aston Martin DB9 DSC problem

[Gin Man]

The DSC on my 2005 comes in too early, I only have to be doing 50mph and try to accelerate and the dsc lamp flashes and won't speed up, switching it off works, but lose the use of the instrument read out. Any ideas?

[Fullmel]

Make sure you have the correct size tyres fitted.
Can't see them not being but just a thought.

Front 235/40/19
Rear 275/35/19

[Gin Man]

The tyre sizes are correct.

[8Tech]

Read the codes to see if there are any showing a wheel speed sensor fault.