden.

It's a trick us LNF guys are using to keep our warranties. (well not me I don't care, but others are)

Now if you buy said a tuned ECM from OTTP, ZZP, etc. Then yes they can tell! But if you get a STOCK...OE... Factory ECM reprogrammed to your VIN then they cannot tell the difference!
and who can do that? pm me
 

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They will wonder what happened to the ECM that was in the car when it was built . It has a serial number that is on the Vehicle Componet sheet in GMVIS . All they have to do is put your VIN in and get the original's SN then compare it to whats in the car.
 

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why not buy a second ecm and tune that one? just leave your stock one alone so if something happens you just put that back in?
 
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