P38 transfer issues

ok where to start.

Done 200 mile trip and parked the car up. When i came back to the car in the morning the gear selector was flashing "SELECT NEUTRAL" I tried changing between the ranges which it seemed to done but didn't clear the fault. I then drove around 2 miles with the message where i pulled in. Selecting low then high and pressing the sport button the fault cleared and off i went. Parked the car up again. When i returned on the evening everything was fine, drove home parked up and thought dam thing. Got in the car this morning same fault. Did the same as i did the following morning but this time it stayed in low!! Drove home in low around 1 mile as started to think that it must be the tranfer motor. I changed this for another and it still doesn't work. So i took it back off and tested it on the bench and it spins fine so no problem with the motor. I then changed the gear selector display board and this seemed to work. Then it stopped working again. I have tried putting in the fuse to select transfer neutral but even this doesn't seem to send a signal down to the motor.

Help needed badly as only car!!!

only help i can give you is transfer box ecu is a common failing, was with mine when it wouldnt select low range i like you thought motor and changed as i had a spare but when i actually looked into it was the ecu.

i have a spare ecu which i have tried but it does the same thing. The ecu was untested so could be dead for all i know.

I have a friend coming round later with his P38 so i can try his ecu and he can try mine.

I had problems with mine for ages and only fixed it when I painstakingly went through every wire and connection inside and under the car to check for tightness and damage. I traced the fault to one earth wire in the wiring connector block into the transfer ECU which had worked loose over time. Once this was pushed back in everything worked fine. Time consuming but worth it; I was ready to start buying new ECU's, motors and the like for such a simple problem.