648g3

[Fllogger]

I have a 06 648g3 that has been defueling. When we take the wiring harness off of the black box on the side of the motor an clean it an put it back on it runs like a beast. It may work for 2 days or 2 hrs. Jd came out an their computer wouldn't read the machine. I'm wondering if anyone has had this issue before.  I'm wondering if it may b the black box or the wiring harness.  Thanks in advance.

[kiko]

Are there any codes when the engine is in derate?   Some models use F codes.  If so you would have F475( engine in derate condition) and also the code that is causing derate.