I have been retired for a while and am not up on the current codes but 6 or 7 years ago we could use a ground rod at a sub panel as long as there was no other conductor running between the building containing the main service and the outbuilding that could act as a ground fault path. In other words if there was a metal gas pipe, metal water pipe, metal conduit, or according to our local state inspector even a telephone line, you had to pull a 4th conductor for a ground fault conductor. In the 2002 code that was spelled out in the code section 250:32
Whether you use a ground rod or a 4th conductor as a grounding conductor (NEC calls this the Equipment Grounding Conductor) the ground and the neutral (NEC calls this the grounded conductor) have to be isolated in the subpanel.
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