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The description of this code is 0893 Hydraulic fault in transmission.If the transmission pan was not removed and checked for metal and debris this needs done.If full of metal and debris then the transmission has internal mechanical component failure and usually does require full replacement and can be very common for this code here.
The other issue is the valve body itself but this is only if there are not metal or debris components in the transmission pan itself.If there is no metal or debris in the pan I would ask them if they can test the valve body to see if it is the only component needing replaced but keep in mind this can start out as a valve body fault and if not taken care of right away can damage the internal transmission mechanical components.
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The valve body is located just above the transmission pan when the pan is removed.It is held in place with several bolts that are removed to drop out the valve body.The valve body works with allowing the transmission to shift and controls fluid pressure with electronic solenoids in the valve body that actuate to properly flow fluid through the valve body to the transmission components.If there is any metal fragments or disc like material in the pan this indicates a problem mechanically with worn or damaged components in the transmission with the transmission usually needing replaced.Some places may offer a rebuild but most of the time it is a replacement as sometimes not all components are available to rebuild it.
I show a cost new for this complete transmission of $7130.00 so a used or rebuilt one can run around $5k.You can also try and locate a good used one at http://www.car-part.com
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The metal fragments come from internal mechanical components in the transmission itself like clutches or discs or even gears in some cases.The valve body usually does not throw out metal fragments as it is a fluid passage unit and not a mechanically moving component that can throw out metal fragments like this here.If there are metal fragments in the pan then usually a complete replacement is needed unless a facility in your area is willing to remove your transmission and take it apart for inspection and repair but in some cases repair can cost more then replacement all depending on what needs done and adding up labor time to repair it unfortunately.