03-12-2019, 07:04 PM
Join Date: Jan 2011
All oem pcm it seems are skim capable. Any pcm plugged into a truck that is skim enabled (gray key) with its immobilizer connected will cause the pcm to become skim active. The immobilizer has a ring around the ignition switch that reads the key when inserted. The key has a pin that the immobilizer must recognize. If recognised the immobilizer then transmits a secret pin to the pcm to operate. If the secret pin is not recognized, the engine is allowed to crank something like 5 attempts. Then locks the pcm and prevents it from further cranking. Once a pcm becomes skim active it cannot be deactivated. I posted earlier a link to a place that has stated they can remove the active skim from the pcm. But I don't have experience with doing this. A new pcm is skim capable, but not skim active until plugged into an ignition that has a immobilizer. It then becomes skim active. A skim active pcm can be set to skim blank and I think can be used without the immobilizer plugged in to run properly, but with a DTC secruity fault. At this point all I can say is don't plug in your clean (black key) pcm into a skim enable truck.
2003 RCSB, 2wd, "Pro-Street"
6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...
1956 Jeep Willys Pickup Hemi powered "Street Rod project"
1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected]
Current 60' PB 1.351 (2019) mechanical issue for 1/4m
HTC 2018 TOTY
Support vehicle- 2007 QC G56 4x4 diesel