[Old Wobbler]

I recently bought a 2nd hand Volvo XC60 for the wife. Its a 2011 model with the D5 2.4 215BHP model and an auto box. It's a high spec car with BLIS, front and rear sensors, cameras and interactive cruise control.
Car has a full Volvo service history and we are its 3 owner from new.

Car was fine for the first 4 weeks......well apart from the rear bushes needed changing and the alternator belt was badly worn. Out for a drive, I shoved my foot to the floor to get past something and the dash showed 'Transmission service required.' I arranged with the local Volvo dealer to get it in for the codes to be read.

Code was TCM-P074100. lock up Solenoid.

Garage suggested that the next step was to let them have the car for adaptions to be made via a computer.
This was agreed and done. Less than 1 mile after picking the car up the dash showed 'transmission service required.' Called the garage and they said 'these adaption's can take two or three goes to get them to fix the issue. Bring it back and we will read the codes.' Booked the car back in, they have the car and I'm rung with a new code.

TCM-D074100.

After chatting with the garage our new car needs a complete new gearbox control unit with solenoids and valves costing £1294 from volvo plus £300 of seals, gaskets and oil. Add in £400 of labour too that's close on £2,000 of work on the wifes 'New' car.

I call the garage that sold us the car as its under warranty, and they suggest that the car just needs a gearbox oil/filter change. They also wanted the car back. So I took them the car and they checked the codes. Brought me the car back and told me to take it home and they would chat with a gearbox specialist. They also stated that the code reader now shows:-

DTC not activated.

What the heck does that mean?

Has somebody switched the code reader off in the car so it wont show any faults?

So to add injury to insult the car has now started a clicking sound when I turn hard right on full lock. Sounds like the CV joint is failing and the drive shaft on the drivers side needs replacing.

Are these separate issues or is it possible they are linked?

So it looks like I'm left with a right lemon of a XC60 that looks the business but mechanically its not.

Does anybody now what the codes really mean? Can anybody shed some light on them for me.

Cheers.
OW