Adblue Wiring loom

[Aspencer76]

Hi I have a 2018 volvo v90 D4, and I have wiring loom fault Volvo have told me I need complete car wiring loom which cost £6,000 is this true we have tried to get a wiring diagram but can't get hold of one, wish I could delete adblue out but apparently impossible on my V90 can anyone advise

[GrahamBrown1]

This sounds awfully like we can’t find the fault so it needs a loom. Wiring looms can be repaired and fault traced. Even if you narrow down which bad wires are in the loom you could run new ones to make repair easier and more cost effective. There is obviously a labour cost in tracing wiring faults and sometimes some disassembly but there is in fitting a new loom.

I would try and find a specialised garage who repair these sorts of faults. There are good people out there, they don’t have to be volvo technicians. Have a Google of simply diagnostics. This guy knows his stuff. If you can find a garage that’s a member of his network you stand a good chance at a repair less than £6000!

It would be extremely hard to take this on as a do it yourself without the correct information and diagrams but they should be available to the aftermarket by now.

[wynnj]

Obviously can't judge your situation as don't have enough information but I'd be very sceptical if it was my car.
I can relate a similar issue a friend of mine had with a citroen in France. He bought a relatively new car from a citroen main dealer which came with a guarantee. After a few months of ownership the orange check engine light came on and he took it back to them. Plugged into their diagnostics they diagnosed the problem, replaced a component and sent him on his way. You've guessed it, next day check engine light on again and this time I went with him to try and understand the problem more fully. This time they said it needed a complete new main wiring harness at a cost of several thousands euros (paid by the guarantee insurance) but wouln't explain why, or what they'd found, and the technician disappeared as fast as possible when questioned. Took weeks for new harness to be ordered and fitted, and, you've guessed it, a few days after getting his car back the check engine light was on again. He eventually got them to replace the car.
With the correct understanding and diagnostic equipment I would expect a qualified volvo dealer to be able to say much more precisely where the fault lay, and in my opinion is far more likely to be a faulty sensor or one of the myriad connectors on the car. If they can't get closer to the root of the problem I'd have even less confidence that they'd be able to rebuild the car after stripping it down to get the original wiring loom out. The problem these days is finding someone who understands how a car works, can read a wiring diagram and is capable of more than plug and play at the customers expense.

[h00ligann1]

Originally Posted by Aspencer76

Hi I have a 2018 volvo v90 D4, and I have wiring loom fault Volvo have told me I need complete car wiring loom which cost £6,000 is this true we have tried to get a wiring diagram but can't get hold of one, wish I could delete adblue out but apparently impossible on my V90 can anyone advise

Hi, are you sure it's not possible to just disable it instead of fixing it? For sure, it would be much cheaper, and the car can run perfectly fine with it disabled, plus nothing has to be removed; in most cars, it's just a flashing ecu.*