All codes
Service call
SC403
Transfer belt position sensor
BTransfer / HV
Level B — stop, power-cycle may clear
First check
ITB HP/position sensor. Reseat the belt, clean the sensor.
What it means
Transfer belt position sensor. Confirm the exact subcode against the FSM for this serial — meaning can shift by generation.
Likely causes
- ITB HP/position sensor. Reseat the belt, clean the sensor.
On-site steps
Parts to have on the truck
- ITB HP sensor
- ITB
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.