SC857

What it means

USB interface error. Confirm the exact subcode against the FSM for this serial — meaning can shift by generation.

Likely causes

• USB device or port. Unplug everything on USB, reboot, then the USB board.

1. 1Read historySP5-990. Note the subcode and anything logged in the same minute. The standing number is often the last, not the first.
2. 2I/O then FRUSP5-803 / 5-804 on the related sensor or motor. Likely FRU: USB I/F.

Parts to have on the truck

• USB I/F

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