Does the ECM have to be reflashed? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dmccay0878 · 01-08-2019, 02:49 PM

Just starting my research on doing the LS swap to my 68 C10. If i buy the engine, trans, pedal, ecm, etc all from the same donor car, does it need to be reflashed? If so, why?

FL72GMC · 01-08-2019, 03:32 PM

Typically yes. You want to remove the VATS (Vehicle anti theft system). Most of the time you want to remove the 2nd o2 sensor also.

dmccay0878 · 01-08-2019, 06:22 PM

Thanks

01-08-2019, 02:49 PM	#1
dmccay0878 Registered User Join Date: Jan 2018 Location: Bristol, PA Posts: 11	Does the ECM have to be reflashed? Just starting my research on doing the LS swap to my 68 C10. If i buy the engine, trans, pedal, ecm, etc all from the same donor car, does it need to be reflashed? If so, why?

01-08-2019, 03:32 PM	#2
FL72GMC Registered User Join Date: Sep 2018 Location: Cocoa Beach, FL Posts: 12	Re: Does the ECM have to be reflashed? Typically yes. You want to remove the VATS (Vehicle anti theft system). Most of the time you want to remove the 2nd o2 sensor also.

01-08-2019, 06:22 PM	#3
dmccay0878 Registered User Join Date: Jan 2018 Location: Bristol, PA Posts: 11	Re: Does the ECM have to be reflashed? Thanks

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