01lb7duramax.
New Member
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