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I just had this happen today on a service call. It is an evolution controller. 48kw 5.4l liquid cooled engine. Checked canbus wiring. 1.97vdc on wire 744 to ground and 2.57vdc on wire 743. As per generac troubleshoot this is acceptable voltage. Rung out wires from controller to ICM. So next step is to change out xontroller. Still canbus error. Un hooked battery( charger is already unhooked) re hook up battery. Input 13 pram and 26 v code on new controller. Can bus error disappears!!! Try to start unit, unit seems to crank at low rmp. Call teck support, they suggest new battery and starter, even tho existing battery and unit are only 2 years old. Replace starter, same thing. Code reappears!! Try new ICM im at it! Still cranks slowly and code reappeared. Triple check wiring voltage, continuity and ohms( 133 ohms). Am at a total loss as to what the solution to this problem may be. Any help would be greatly appreciated.
hi, having same problem, did you ever figure it out
 
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