|
XC90 '02–'15 General Forum for the P2-platform XC90 model |
Information |
|
2009 D5 XC90 Loss of Power, Anti Skid and ABS PulsingViews : 304 Replies : 10Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Oct 26th, 2024, 21:06 | #1 |
New Member
Last Online: Nov 3rd, 2024 20:27
Join Date: Oct 2024
Location: Southampton
|
2009 D5 XC90 Loss of Power, Anti Skid and ABS Pulsing
I'm hoping for some help in tracking down a power loss / limp mode issue that also seems connected to the ABS system.
A couple of days ago, the "Anti-Skid Service Required" message appeared again. Since buying the car in March, I've seen this message pop up a few times. It’s never affected the car’s performance, so it’s been on the “get to it when I can” list, almost like an old friend checking in. The other night, just as I was arriving home, the anti-skid message appeared again. I parked the car as usual and thought nothing of it. However, the next day, as soon as I reached the speed where second gear would typically engage, the power suddenly cut. The car still moved, but I could feel the ABS pump engaging and pulsing through the pedal. I scanned for codes and found a mechanical error related to the front-right sensor. I removed the sensor and noticed signs of wear on the end, likely caused by a rusted and expanding ABS ring. Under the car, I found a large chunk missing from the ring, which made sense as to why the car couldn’t accurately detect the wheel’s rotation, potentially leading to the power loss and ABS fit. Today, I replaced the ABS ring and sensor (using mid-range parts from Auto Doc, not eBay). After fitting them, I took the car for a test drive but still have the same issue, despite no DTC codes or warning lights (I have a Topdon scanner). After reading up a bit more, I learned the Yaw sensor might be involved, especially if it’s been exposed to moisture. As my car has a sunroof I removed the Yaw sensor to check, but the area was bone dry, with no corrosion on the connectors. I also checked the turbo boost hoses for any leaks to rule that out as the cause of power loss. Next, I decided to pull ABS Fuses 1 & 2 from under the hood to isolate the ABS system. As expected, I got a brake failure message, but surprisingly, the car had full power restored and felt more responsive than usual. I've also had a pull to the right under braking (same side as the sensor and ABS ring I replaced today) since buying the car, but with the ABS fuses pulled, this was hardly noticeable on my test drive. After a 20-minute run, I reinstalled the ABS fuses and tried again. Immediately, the car went back into power loss / limp mode with the ABS pump activating, and for the first time, the yellow traction warning light (bottom right) was flickering. A scan then returned two new codes: 940F Brake Pedal Sensor A01F Vehicle Speed Signal (VSS) This is the first time I’ve seen these codes. I’ve done some searching but can’t find much information on whether these codes might be connected to the issue I’m experiencing. Has anyone dealt with something similar or could point me in the right direction? I’m hesitant to replace parts based solely on codes since I know they don’t always identify the root cause. Thanks in advance for any guidance! |
Oct 28th, 2024, 22:05 | #2 |
Junior Member
Last Online: Today 18:57
Join Date: Aug 2024
Location: newtownabbey
|
I was experiencing pulsing and the car pulling to one side under braking. Changing front discs and pads cured it. I did the rears later.
I'm still getting brake pedal sensor error codes and traction warnings in dash. The pedal sensor is easily accessible under the bonnet - stuck to the brake booster. I'm going to replace mine. As per this video except ours is on the other side and you don't need to remove the strut brace thingy. https://youtu.be/PTeH-H5VAYA?si=7a4HyTZQi58S1c6K |
The Following User Says Thank You to SteveDuNord For This Useful Post: |
Oct 28th, 2024, 22:45 | #3 | |
Premier Member
Last Online: Today 20:45
Join Date: Jun 2009
Location: Devon
|
Quote:
I perceive that when dealing with sensors, no Volvo OE can sometimes cause problems. |
|
Oct 30th, 2024, 21:43 | #4 |
Member
Last Online: Today 17:37
Join Date: Apr 2011
Location: Chichester
|
I had exactly the same problems on my 55 plate. My indie immediately diagnosed a faulty CEM and this was indeed the problem.
He sorted it out with Lukasz at Volvo Diagnostic so you could go to him directly I’m sure. |
Oct 30th, 2024, 23:31 | #5 | |
New Member
Last Online: Nov 3rd, 2024 20:27
Join Date: Oct 2024
Location: Southampton
|
Quote:
|
|
Oct 30th, 2024, 23:32 | #6 |
New Member
Last Online: Nov 3rd, 2024 20:27
Join Date: Oct 2024
Location: Southampton
|
Thats an Idea, I dont hold up hope as I had the issue before I fitted the new ABS Sensor. but it Can't hurt to try.
|
Oct 30th, 2024, 23:36 | #7 |
New Member
Last Online: Nov 3rd, 2024 20:27
Join Date: Oct 2024
Location: Southampton
|
Thanks for that. The CEM was a suspect since I read it’s the main connection between most of the modules. So far, I’ve found that the gearbox isn’t receiving a signal from the BCM, even though the BCM passes the scan check with no errors. The fact that you mentioned having the same issue, and that the CEM was at fault, makes it seem like the most plausible thing to check next.
|
Nov 3rd, 2024, 14:22 | #8 |
New Member
Last Online: Nov 3rd, 2024 20:27
Join Date: Oct 2024
Location: Southampton
|
Update
I decided to bite the bullet and pull out the CEM this weekend to check for any signs of water damage. I’m pleased to report that all connectors were clean and dry, with no sign of water ingress. While I had the unit out, I also took the opportunity to clean the pins.
After reassembly, I’m still facing the same issue: power loss above 5 mph, the ABS pump activating, and the traction control light flashing. However, there are no DTCs or error messages on the display. I recently discovered my Top-Don has live data monitoring, so I checked the BCM while trying to drive the car. The first thing I noticed is that all wheels register a speed of 0.68 km/h when the car is stationary. Once I start moving, as soon as the car reaches about 10 km/h, all wheel speed sensor values shift to "N/A" until the car slows down again. I also noted that the new ABS sensor I fitted lags significantly compared to the other three wheel sensors. Still scratching my head here, with no clear idea of where to go next! |
Nov 3rd, 2024, 14:23 | #9 |
New Member
Last Online: Nov 3rd, 2024 20:27
Join Date: Oct 2024
Location: Southampton
|
Would you be able to send the the contact deatails for the Indepentant you used? Many thanks.
|
Nov 3rd, 2024, 15:40 | #10 | |
Premier Member
Last Online: Today 20:45
Join Date: Jun 2009
Location: Devon
|
Quote:
|
|
Tags |
abs, anti skid, brake issue, power loss, xc90 |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Display Modes | |
|
|