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Brake Assist Service Needed and Anti-Skid ABS Service Needed Warnings Intermittent

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Brake Assist Service Needed and Anti-Skid ABS Service Needed Warnings Intermittent

  #1  
Old 07-06-2014, 11:35 AM
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Default Brake Assist Service Needed and Anti-Skid ABS Service Needed Warnings Intermittent

Hi All:

I am new owner of a 2004 XC90 2.5T. The guy I bought it from is a colleague and took great care of it. I have had it for almost a month and really enjoy the vehicle and have started to do the regular maintenance on it like oil changes.

I have been the primary driver throughout the past four weeks. Just last night my wife drove it for the first time to the hospital in taking my daughter in to get checked up. Our other car was in the shop, so she took the XC90.

This morning when I started the car, I got the following warning messages and lights.

Brake Assist Service Needed
Anti-Skid / ABS Service Needed

When the car first started out it said that the Anti-Skid was temporarily disabled. Then the warning light came on and the above message showed up.

I got to work and turned of the car. At lunch I got my colleague who sold it to me and he saw the message. He drove it around our office's parking lot and the light went away. Then an hour later I took it out for a bit and about 2 minutes into driving it the messages came back. 10 minutes later, they were gone . I wasn't driving any differently.

I drove it home and the messages have not come back since.

What on earth can cause these messages to come on and go away automatically without any rhyme or reason. Should I be concerned?
 
  #2  
Old 07-07-2014, 05:32 AM
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I think Steering Angle Sensor.
 
  #3  
Old 07-07-2014, 01:54 PM
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if you search for the anti skid warning you will see many, many posts about possible causes.
 
  #4  
Old 07-17-2014, 03:38 AM
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Well, I finally got the message scanned when it came up (as it comes and goes often). Turns out to be the Rear Right ABS sensor. That is being changed later today.
 
  #5  
Old 07-27-2014, 01:01 PM
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Arrgh...well, after the rear right ABS sensor was changed, a week goes by without messages...

Yesterday, the dreaded "Anti-Skid Service" and "Brake Assist Service" came on again! And it comes and goes (turns off and comes back on)

I think the worst part of this is that right before the message comes on, the ABS system kicks in at weird times...so even when slowly stopping at a light or a stop sign, the ABS pulsing would come on at like 5-10km/a hour while stopping on an even surface. I almost prefer if there is actually a way to shut off the ABS permanently since I have drive a car without it for 12 years.

Guess I'll have to wait till the message comes back and then bring it back to the shop with the hope that the message will be there when I show up. I would be shocked if it is that sensor again since it was just replaced 1-2 weeks ago.
 
  #6  
Old 08-01-2014, 11:23 PM
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This is where it is paramount that error codes be scanned with a DICE/VIDA rather than your run of the mill OBDII scanner or some other after market code scanner.

It turns out that I changed that ABS sensor for nothing. Turns out that according to DICE/VIDA, it is the wheel bearing / wheel hub that is causing that ABS code (it said that it was a mechanical failure). My regular garage's scanner just said rear/right ABS sensor error. After the wheel hub was changed out, errors have stopped and the Volvo mechanic said that I had the ABS sensor changed when it wasn't the problem. Live and learn...
 
  #7  
Old 08-02-2014, 09:00 AM
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While VIDA does provide more accurate fault codes than a generic OBDII scanner, it wouldn't have mattered much here. This comes down to the mechanic and his experience. A lot of people think that just because a code is set for a sensor (any sensor, not just wheel speed sensors), then that sensor needs to be replaced. Crappy mechanics like to just throw parts at the car rather than actually diagnose the fault code properly. The various modules monitor various sensors. If they see a reading that is out of range, it will set a fault code for that sensor. The mechanic has to figure out why it is out of range. For example, if a car is running lean because of a vacuum leak, it will set a code for an oxygen sensor. A crappy mechanic will throw a new oxygen sensor in and clear it. Well, the vacuum leak is still there so after some driving, the same code will come back.

I hate to say it, but you probably replaced the hub for no reason as well, unless the one you had on there was a cheap aftermarket one. The sensor reads a tone ring in the hub. The tone ring is internal, so it is pretty well protected. It doesn't usually just go bad. A lot of times, debris will stick to the back of the hub and/or the sensor. This causes the speed sensor reading to be incorrect, thus setting a code. A simple cleaning with some compressed air takes care of it. I've seen it many times. Either way, it's fixed now so not much else you can do.
 
  #8  
Old 01-13-2017, 10:33 PM
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Hi guys, This is closest to my problem, I found this sitting behind my tire. I don't know if they are part of my problem, or what. See pics

background-I have the two messages, as displayed above. Then while driving to the closest gas station, I looked behind the wheel because the grinding noise/sensation that appears to come from the right rear of this XC90 05 2.5t.

These rings seem to fit each other. one looks more beaten up than the other.

Also any advise, ie Don't drive, or you should be fine... would be nice. or check the fluid

Added-- the pictured rings, were the outside of the bearing, covering the bearings.
 
Attached Thumbnails Brake Assist Service Needed and Anti-Skid ABS Service Needed Warnings Intermittent-0113172137.jpg  

Last edited by arfstrom; 01-17-2017 at 04:25 PM. Reason: identified the rings
  #9  
Old 01-16-2017, 12:10 PM
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Okay, The advise should have been don't drive. ended up being a blown wheel bearing, and in the process it took out the speed sensor. Roughly $1300. at a shop. The shop is working with me, with a $100. coupon, and such! Thank you Matt! If I had tools, and time, and everything else, $75 for speed sensor, 300 for bearing. (I had not verified any of those quoted) sounds like a PIA.
 
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