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      07-15-2013, 11:17 AM   #1
Jamese30
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DSC Failure?

Hi All,
I donít know if you can help (I have also posted on another forum - apologies if you are reading twice!). Unfortunately as of this morning I have become another victim of BMWs now renowned DSC failure (having owned 9 BMWs is it me or are new BMWs becoming more unreliable!!?? Ė I never had these kind of problems with my E30s, E34 and E36!!).

Upon starting this morning my E92 320d came up with the following display on the kombi.




(Note on this image without the handbrake on the handbrake symbol remains amber not red)

So the question is: -

Do I need to get this put on the diagnostics?

Or will the module repair kit with the following part number resolve the issue?

B34.51.6.797.896.646 costing £144+vat

I assume, from what I have read, once fitted I will need to re-bleed the brakes and then re-programme the ABS unit.

Hope someone can help,



Best regards
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      07-15-2013, 02:07 PM   #2
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No point even speculating without a diagnostic. That could end up being an abs sensor or something reasonably trivial.
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      07-15-2013, 02:16 PM   #3
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The first step is to have the codes read by a diagnostic machine. There are many causes of this fault including wheel speed sensors, steering wheel angle sensor and of course the famous Continental ATE ABS/DSC Hydro unit failure - either the mechanical (pump) or electronic (module) elements of this unit.

In my case it was the DSC/ABS pump. I sent the whole unit to ECU Testing near Derby. They were great. Don't send it to BBA Reman - they were hopeless.

I'm not saying you have the same problem as me but my post may be of interest to you. One consolation for you is that the ABS/DSC unit for the 4 cylinder engines is less costly than for the 6 cylinder units - should a repair not be effective.

See http://www.e90post.com/forums/showthread.php?t=813999
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      07-15-2013, 02:43 PM   #4
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Thanks - I will read over that.

What is the best software to get to read error codes? I found the ebay links sadly no longer worked?
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      07-15-2013, 03:32 PM   #5
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You will need a USB/OBD cable and a minimum of INPA to read the codes.
You can find these on ebay and BMCables have a good reputation for providing an excellent s/w and cable package. My car is Feb 2007 build and my setup works for my car however the cable spec changed for cars after March 2007.
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      07-15-2013, 04:25 PM   #6
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Looks like a hydro unit issue (annoyingly common on 1 & 3 series 4 cylinder vehicles, but is also starting to rear it's head on the 6 cylinder cars) getting an Indy to check it out or someone with some coding software described elsewhere as a second line of defence if you want to do it yourself or get a forum member with the right software/hardware is the way to go to ultimately verify the problem.

The hydro unit or the 4cylinder units isn't too pricy around £170 odd (£1580 odd plus VAT on 6 cylinder cars) the car will after fitting need a brake fluid change but the repair kit for someone in the know is a straightforward operation and should take around 2 hours plus some coding.
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      07-25-2013, 02:15 PM   #7
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Fault diagnosed as I suspected.... (Driving the car after the fault I established no ABS faults but dcs inoperative)

Code 5e20 hydraulic unit.

Repair cost £429(BMW CC discount on parts) fitted including new brake fluid and a check of the timing chain.

No goodwill gesture from BMW even after 15 years of BMW ownership and my mother having the same failure on her 120d!

Irony was 2 other cars diagnosed with the same failure whilst mine was in for its diagnosis!
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      07-25-2013, 02:19 PM   #8
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Tmarshall thanks for the pointer on sw and cables I will check that out!
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      08-04-2013, 08:27 AM   #9
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This has just happened to me, light has come on and after the issue with cracked wheels (x 5) and numerous coil pack changes I am afraid to say hat I have totally fallen out of love with my E93.

When the finance is paid in October it's going, and I am not even sure if I want another BMW, after 12 years of loyalty and 5 vehicles I just don't trust them anymore.
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      09-15-2013, 01:34 PM   #10
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I had a brake fluid change at independent bmw specialist in Bristol. Within 1 mile of driving ive had the DSC failure come on, no abs, no dsc, no hill assist, all have now fault. Bearing in mind its done 59,000 miles and has happened within a mile of brake fluid change, is the garage at fault? Also they are refusing to accept fault, so what is my next option against them? Cheers
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      09-15-2013, 01:58 PM   #11
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I doubt you could prove a link. The DSC units can go at any time.
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      09-15-2013, 02:37 PM   #12
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The DSC units on these cars can as tmarshalls stated let go it would seem without warning. It would be very difficult to prove a link re the work you've had carried and the DSC light as abrasive fluid change really is a straightforward operation to carry out.

Sadly though, new brake fluid can trigger a reaction in the unit they seem that delicate but its also worth noting especially with the 6 cylinder units that the DSC software updates available can cause problems and there's a real reluctance to carry out the update. The 4 cylinder repair units anywhere between £140odd and £168 +VAT which isn't so bad, while the 6 cylinder units are a good £1700 + VAT or a refurb if its possible by someone like ECU Testing) which is why the procedure if the updates there in many people's opinion is risky to do(we go as far as to per warn upfront the implications of the update)

Last edited by old grey steve; 09-15-2013 at 02:50 PM.
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      09-28-2013, 01:05 PM   #13
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have any of you seen this???

http://www.e90post.com/forums/showth...light=abs+pump
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      09-29-2013, 01:52 AM   #14
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Quote:
Originally Posted by q_jonblaze View Post

Ave. Exactly same shit happens to me on autobahn. On that day was raining, so I have to use a slowest lane, no traction, no abs at all. I read that link above and have repaired my dsc unit myself. Only the abs bleeding make a problem, solved with dis.

