2007 Mack chn613 6-4 code?

[dirt dobber]

I’ve got a 6-4 code on a 2007 Mack chn613 the lighting bolts comes on and the engine will idle up a couple hundred RPM’s fir a second then light turns off and back to normal can someone tell me what the computer reading is or something. Any help is greatly appreciated 

Edited January 2, 2018 by dirt dobber

[Mackpro]

Your loosing J1939 com data line from engine ECM to vechicle ECM. It causing Idle to go to 900 rpm.  Most common issue is coolant in the engine ECM. Unplug all 3 connectors on the engine ECM and check for rotted pins.