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P1711 problem help!!!

01lb7duramax.

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Location
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The truck is a 01 with the allison 1000 has 325k miles just got new clutches installed in the trans put it back to gather boom limp mode with a p1711 pressure switch E stuck closed checked internal garment replaced pressure manifold took valve body apart had a sticking valve so replaced the valve body reassembled same code again with a brand new valve body everything torqued could a bad nsbu switch cause this code as well I know that would be unusual but I need some help here took it to the chevy dealership and they told me it needed a valve body but I just in installed a brand new one
 

THEFERMANATOR

FRANKENBURBAN
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A sticking e valve is one of the most common allison problems there is. The e valve reamer(more so a sizing tool) was one of the 1st tools I bought. If any debros gets in there swapping the valve body, it is pretty common for it to stick the e valve. And swapping the valve body is no guarantee the replacement isn't the same way. As to the nsbu, it will not set a pressure switch code.
 
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