oilwell1415
Well-known member
Anybody ever had an issue with an SCT tuner not producing the 18v FEPS signal needed to unlock the PCM? I bought this tuner a few months ago and have been fighting with it since I got the truck back together a month or two ago. SCT tech support has been completely useless. They say since I don't have that 18V signal that my PCM is bad, but according to both their literature and my testing the X4 is supposed to be putting that out and it's only sending 17.5V.