TAILGATE LOCKING PROBLEM

[my mucker]

Hi all,i have looked through threads for my problem, but did not find what i was looking for.My tailgate is not locking with fob or with the key ??? when i finally lock it (after quite a few minutes) I cant open it with fob or key, and vice versa, all other doors are ok !i have had door card off removed the papery cover looked in and couldn't see nothing wrong ??? all the locking and opening noises are there,the lever is moving left and right,but doesn't lock and open properly,i have given it a good spray with WD 40 but still no joy , can anyone shed any light on my problem please , THANKS Gwyn

[ffrenchie]

Has the striker plate moved and when it doesn't lock do the other doors reopen like when you try to lock with one of the doors open ?

[my mucker]

hi Ffrenchi, ye everything is fine apart from the rear door not responding !!! striker plate is ok,what i have noticed is when i open the rear door with the key,i have to hold the key in the open position and pull the handle with my other hand,if i use key to open the rear door then take key out !!, the door remains locked !! and when its unlocked and i lock the rear door and take key out it remains open !!ps it does lock and unlock !!! but not when i want it to,i am there quite some before i get it to operate properly, Regards Gwyn