Question about 1997 Volvo 850

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Tacometer stopped working, now the speedometer does not work and the abs light is on and the tracs off as well. The gear shift will not work without pushing the override button.

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  • 173 Answers

This could be due to the carbon brushes in the alternator, which may need replacing.
You should be able to see quite quickly, by removing the couple of screws which hold the small housing, on the back of the alternator.
Good luck with that.

Posted on Jul 22, 2009

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My 99' volvo v70 continually flashes the traction control and abs warning light and the speedometer stops working the trip meter and the odometer go blank than all of a sudden it will start working again...


Sounds like a bad ABS control module is at least part of your problem. The symptoms are usually and ABS and TRACS light intermittent or constand and eventually your speedometer works intermittently or totally quits. This guy rebuilds/upgrades them for about $140. New ones run over $800. http://home.earthlink.net/~vicrocha/Volvo_Parts/Volvo_ABS_removal.htm

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I had the same problem with ABS light and speedometer, I was told that it is the transmission control module. It has not yet stopped shifting but I have had times where it just wont stay running. It will start and then stall. Hope this helps.

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The transmission wont shift out of 2nd gear again.


i can answer part of your question. the front wheel speed sensors are for abs and trac control only. these will not affect the speedo your problem is some where else. sorry i have not had this prob yet good luck. you could have to replace the rear wheel speed sensor again. they are not that good. and after market are even worse.

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