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I wouldn’t be surprised if the dealership didn’t even bother cleaning the throttle body and plate first before suggesting a replacement throttle body. Over time, grime and carbon buildup can affect the throttle plate from opening/closing correctly. It’s easy to clean as throttle body cleaner sprays are readily available at most local auto parts stores. The best way to clean it is to remove from the intake manifold, unplug the connector and work both sides of the throttle body and plate. But in doing so, you would need a full range scan tool in order to set/calibrate the throttle body plate back to its correct, closed position or anytime the throttle body harness is disconnected.
 

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Anytime the throttle body connector is unplugged or when the plate is manually moved which is necessary when cleaning the throttle body and plate, a series of learning procedures is necessary. First is the throttle body closed position, followed by the idle air volume learning procedure. Best to do these procedures via full range scan tool.
 
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