Use VID disable causes limp mode BA Falcon Ute

[devojet]

Hi I have a BA Falcon Ute non abs model. It has been converted to AWD using 4speed Territory running gear. As it was a non ABS model we have added a custom Hall Type speed sensor to the output shaft with 4 pulses per revolution. The speed sensor and gearbox work fine with the factory tune but the speedo is incorrect due to the diff ratio and tire size change. When I set "Use VID" to disable so I can change the diff ratio etc the car goes into limp mode (gear box locked in third) and shows a P0500 code. When I enable Use VID it works fine again but speedo is incorrect.

Thanks,
Daniel.

[devojet]

I worked it out. The stock tune had TCS selected for the speed input. I changed it to OSS and now it works fine.