Last edited by litany; 09-29-2013 at 03:48 AM.
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      09-29-2013, 11:56 AM   #15
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I recently had the abs/dtc/dsc/ and the dreaded red cog too!, cleaned the abs speed sensors last weekend and they have all stopped popping up, lights came up again once since but for the last 150 miles nothing at all, which makes me think its a dodgy abs sensor.
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      09-30-2013, 04:10 AM   #16
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Quote:
Originally Posted by oldbilly View Post
I recently had the abs/dtc/dsc/ and the dreaded red cog too!, cleaned the abs speed sensors last weekend and they have all stopped popping up, lights came up again once since but for the last 150 miles nothing at all, which makes me think its a dodgy abs sensor.
Hi, what type of code error You have?
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      09-30-2013, 01:22 PM   #17
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Originally Posted by litany View Post
Hi, what type of code error You have?
18 codes? 4co3/438d/4660/49f2/3f62/transmission 5014/51ad/93d1
d356/d355/d354/5df7 wiring support voltage 18volts/d35b pt-can acc1 brake data missing/d372 f can swa-top sensor data missing
steering lock a6d1/a6cf/c910 junction box electrics.

I had lights everyday about 2 miles after 1st start up and cleared the codes about 4 times, from my experience with codes many are activated and are related to the condition but are not the actual fault, one was the abs speed sensor which came up more then once, its a very easy task to give them a good clean and the lights stopped popping up, but they have reappeared again twice in the last 10 days since which to me points to one of the abs speed sensor signal.

Last edited by oldbilly; 09-30-2013 at 02:29 PM.
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      10-01-2013, 04:17 AM   #18
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Quote:
Originally Posted by oldbilly View Post
18 codes? 4co3/438d/4660/49f2/3f62/transmission 5014/51ad/93d1
d356/d355/d354/5df7 wiring support voltage 18volts/d35b pt-can acc1 brake data missing/d372 f can swa-top sensor data missing
steering lock a6d1/a6cf/c910 junction box electrics.

I had lights everyday about 2 miles after 1st start up and cleared the codes about 4 times, from my experience with codes many are activated and are related to the condition but are not the actual fault, one was the abs speed sensor which came up more then once, its a very easy task to give them a good clean and the lights stopped popping up, but they have reappeared again twice in the last 10 days since which to me points to one of the abs speed sensor signal.
You really looking for 5014 and 51AD. Thats different to my situation, so Your dsc unit should be fine. I will suggest to buy one new or any working sensor and check each separate wheel. Error 5014 which is a battery voltage (can make a mess on others errors), I'm sure You have to check this option as well.

Last edited by litany; 10-01-2013 at 05:20 AM.
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      10-01-2013, 02:43 PM   #19
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Quote:
Originally Posted by litany View Post
You really looking for 5014 and 51AD. Thats different to my situation, so Your dsc unit should be fine. I will suggest to buy one new or any working sensor and check each separate wheel. Error 5014 which is a battery voltage (can make a mess on others errors), I'm sure You have to check this option as well.
Thanks for the input, I have checked the battery oem bmw and it has a green light although I will need to check voltage figures when the engine is running, I also have a new speed sensor which I will be fitting at the weekend, will post up results.
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      10-02-2013, 08:21 AM   #20
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same thing happened to me mate, out of the blue on morning lights came on
had it diagnosed, code was 5e20 hydraulic unit pressure sensor, internal

looks like i will need a repair kit and my mate whose is a mechanic has quoted me 60 quid to fit the kit and bleed brakes including brake fluid.

does anyone know how much kit costs for e90 320d?
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      10-02-2013, 01:01 PM   #21
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Quote:
Originally Posted by bmwm-power View Post
same thing happened to me mate, out of the blue on morning lights came on
had it diagnosed, code was 5e20 hydraulic unit pressure sensor, internal

looks like i will need a repair kit and my mate whose is a mechanic has quoted me 60 quid to fit the kit and bleed brakes including brake fluid.

does anyone know how much kit costs for e90 320d?
Hi, what is Your number of dsc unit?
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      10-12-2013, 10:47 AM   #22
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Quote:
Originally Posted by oldbilly View Post
Thanks for the input, I have checked the battery oem bmw and it has a green light although I will need to check voltage figures when the engine is running, I also have a new speed sensor which I will be fitting at the weekend, will post up results.
another update, still having the error lights coming up, also the yellow battery light, went back and had the codes read resulting in the same number of codes including battery and junction box electrics so installed a new battery and on its 1st run today brought up the same errors!
when I returned home I checked the main cable into the junction/fuse box and looks ok, but a relay fitted next the power cable felt quite warm, I'm now wondering if the relay may be the problem?
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