All codes
Service call
SC370
Drum potential sensor error
BPCU / developer
Level B — stop, power-cycle may clear
First check
More common on high-end / Pro. On IM C this often rides along with PCU/charge issues.
What it means
Drum potential (Vd/Vr) sensor failed or is out of range.
Likely causes
- Potential sensor
- PCU
- Charge
On-site steps
Parts to have on the truck
- Potential sensor
- PCU
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.