Just to clarify. Diesel Engines. The security code is implanted in the ECM, it cannot be removed or changed. The same code is stored in the BECM. When the ignition is turned on the BECM sends it's code to the ECM. If they match the the ECM becomes active. Out of sync is when the BECM code becomes scrambled and does not match the ECM security code. The engine will turn over but will not start. I believe the GEMS is similar. On the THOR the engine will not turn over in an out of sync state.
Yes correct,but in my experience in an out of sync condition a GEMs will not turn over, but I believe a Thor will .(I have not experienced a THor out of Sync,but is based on what I have read,)