If the motor in an RV power step is bad you will usually not hear any sound from it when you apply power. You can test it directly with 12V power from a battery, bypassing much of the associated electronics, to confirm the motor itself is bad. Applying power right at the motor terminals will tell you if the motor or the circuits feeding it are bad.
If the issue is the mechanical linkage you will typically hear bad noises from the step as it extends or retracts.
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