Suzuki GSF1250 Service Manual page 561

Step
3 1) Check that the front and rear wheel speed sensors are
mounted securely.
Are the sensors mounted securely?
4 1) Delete DTCs and repeat the code output procedure.
Refer to "DTC (Diagnostic Trouble Code) Deleting
(Page 4E-25)" and "DTC (Diagnostic Trouble Code)
Output (Page 4E-23)".
Is the DTC "55" (C1655) output again?
Action
I718H1450097-01
FI
I718H1450122-04
Yes
Go to Step 4.
Replace the ABS
control unit/HU.
ABS: 4E-68
No
Tighten the mounting
bolts or replace the
bracket if necessary.
Intermittent trouble.