All codes
Service call
SC364
HDD error (older numbering)
BController / HDD
Level B — stop, power-cycle may clear
First check
On current GW+ this is 853/860. Reseat/replace the disk.
What it means
HDD error (older numbering). Confirm the exact subcode against the FSM for this serial — meaning can shift by generation.
Older engines logged disk as 364–366.
Likely causes
- On current GW+ this is 853/860. Reseat/replace the disk.
On-site steps
Parts to have on the truck
- HDD/SSD
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.