General: DEM Repairs

[Gazdok]

My AWD worked when there was no warning light or message.
I have never checked the AWD when the triangle was on or the Anti Skid message came up.
I checked my sunroof and bulk head drains. They are all free.

I checked the Volvo receipt.
It said: code indicating intermittent faults with
1) DEM oil pressure faulty valve
and
2) Communication fault between BCM - Brake Control Control Module.

This lead Volvo to recommend to replace either the lead to the DEM or the DEM altogather if the lead did not sort the problem.

So really guinea pig style repair where I am paying.

[gshadow325]

Originally Posted by Gazdok

My AWD worked when there was no warning light or message.
I have never checked the AWD when the triangle was on or the Anti Skid message came up.
I checked my sunroof and bulk head drains. They are all free.

I checked the Volvo receipt.
It said: code indicating intermittent faults with
1) DEM oil pressure faulty valve
and
2) Communication fault between BCM - Brake Control Control Module.

This lead Volvo to recommend to replace either the lead to the DEM or the DEM altogather if the lead did not sort the problem.

So really guinea pig style repair where I am paying.

oil pressure means a bad pressure switch, common in our cars. the style of repair is, you authorize me to guesstimate the repair on your car and you pay me because i am the so called expert LOL.

[Gazdok]

Hi gshadow325,

That sounds just like Volvo seem to be approaching repair jobs.

[andymuggwump]

Originally Posted by gshadow325

Haldex switch part # 30651694 List USD$115 Cost $92
Filter part # 30787687 List USD $18 cost $14.40
FLuid part # 1161641 List USD $21 cost $16.80

I did it on my back with my XC90 on ramps under the rear two wheels. took me 1hr MAXIMUM. That was taking my time too. That was getting out and looking up where the haldex fill plug was too! That was spilling some fluid out too all over the car. That was cleaing off the gunk from the side of the AOC for 15 minutes. Align the sensor is another load of crap.

My advice, do the sensor and order the fluid. change it. then scan the car again and report back.

btw- the fluid comes in a calk tube and one tube will have extra. just squeeze it all in till it spills out.

Did you change the filter too? I want to do this on mine but I read on another post on here that you need to drop the prop and remove the exhaust to do it? If not, how dificult is it to get at the filter and also where is the fill plug for the haldex?

[gshadow325]

Originally Posted by andymuggwump

Did you change the filter too? I want to do this on mine but I read on another post on here that you need to drop the prop and remove the exhaust to do it? If not, how dificult is it to get at the filter and also where is the fill plug for the haldex?

it was out of stock when i went to do it. so idk how to change it out.

[loveableguy]

Hello Folks,
I am from State,just have 05 xc90 V8 with "Anti skid service required" massage on and Boston Village Volvo told me it's caused by pressure sensor,could be the pump or DEM. It's bizarre,I thought it has something to do with angle steering sensor(SAS),Brake control module(BCM) ABS sensor or even CEM....etc.
I have checked my YAW sensor under passenger seat and there is no water.

Obviously,the first they will replace sensor,next will be the pump and so forth...
It's going to cost me a fortune.(don't have extended warranty)

[RoyMacDonald]

The procedure is to clear the fault codes and see what comes back. I'd have said yaw sensor but I take it the codes are telling them something different.

The yaw sensor can be damaged by heavy impacts, although it will still look fine. Can be repaired by a specialist though.

[bigtree]

Had my XC90 in to Volvo today for a free safety check. i always find that if you sneak out of the showroom and into the workshop the technicians are usually really helpful, today was no exception and i obtained a print out of the fault codes on my vehicle. (cleared them too). I think the BCM faults are permanent but there is also a DEM fault code.

BCM-0050 Control module Faulty signal - DTC is found active.
BCM-0121 Yaw rate sensor Signal outside its permitted range - DTC is found active.
BCM-0139 Pre-pressure valve power brake booster Signal outside its permitted range DTC is found active.

DEM-OOOA Power supply voltage, DEM Faulty value - DTC is found not active

I have been reading posts on the forum about repairs but am just wondering if anyone can tell me where to start/ which is the most likely fault.

I had the anti skid service indicator come on once, but put it down to just having the discs and pads changed.

Any help would be appreciated, only had the car for two weeks, turning out to be a nightmare.

[bigtree]

Originally Posted by bigtree

Had my XC90 in to Volvo today for a free safety check. i always find that if you sneak out of the showroom and into the workshop the technicians are usually really helpful, today was no exception and i obtained a print out of the fault codes on my vehicle. (cleared them too). I think the BCM faults are permanent but there is also a DEM fault code.

BCM-0050 Control module Faulty signal - DTC is found active.
BCM-0121 Yaw rate sensor Signal outside its permitted range - DTC is found active.
BCM-0139 Pre-pressure valve power brake booster Signal outside its permitted range DTC is found active.

DEM-000A Power supply voltage, DEM Faulty value - DTC is found not active

I have been reading posts on the forum about repairs but am just wondering if anyone can tell me where to start/ which is the most likely fault.

I had the anti skid service indicator come on once, but put it down to just having the discs and pads changed.

Any help would be appreciated, only had the car for two weeks, turning out to be a nightmare.

Thought i'd follow up on my last post, after having the codes reset last week i took the car back to volvo, after having the anti-skid service required appear again once. Only the yaw sensor code (BCM-0121 Yaw rate sensor Signal outside its permitted range - DTC is found active was present).

I had the 4 wheels aligned and the brakes control module calibrated on VIDA.

This removed the remaining brake code, however, i suspect that only time will tell if the problem comes back.

When i saw the original codes I was convinced that i needed a new brake control module, but now, after only minimal work, i suspect that it is actually alright. Sometimes simple fixes work, although i will probably eat my words knowing my luck!

[IDH]

Hi Forum,

I too have a faulty DEM and would like to pursue the BBA company to either repair or provide a re-conditioned DEM part. Can anyone advise me of the DEM Part number?

cheers
Ian