V70 AWD Transmission: Sounds Expensive

[100K+]

My V70 AWD R has developed a fault. It started by throwing an anti skid service required warning approx. 10 mile from home. Part of the journey involved doing a 5 point turn in a back street. I could not swear to it but the car felt as if it was mechanically being braked more of a drag perhaps, as the car would free wheel but not as it should. Then out of the blue there were two separate "bangs" as if the car had jumped out of gear which it had not, from somewhere at the front near side. My immediate reaction was panic and I switched the engine off. On restarting the car completed the journey home fine.
DICE/VIDA reported DEM000B Oil pressure DEM faulty Value as the only relevant DTC I read and cleared it and this time DICE?VIDA reported DEM0005 Regulator valve faulty signal, DEM 000B did not return.

Today, after checking the tightness of the two front hub bolt (both fine) I took the car out to a car park and on full lock either way there was noise which I'd say was a cross between tyre rub and the vibration noise you get from the aluminium heat shield above the exhaust when it comes loose - which mine ain't. It appeared to come from just over my left shoulder/ centre of the back seat area. The was also a pair of "jump out of gear bangs"
Also the drag was again apparent.

I'm going to start by checking the oil in the Haldex, I did change it about 2 year ago, but where I go from there I'll take suggestions.
Sounds like a dealer job....


Cheers

Bob

[tdi]

Sounds very much like angle gear has failed. Have a good look underneath. The sound and area you describe point towards it.I hope it's not .

[4candles]

Is a 2004 XC the same system or different?

Hopefully its easily sortable whatever it is 100+....

[100K+]

Originally Posted by tdi

Sounds very much like angle gear has failed. Have a good look underneath. The sound and area you describe point towards it.I hope it's not .

Oh You joy bringer!!! All I want for Christmas is an Angle Gear (+fitting)

Been out again and checked the Haldex oil level and all appears to fine, no sign of leaks and the level is fine. Will check out the front this afternoon.
Angle gear failure does sound like a possibility- the jumping out of gear noise deffo could be that. - its a heavy knock/bang, but why only on the turn is a puzzle. Angle gear was only changed at 48K too (now 97K)

IIRC damaged Bevel gear don't throw DTC'S but they do rumble before failure, and mines been "normal" which is why I do/did not suspect it, unless a tooth a smashed off?????

What the other rubbing/scraping noise is, is a mystery.. It sound like the prop shaft is rubbing somehow, but again only on full lock....


Cheers

Bob

[tdi]

Yes it the same . Later models had later haldex with stronger parts and precharged pumps but basically the same. It's the same awd system used on vw and audis.

[100K+]

[QUOTE=4candles;2027971]Is a 2004 XC the same system or different?

]

I'm betting they are similar if not the same although VIDA does show only the AWD R info not the XC 70 too for certain bits of the AWD system. Perhaps cos even though its a 2004 model its a 6 speed box not 5 ( or is the XC 70 6 speed too on a 2004)

Cheers

Bob

[100K+]

I really must learn to type with more than one finger.......

Bob

[tdi]

Originally Posted by 100K+

Oh You joy bringer!!! All I want for Christmas is an Angle Gear (+fitting)

Been out again and checked the Haldex oil level and all appears to fine, no sign of leaks and the level is fine. Will check out the front this afternoon.
Angle gear failure does sound like a possibility- the jumping out of gear noise deffo could be that. - its a heavy knock/bang, but why only on the turn is a puzzle. Angle gear was only changed at 48K too (now 97K)

IIRC damaged Bevel gear don't throw DTC'S but they do rumble before failure, and mines been "normal" which is why I do/did not suspect it, unless a tooth a smashed off?????

What the other rubbing/scraping noise is, is a mystery.. It sound like the prop shaft is rubbing somehow, but again only on full lock....


Cheers

Bob

Your correct they won't throw codes as it's a mechanical set up there . The electronic part is the haldex unit. Strange it has thrown a code but the banging sounds like angle gear. Strange as it's only covered low miles. Have you checked the drive shaft bolts ?

[4candles]

[QUOTE=100K+;2027982]

Originally Posted by 4candles

Is a 2004 XC the same system or different?

]

I'm betting they are similar if not the same although VIDA does show only the AWD R info not the XC 70 too for certain bits of the AWD system. Perhaps cos even though its a 2004 model its a 6 speed box not 5 ( or is the XC 70 6 speed too on a 2004)

Cheers

Bob

Its 5 speed auto.

[100K+]

Originally Posted by tdi

Your correct they won't throw codes as it's a mechanical set up there . The electronic part is the haldex unit. Strange it has thrown a code but the banging sounds like angle gear. Strange as it's only covered low miles. Have you checked the drive shaft bolts ?

Yep checked drive shaft bolts 1st thing this AM, upset that they weren't hanging off - would have been a simple fix lol.

Been back under the front this pm, and bevel gear unit is sound, nice and dry, and correctly filled with oil,but I did notice a weep from my turbo
Sounds and sensations are strange, but the banging/impact of gears I would say was gears being Forced to Mesh rather than coming out of mesh, and there is deffo a drag/brake when trying to free wheel in full lock manouvers.
Read abit about this too this pm, and that's one way VIDA says the AWD can be checked. (free wheel at approx. 5mph in a tight circle then again at a greater speed. Because the AWD system has kicked in the car slows quicker..????) - double dutch if you as me.

Unless someone has suggestion, I think this will have to be punted to the local dealer. What puzzles me like TDI is, has the DTC has caused a mechanical issue or is it just coincidence and the fixing of the DTC would still leave the mechanical problem to be sorted.??

Cheers

Bob.