Quote:
Originally Posted by carkrazy1987
is the cts v ecm new, or used? could be corrupt tune when loaded into ctsv ecm, have you tried writing stock tune in, then retune with modded tune. also unless engine was at operating temp, you cant run a cam crank relearn.
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Refurbished unit newly flashed with CTS-V OS. I have about concluded it is because of a difference in the GMPP harness/ECM VS production ECM. I tried a third production ECM & it didn't work either.