Question about 1999 Volvo S80

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At various times all the warning lights go on/off

There is nothing mechanically wrong with car...it's drives/handles fine. However, intermittently, the warning lights come on. We've seen check engine, brake failure, ABS/Brakes/STC, transmission. etc. When we stop to determine what's wrong...nothing. Car runs fine. Took it to a mechanic and it cost almost $2k for draining transmission & replacing fluid. This did NOT stop the problem. He then said he'd put in a new transmission...I don't think so...nothing wrong w/this one.
What can be causing the warnings to keep appearing intermittently????

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  • Anonymous Jul 18, 2008

    99 S80 T6 For the past few days I've been getting on and off the"Brake Failure Stop ASAP" message along with BRAKE and the STC symbol I guess & a yellow triangle with the exclamation mark.

    At times my cars doesn't want to start.I remember I drove me car for about 3 to miles with the hand brake on. Could that have damage something? Because I think I started to get all these codes after that.

  • Anonymous Jul 23, 2008

    abs brain at fault.

    apparently, these circuit boards are put together by low paid workers. the solder quality is poor therefore you need to open the box with a junior hacksaw carefully, prize it apart and re solder the joints on the inside of where the connector pins are joined to the circuit board.

    problem solved.

    if you decide to get a new one and pay loads of £££££`s i can guarantee the same thing will happen again with a new one, again because of the poor quality of workmanship.

    if you are not confident with doing this yourself, then there are places you can send it to. i think in the u.s. there is a bloke called victor? do a search on www.matthewsvolvochar.com or a similar forum with a google search and find more info there.

    goog luck

    les northeast uk

  • okanivolvo Dec 15, 2008

    With all the same lights on car didn't start once, then it started but with different warning message complaining on transmission, but I was able to drive the car for 2 days in a row, now again all lights back and car won't start. Will take it tomorrow to electricians since there is no help from mechanics. Don't want to go to dealership. I'll explain to them what it can be from this posts, hopefully it is just a contacts issue. I'll keep you posted.

  • ch_aravena May 11, 2010

    I have the same problem on Volvo S80, year 2000, engine B5244S. The Brake, ABS and STC/DSTC lights go on/off intermitently. The brake system was checked and nothing wrong. The message on display says: Stop Inmediatly; few seconds before, the lights go off and message disappear.

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I HAD THE SAME EXACT PROBLEM WITH MY CAR. IT HAS BEEN AT THE DEALER FOR 2 MONTHS UNTIL THEY FIGURED OUT WHAT HAPPENED. WHAT WAS WRONG WITH IT WAS THE MAIN CONNECTOR THAT CONNECT THE COMPUTER AND ALL THE MODULES. iT WAS FILLED UP WITH SODA THAT I HAVE SPILLED INSIDE A CAN COUPLE OFTIMES WHICH CAUSED A ELECTRICAL BREAKOUT AND ALL THOSE WARNINGS POPPING UP AS WELL AS LIGHT BULBS MULTIPLE FAILURE AND ALL SORT OF ELECTRICAL ISSUES.

Posted on Oct 20, 2008

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Abs circuit board normally also can cause no speedo /1st you need to have volvo read the code and give you a print out or just throw money out the car window? generic scan tools are very limited on codes and history

Posted on Aug 26, 2008

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SOURCE: at various times all the warning lights go on/off

transmisson replacement is necessary.
thanks.

Posted on Sep 18, 2008

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