That's brilliant info swoop. Thankyou

Just one thing if may say. The truck used to do this often when about 2 or three times a day. It would suddenly just stop and the alarm mod 05 would come on and it would do it every time you are turning the truck. It would never cut out if you driving in straight lines. But if you switch it on and off it would just reset and carry on working.

However now the fault code comes up with VMN low next to it. And it won't reset itself when you switch it on and off and the forklift is stuck in the middle of the aisle with the forks 15ft in the air

Does this info help you to determine which diagnosis I should try first.