The NAG won't talk to the computer

I have just had a call from the garage, my p38 the NAG won't communicate with the PC hence can't fault check . Any ideas why this would happen?

Cheers

JTS

Get them to check diagnostic connector for corrosion and also ask what kit th!ey are using

T4 land rover factory machine is what he is using, could there be blown fuse?

Jonnnythreesheds said:

T4 land rover factory machine is what he is using, could there be blown fuse?

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Maybe fuse 35.

Wires corroded of the back of the OBD connector, corroded wire splices.

Turned out to be bent pins in the plug. But thanks to your combined imput, the fitter now thinks I know a lot more than I do, which might have it's advantages down the road.

Jonnnythreesheds said:

Turned out to be bent pins in the plug. But thanks to your combined imput, the fitter now thinks I know a lot more than I do, which might have it's advantages down the road.

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LZ has advantage of combined Knowledge

Jonnnythreesheds said:

Turned out to be bent pins in the plug. But thanks to your combined imput, the fitter now thinks I know a lot more than I do, which might have it's advantages down the road.

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Doesn't give you a lot of confidence in the fitter (garage). he should have found that out straight away. Lack of communication with any ECU using TestBook (and any other diagnostic machine) can be caused by:
a) Low Battery
b) Corrosion of pins in the diagnostic connector, most lost their covers ages ago and can have mud etc on them.
c) In the door frame (A pillar) on both sides of the car there are white connectors that can and do corrode badly, especially the passenger side when you want to communicate with the EAS. Best solution, not easy but doable is to wire out these connector blocks. Do one wire at a time so you don't get them muddled.
d) Some num-head that can't operate or understand how T4 TestBook works.