Should I trust this Kenmore error code?

[hatrabbit]

My Kenmore 417.48102701, when any cycle is started, activates the door lock and that’s all.  When going through its step test, the blinking lights indicate an E56 error.  This is a problem with the motor or speed controller.  Makes sense, the motor never spins during the step test.  The motor ohms out as it should… but before ordering a speed controller, I’d like to run this by you experts to confirm that this is likely the problem.

The reason I have any doubt at all is that when I try to view the code by pressing Start & Pause/Cancel, the lights do the 5 blinks for the first digit but just do a quick flash for the second digit and return to normal standby appearance.  Should I trust the clear '5-6' I see during the step test or should I suspect a bad main controller for giving me conflicting codes?  Also, does the fact that the machine doesn't even fill with water cast doubt on the motor being the issue?

Any advice here will be greatly appreciated.