Boost pressure control valve

[GMcL]

I appear to have a problem with the boost pressure control valve on my 8 year old S60.

It's the first time in having 8 turbo petrol and diesel cars since the mid-90's I've had to replace such a part. It appears to be considered a service part reading other entries here and other places which needs replacing around the 100k miles mark. My car has 74k.

I'm reluctant to go with Volvo given this part is now failing where on previous cars it did not and my car does not appear to be an isolated case.

Question: What have people replaced with ?
Have you stuck with OEM or switched ? I have no idea what the Scandix replacement part is though Pierburg, Metzger, MEAT & DORIA, VEMO and SIDAT all make the component available through online parts shops (not the Bay of e)

Your thoughts, experiences, views ?

[DT19]

I may be having a similar issue with my car but the codes are vague although one of them mentions turbo boost under pressure and so the control valve is suspect. I wasn't aware there was a high failure rate with them.

Mine is the 4 pot T5 engine, what engine do you have?

[GMcL]

My car has the D5204T2 two litre D3 engine.

I don't get any codes or warnings. The turbo just does not boost.

If I disconnect the electrics and reseat the connector it's usually fine for a few weeks or even months, I don't do a huge annual mileage in this car. I also reconnected the pipe work which I thought had solved the problem but it does return from time to time.

[andyg]

Hi there. Turbo boost control govenors do seem to begin to fail from about 5 years on. I have had a couple go over the years on the various cars I have owned. Most recently on my 2013 S80 that has the exact same engine as yours. It was replaced at 6 years / 62k miles by a local indie garage. The part was £148 and labour £43 (ex VAT), but that included time hooking up to VIDA diagnostics and fault finding to isolate the exact problem, plus clearing a yellow warning light on the dash. I guess you could save cash by DIY because the governor is an easy part to source and replace. But a garage with the proper diagnostics can probably do a better job? There are other reasons why the turbo boost may not be working correctly and they should be able to determine what exactly is wrong.

[DT19]

My car has been in the Volvo dealers all week and they've diagnosed a knackered ECU and offered to change it for £1506. So far I've declined their kind offer. It started with no boost caused by a stuck open turbo wastgate, that then turned into a turbo control valve not operating which then traced back to a corrupted signal coming from the ECU pin that controls the turbo control valve. So, the ECU is getting posted to a specialist repairers tomorrow who reckon they can do it for £250ish and I like that much better so fingers crossed.

[GMcL]

Thank you both for your posts.
I have not done anything with my car yet, as I mentioned in the original post it's not a car I drive often these days.
I would be grateful DT19 if you could post any feedback regarding your ECU and what they say was the issue and whether or not it fixes your boost problem or if you still need the boost control valve also.

[GMcL]

So, the new turbo boost control valve/solenoid arrived this morning.
Two T25 headed screws hold the valve in place, backed the bottom one off a couple of turns and took the top one out, swapped over the two pipes and the electric switch, done.

Wow! What a difference. The car, while it boosted before, was not giving the full benefit of the remap. The car takes off and flies now. I really am quite surprised at how much extra, instant boost is now available. Funny how you don't notice when these things creep up on you. I've had the car for over 5 years now covered 50,000 miles in it and it's like driving a new car over again in terms of performance.

I went with a Pierburg replacement part from AutoDoc, with one cent change from 120€. The original part has both the Volvo and a Pierburg number. Pierburg must be the OE part.

For reference Engine code D5204T2 5 cylinder D3 original part:
Volvo part # 31293964
Pierburg # 7.02325.02

Replacement part # 7.02325.05.0