More than likely it is a code for a local service from PA.  To workaround this, there is a selection for W-2 Box 14 in TurboTax that states "other mandatory state or local tax not on above list" or you can select the option of "other - not on the list."  As noted in the link below, TurboTax will determine if more information is needed to determine if the amount impacts your return or not. 

Here is more information on Box 14 of the W-2:

https://ttlc.intuit.com/replies/3301932