This is part 2 of the ZF8HP70 in the Dodge Durango, after repairs this is the code i had, P1B14 it was due to low pressure because fluid level was low. There are other issues that can cause this problem such as a bad MV2 or MV3 solenoid. When the code first shows up, they say to clear it and see if it comes back. If your going to service this trans, thats fine but you may want to see how much fluid comes out so the same amount goes back in. Thanks for watching. Happy Holidays