Edit: Moved to different thread as its a different problem and Fork doesn't have error code display panel.
Finally found the problem, it was a broken wire in the harness that runs across the top of gear box left to Right. Thanks again techno nz for all your help.
Cheers
Kombi
Do you get drive if you connect pos & neg directly to either the fwd or reverse solenoid on the top of the transmission with the engine running?
Thanks Techno NZ we tried all of the possible causes you mentioned and even replaced the OSS but unfortunately still the same :(
any more ideas you may have we would be grateful for.
Many Thanks
Thank You Techno NZ we will give it a shot :)
The fault codes on this truck have nothing to do with the transmission, as long as the engine is running it should drive. Run 12v pos & neg from the battery straight to one of the trans solenoids (unplug first), see if you have drive, if so the trans is fine.
Swap out the headlight relay for the creep speed relay on the relay bank under the bonnet. Creep speed relay (incorrectly named but what can you do) is part of the park brake circuit. Could also be feed to the fwd/rev lever assy or a faulty OSS under the dash by accelerator pedal.