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ABS Control Unit Problems S80

posted by Notatech on Thu Apr 5 00:47 CST 2007
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last visit: Mon May 21 07:16 CST 2007

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HELP!!! Dashboard ABS, Tracs and Check Engine lights are on. I have had my ABS Control Unit repaired and a second ABS Control Unit installed. The dashboard still lights up. After repairing my original ABS Control Unit and still having the same problem, I took the car to the local Volvo Dealership for further testing. They say the error code is 0021 indicating a problem with the right front wheel sensor. They also said that they tested all the wheel sensors and found them to be okay. The dealership maintains that the ABS Control Unit needs replacing (it's an internal fault in the Control Unit). They want to put a new Control Unit in now to see if it fixes the problem. That's a $1000 charge. Is there any other way to determine what's really going on??

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ABS Control Unit Problems S80

posted by KlausC on Thu Apr 5 04:41 CST 2007
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last visit: Fri Oct 24 10:15 CST 2014

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I am confused! You had your original ABS control unit repaired and then put in a new one? The dealer says that the right front sensor is a problem, but further testing shows no problem with it? And now the dealer wants to install a 3rd control module????
Get over to Autozone and get the codes from the computer yourself. Write them all down and look them up. Have them clear the codes, and then check again.

Klaus
--
1975 164 w/174,800mi (Sold) 1995 850T w/91,000mi, 1998 V70R w/129,000mi

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ABS Control Unit Problems S80

posted by Notatech on Thu Apr 5 05:26 CST 2007
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last visit: Mon May 21 07:16 CST 2007

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Klaus -

ABS, Tracs and Check Engine lights came on. Pulled my original control unit out and sent it for an upgrade.

Reinstalled the upgraded control unit. Same lights came on. Had mechanic check wheel sensors with ohm meter - no problems. Had dealership check. Dealership also found no problem with wheel sensors. Read code as 0021 on vadis system (problem with right front wheel sensor). Dealership maintains this is an internal fault in the abs control unit.

Removed upgraded original control unit and swapped it with a second upgraded control unit. Same lights came on. (kinda sounds like the control unit is okay doesn't it??).

Went back to the dealership for their take. They want to swap the second upgraded unit with their new one and go from there. Already paid this dealership once for diagnostics. Don't know why they didn't find the problem the first time. I think it's something else besides the abs control unit, but what??

Thanks for your help.

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ABS Control Unit Problems S80

posted by Notatech on Sun Apr 8 14:25 CST 2007
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last visit: Mon May 21 07:16 CST 2007

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Klaus -

Had Autozone read the obd code - P1550 (translates to ECM-510F; check engine light comes on and a message sent to the ECM if a fault in the vehicle speed signal has been detected in the ABS control module). Still sounds like a wheel sensor or wiring problem to me.

One other thing, when Victor put my original ABS Control Unit in one of his S80s, it worked fine. I opted to have him upgrade my unit anyways to avoid a future problem, but still had the same problemswhen I reinstalled the unit.

Thanks again.

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ABS Control Unit Problems S80

posted by Dave Spriggs on Thu Apr 5 02:58 CST 2007
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last visit: Mon Sep 7 07:15 CST 2009

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STEP ONE: DO NOT let the dealer touch your ABS Unit.

STEP TWO: At the top of the AWD Forum page, type in "ROCHA" in the space next to the text "Try The Improved Search". This will bring up about 280 messages about Victor Rocha and his ABS unit repair program. Legions of Bricksters have sung his praises; read all about it.

STEP THREE: If Step Two is too much reading, visit Victor's web site:

http://home.earthlink.net/~vicrocha/

In a nutshell ... remove and send your ABS to Victor. He will test it. If it has no problems, he will return it to you, and you only pay the postage. If it has failed, he will repair it to a higher quality than an OEM unit right out of the box. Total cost to you: about $140 (includes postage).

Good Luck. Let us know how it goes.
--
Dave in Virginia; 1998 V70 T5(M): IPD MOTRONIC+ ECU Upgrade, Sport Muffler, IPD Strut Tower Brace, VDO Boost Gauge, IPD Anti-Sway Bars, Koni FSD Struts and Shocks, Rocha ABS Control Unit/// 1988 245 DL Wagon// 1967 MGB Roadster

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ABS Control Unit Problems S80

posted by Notatech on Mon May 21 07:26 CST 2007
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last visit: Mon May 21 07:16 CST 2007

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Dave, Klaus & Derf -

Just thought you'd like to know the the problem turned out to be a faulty right front wheel sensor. I had it replaced and everything is working ok for now. In the process I also had Victor Rocha upgrade my ABS Control Unit. He is every bit as good as evryone says he is. Thanks for all your help and advice.

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ABS Control Unit Problems S80

posted by Dave Spriggs on Thu May 24 10:47 CST 2007
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last visit: Mon Sep 7 07:15 CST 2009

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Now, if we could just find a guy who rebuilds driver side master window control switches as quickly and inexpensively as Victor does ABS controllers.

I pulled mine yesterday, opened it, cleaned out the debris, and cleaned the all the contacts. Still didn't work ... and the window was DOWN. So, off to the dealer, and I plunked down about $160 for a new one. For $160 I figured that gave me the right to rant for a minute, so I opined loudly about Volvo's masterpiece of really dumb engineering. If they had set out to design a device which would trap cat and dog hair, fingernails, dead skin, lint, coffee, soda, and rain ... any or all of which can destroy the switch ... they could not have done a better job.

Ahhhh .... but the Archives are full of such rants already.
--
Dave in Virginia; 1998 V70 T5(M): IPD MOTRONIC+ ECU Upgrade, Sport Muffler, IPD Strut Tower Brace; VDO Boost Gauge, IPD Anti-Sway Bars, Rocha ABS Control Unit/// 1988 245 DL Wagon// 1967 MGB Roadster

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ABS Control Unit Problems S80

posted by someone claiming to be Derf on Mon Apr 16 07:44 CST 2007 [RELATED]

Has anyone inspected/tested the wiring on the suspect wheel speed sensors? If the sensor is truly OK, and the ABS Control Unit is OK, the wiring would be my next logical place to check.

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ABS Control Unit Problems S80

posted by Notatech on Thu Apr 5 04:35 CST 2007
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last visit: Mon May 21 07:16 CST 2007

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Dave -

You're right. Victor Rocha is every bit as good as you say. If fact he upgraded my original abs control unit and sent me a replacement, when the upgraded original one caused the same dashboard lights/error. Problem is the replacement shows the same symptoms. Both the volvo dealership and my mechanic have tested the wheel sensors and have not found a problem. The dealership wants to put a brand new abs control unit in the car to see if if fixes the problem. I suspect that something else is causing the dashboard to light up - probably a much simpler problem - and I am about to get hosed by the dealership. I'm trying to find out if anyone else has experienced a similar problem and what the ultimate solution was. Then maybe I can avoid the dealership altogether.

Victor has gone above and beyond as far as I am concerned. He continues to offer suggestions and help and I would recommend him to any volvo owner experiencing abs problems. Trouble is, he is on the west coast and I am on the east, so I can't drive down the block to his establishment to get an honest assessment of my abs trouble.

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