XC70 Gearbox issue

[LikesToFly]

Hi guys, I recently took my 09 XC70 D5 for a 136k service and thought I'd get the transmission oil changed at the same time. Having collected the car, the engine is now intermittently over-revving on upshifts and once or twice has had a really rough downshift.

The over-revving is similar to if, in a manual car, you kept your foot on the accelerator whilst you depress the clutch and change gear. the engine over-revs, whilst the transmission shifts up.

on the down shift, it's as if you depressed the clutch in a manual car, changed gear and immediately just took your foot off the clutch as fast as you could, caused a hard jolt as the car decelerates.

The software was updated during the service.

The problem is intermittent and as of yet, I cant pinpoint the exact parameters when the issue is happening.mostly happens on the way from second to third and third to fourth.

Any body any ideas? I know the correct oil is a must. The work was carried out by a Volvo dealer. Most likely a software issue? The gearbox was faultless before the service and I'd like an idea what the problem is, before I try to prove that it was the dealer's input that has raised the fault.

Thanks in advance

[I-S]

It's likely that it hasn't been properly run through the re-learn procedure - or possibly even the oil data wasn't reset when it was serviced.

[LikesToFly]

Thanks for the reply I-S. I'm hoping it's going to be something relatively simple, although having spoken to the technician this morning by phone, I get the impression that he's already trying to fend off any suggestion that they haven't done the work properly. He said that the car shouldn't need a "TCM Adaption" if only the oil has been changed, yet also suggested that any gearbox issue would've been picked up on the test drive the car had.
I'll check the invoice today and see exactly what work it states was carried out. Of interest, how long does the TCM Adaption process take? That might give me a clue, as I can look at labour times charged to see if they may have done it.

[PEGE63]

Originally Posted by I-S

It's likely that it hasn't been properly run through the re-learn procedure - or possibly even the oil data wasn't reset when it was serviced.

Looking fwd to hear the outcome of this as I'm thinking to have this done too....

[LikesToFly]

It's going in Wednesday. Hoping that it happens whilst the technician is driving. Hate it when you have an intermittent problem that disappears when the dealer take the car- the age old engineer-proximity switch!

[MindlessJD]

Originally Posted by LikesToFly

Hi guys, I recently took my 09 XC70 D5 for a 136k service and thought I'd get the transmission oil changed at the same time. Having collected the car, the engine is now intermittently over-revving on upshifts and once or twice has had a really rough downshift.

The over-revving is similar to if, in a manual car, you kept your foot on the accelerator whilst you depress the clutch and change gear. the engine over-revs, whilst the transmission shifts up.

on the down shift, it's as if you depressed the clutch in a manual car, changed gear and immediately just took your foot off the clutch as fast as you could, caused a hard jolt as the car decelerates.

The software was updated during the service.

The problem is intermittent and as of yet, I cant pinpoint the exact parameters when the issue is happening.mostly happens on the way from second to third and third to fourth.

Any body any ideas? I know the correct oil is a must. The work was carried out by a Volvo dealer. Most likely a software issue? The gearbox was faultless before the service and I'd like an idea what the problem is, before I try to prove that it was the dealer's input that has raised the fault.

Thanks in advance

This is really interesting, I had the software updated on my car to try and fix a different gearbox issue and mine is experiencing these symptoms too now. I've definitely noticed strange upshifts and rough downshifts.

I've noticed this in addition to my original problem which is where the whole car will jolt and a clunk can be heard when selecting drive, this again only happens intermittently though and only when selecting drive.

I've only had the car about a month or so and it's had the issue selecting drive since I've had it, it is booked in to the garage for the 1st September to be looked at again (all under warranty thankfully).

So far, over two sessions;
1) Reset the adaptations
2) Reset the adaptations and changed the fluid

Car has only done 42,000 miles.

[LikesToFly]

So the car went in today. I spent about two or three hours driving around with the technician, resetting the TCM Adaptations to try to alleviate the problem. It still remains. The car is "flare shifting" when shifting up from 2-3 and 3-4, whilst under load, ie heavy acceleration up hill.

The issue was non existent until I collected the car after having the transmission oil replaced and a service carried out.
The technician thought that it was too much of a coincidence that the symptoms only appeared after the oil change. The adaptation process didn't work. VIDA states that it should be done at 1400, 1800 and 2500rpm. We did all of those as well as a higher revs run at 3500 as it recommends if "sporty" driving is taking place.

He was none the wiser having done this, so sent a technical report to Volvo UK.

Just heard back from the workshop- apparently it's gearbox wear and tear. They recommend a new transmission unsurprisingly. The Volvo UK technical specialist said he'd looked on Pi (?) and when he took into account the cars 136k mileage, he said it was down to wear and tear.

When asked why it appeared just after they changed the oil, the explanation was "the sludge and contaminants in the oil will have been disguising the problem, but now it has new clean oil in it, the problem has become apparent"

Time for questions:

If there was an airlock in the transmission when the system was refilled and there is now slightly less oil than there should be, would that cause the symptoms?
What component in particular is likely to be worn, giving these symptoms?
Are there any companies that will refurb the transmission, guessing that Volvo will charge a few thousand for a new box?

[I-S]

That doesn't sound acceptable...

One query I would have is what fluid have they used?

Around 2010, volvo changed from JWS3309 equivalent (volvo 97340) to AW-1 equivalent (volvo 97342) (low viscosity) fluid.

I would, in your position, want to be absolutely clear a) which oil should be used and b) which oil was used.

Although the gearbox can technically operate with either fluid, I'm sure it needs to be supported by the correct software - which the earlier cars may well lack for the later fluid. Whether subsequent software updates would allow an earlier car to operate with the later fluid, I do not know.

Just a thought, and worth a check.

[LikesToFly]

The dealer mentioned it having been upgraded with the most up-to-date software which was the 2010 release.

The oil was "U01161640 TRANSMISSION OIL QTY 2 @ £49.80ea

Think maybe the update to the 2010 software might have something to do with it? Especially if the car has been filled with the "correct" spec for my car, ie JWS3309 equiv.

I'll get on to them in the morning and see what oil it was that they used. After that, I may see if they can re-instate the old 2009 software and see if that works..

It could well be that the gearbox is knackered, given the mileage, but it seems an almighty coincidence that the symptoms happened after the oil change.

Their explanation of why it shows up with new oil, compared to old, sounds like crap...

[LikesToFly]

Anybody know any Transmission rebuilders?