All codes
Service call
SC670
Engine–controller communication (engine side)
BCommunicationsCommon field call
Level B — stop, power-cycle may clear
First check
I/F cable, then firmware, then IOB / controller.
What it means
Engine lost the controller. Often together with 672.
Likely causes
- I/F cable
- Firmware mismatch
- IOB
- Controller
On-site steps
Parts to have on the truck
- Engine I/F cable
- IOB
- Controller
Related codes
Confirm the subcode and part number in the FSM for this serial. Raicoh is a field companion, not a replacement for the book.